The origin of marine invertebrate larvae has been an area of controversy in developmental evolution for over a century. Here, we address the question of whether a pelagic “larval” or benthic “adult” morphology originated first in metazoan lineages by testing the hypothesis that particular gene co-option patterns will be associated with the origin of feeding, indirect developing larval forms. Empirical evidence bearing on this hypothesis is derivable from gene expression studies of the sea urchin larval gut of two closely related (...) but differently developing congenerics, Heliocidaris tuberculata (feeding indirect-developing larva) and H. erythrogramma (nonfeeding direct developer), given two subsidiary hypotheses. (1) If larval gut gene expression in H. tuberculata was co-opted from an ancestral adult expression pattern, then the gut expression pattern will remain in adult H. erythrogramma despite its direct development. (2) Genes expressed in the larval gut of H. tuberculata will not have a coordinated expression pattern in H. erythrogramma larvae due to loss of a functional gut. Five structural genes expressed in the invaginating archenteron of H. tuberculata during gastrulation exhibit substantially different expression patterns in H. erythrogramma with only one remaining endoderm specific. Expression of these genes in the adult of H. erythrogramma and larval gut of H. tuberculata, but not in H. erythrogramma larval endoderm, supports the hypothesis that they first played roles in the formation of adult structures and were subsequently recruited into larval ontogeny during the origin and evolution of feeding planktotrophic deuterostome larvae. (shrink)

Alison Denham examines the ways in which our engagement with literary art, and metaphorical discourse in particular, informs our moral beliefs. She considers to what extent moral and metaphorical discourses are capable of truth or falsehood, warrant or justification, and how it is that we understand these discourses. This vital new study offers a fresh view of the nature of the moral and the metaphorical, and the relations between art and morality.

Believing that there is still something to be said about the early history of clausulae in Latin prose, I set myself to trace the practice of the early orators, then that of the Rhetorica ad Herennium, accepting its conventional dating to 86–82 B.C., and lastly that of Cicero in De Inventione, assuming it to be roughly contemporary with the ad Herennium, and in his early speeches. But clausula-study itself, besides shedding light on the methods of composition used by the still (...) unidentifiable Auctor ad Herennium, cast doubts on the conventional dating of his work. I gave a brief outline of my conclusions in C.R., N.S. vi , 134–6.1 propose to attempt here a detailed justification of those relating to the date of the work, with a few modifications of some points. (shrink)

So far his weapons of defence are taken from a common armoury; but in the next verses he develops the argumentum ad hominem which was foreshadowed in ‘eques’ and ‘intra fortunam qui cupis esse tuam.’ Such promptings, says he, come strangely from Maecenas, whose own discreetness and self-repression will be famous in history, and whom he is resolved, so far as in him lies, to imitate.

Both the author and the date of this five-volume poem, the first Western document to link the houses of the zodiac with the course of human affairs, are uncertain. The author's name may be Marcus Manilius, or Manlius, or Mallius, and the latest datable event mentioned in the books themselves is the disastrous defeat of Varus' Roman legions by the German tribes in 9 CE. The writing shows knowledge of the work of Lucretius, but the work is not referred to (...) by any subsequent writer, suggesting that it was never widely disseminated. A manuscript was rediscovered by Poggio Bracciolini in 1416 or 1417, and a version was published by the astronomer Regiomontanus in 1473. Editions were later produced by Scaliger and Bentley, but this immensely erudite edition of 1903–30 by the scholar and poet A. E. Housman is regarded as authoritative. (shrink)

Both the author and the date of this five-volume poem, the first Western document to link the houses of the zodiac with the course of human affairs, are uncertain. The author's name may be Marcus Manilius, or Manlius, or Mallius, and the latest datable event mentioned in the books themselves is the disastrous defeat of Varus' Roman legions by the German tribes in 9 CE. The writing shows knowledge of the work of Lucretius, but the work is not referred to (...) by any subsequent writer, suggesting that it was never widely disseminated. A manuscript was rediscovered by Poggio Bracciolini in 1416 or 1417, and editions were produced by Scaliger and Bentley, but this immensely erudite edition of 1903–1930 by the scholar and poet A. E. Housman is regarded as authoritative. Volume 4 describes the influence of the zodiacal signs on the people born under them. (shrink)

Both the author and the date of this five-volume poem, the first Western document to link the houses of the zodiac with the course of human affairs, are uncertain. The author's name may be Marcus Manilius, or Manlius, or Mallius, and the latest datable event mentioned in the books themselves is the disastrous defeat of Varus' Roman legions by the German tribes in 9 CE. The writing shows knowledge of the work of Lucretius, but the work is not referred to (...) by any subsequent writer, suggesting that it was never widely disseminated. A manuscript was rediscovered by Poggio Bracciolini in 1416 or 1417, and editions were produced by Scaliger and Bentley, but this immensely erudite edition of 1903–1930 by the scholar and poet A. E. Housman is regarded as authoritative. Volume 3 describes the working out of horoscopes. (shrink)

(No abstract is available for this citation).