Identifier: lecturesoncompar02owen (find matches)
Title: Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons
Year: 1855 (1850s)
Authors: Owen, Richard, 1804-1892
Subjects: Invertebrates Anatomy, Comparative
Publisher: London : Longman, Brown, Green & Longmans
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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the body in some Rotiferamust be cited as one of the secretions in that class: the gland issituated at the base of the tail in Lacinularia, and its duct traversesthat extensile part to terminate at its extremity. Many individualsof Conochilus and Lacinularia may be found in a conglomerate ofsuch gelatinous shells, diverging from their fundus as from a centre.The individuals of Tubicularia, Floscularia, and Stephanoceros areprotected in more elongated tube-shaped cells, which are commonlyinsulated. In 3Ielicerta the protective tube is composed of multan-gular brown corpuscles, expelled from the cloacal opening, and com-pacted together.* The Rotifera are of distinct sex; the females being larger thanthe males, and almost exclusively the subjects of scrutiny by theeminent micrographers to whom we are indebted for a knowledge ofthe anatomy of the class. Any other than female organs in theselarger individuals has been ascri^d to them only on the supposition * XXIV. p. 183.E 50 LECTURE in.
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StephaiKiceros Kichonm. that part of the respiratoryor aquigerous apparatus wasthe male organ. Most of theRotifera are oviparous, theova being large and few innumber (fig. 22, «.) : thePhilodince are commonly vi-viparous. No species hasyet been found to be par-thenogenetic, either by wayof spontaneous fission orgemmation. The egg-forming organconsists of a simple widesac, single in Notommaia(fig. 20, /.), but more com-monly divided into two cor-nua, the body terminatingby a short contracted cervix,which communicates with thecloaca. The two other longerand more slender canals con-nected with the cloaca bythe medium of the pulsa-tile sac, which are supposedby Ehrenberg to be thetestes and seminal vesicle,are the parts already de-scribed as the respiratorysystem. In the first placeSiebold has shown, thatin the development of theRotifera, the long and slendertubes appear and increase inthe ratio of the growth of theintestinal organs and beforethe ovaria; secondly, theycontain nothing but

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