Excerpt from Bulletin of the Essex Institute, Vol. 21: Jan., Feb., March, 1889 Genera Theridion, Pholcus, Drassus and Lycosa, - a paper the points of which appear to fully support the views which were advanced in the discussion. In brief, according to Morin, the nucleus of segmentation in the eggs studied by him lies at the centre of the egg and not until the third seg mentation does the yolk segment. The segmentation is perfectly regular and not until the one hundred and twen ty-eight-cell stage is reached, do the nuclei and surround ing protoplasm reach the surface and form the blastoderm, at which time they separate from the yolk pyramids, which now again forms an unnucleated homogeneous mass. The blastoderm now thickens upon the ventral surface, and from its centre cells are budded inwards, some of which re main between the parent cells and the yolk, while others sink into the yolk itself. As will readily be seen this pro cess, which gives rise to both meso and entoderm, is easily brought into full accord with the gastrulation in Crangon, and other types. Morin does not regard the primitive cumulus as of importance in the formation of the germ layers, since, in his experience, it does not arise until after they are formed; indeed it does not appear at any stage in Theridion. The entoderm nuclei sink into the yolk where they remain distinct - much as I have described them in Limulus p. 530, figs. 45 and 47) -until shortly be fore hatching. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.