Book Description

Excerpt from A Monograph of the Free and Semi-Parasitic Copepoda of the British Islands, Vol. 2 Second pair sometimes foot-like, but mostly forming a strong prehensile uncinate hand. First pair of feet mostly (though not always) different from the following pairs and converted into a prehensile apparatus; second, third, and fourth pairs adapted for swimming; fifth pair 2-jointed, foliaceous; different in the two sexes, the basal joint usually dilated and more or less embracing the smaller apical joint. Eyes as in Cyclops. Heart wanting. Copulative organs in the female symmetrical, in the male usually asymmetrical. Ovisac in most cases single, rarely double. This family, according to the arrangement here adopted, contains thirty-three genera and eighty-one species, and is therefore by far the largest of the nine families coming within the range of the present Monograph. The limits of the family are precisely those adopted by Claus and Boeck, except that the group erected by the former author into a separate family under the name Peltidid are here (as also by Boeck) included amongst the Harpacticid . There is, in fact, no important structural difference between the two, the point relied on by Claus as distinctive being the flattened form of the Peltidid, which is of no great importance in itself, and is found in certain species of some genrea (e.g. Thalestris), the normal form of which is cylindrical. 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."