Archive image from page 469 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 Biliary Organs of Artacus affinis. a, crecura of the liver of Cray-fish, with its contained cells ; b, c, d, e, /exhibit the progressive changes of the cells, as they advance from the bottom of the tube. ( After Leidy.) terior half with a mass of fat cells, the nucleus hardly visible, from the property of oil ren- dering organic tissues more or less trans- parent. The central cavity of the caeca is filled with fat globules, and a finely granular matter corre
Archive image from page 469 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 Biliary Organs of Artacus affinis. a, crecura of the liver of Cray-fish, with its contained cells ; b, c, d, e, /exhibit the progressive changes of the cells, as they advance from the bottom of the tube. ( After Leidy.) terior half with a mass of fat cells, the nucleus hardly visible, from the property of oil ren- dering organic tissues more or less trans- parent. The central cavity of the caeca is filled with fat globules, and a finely granular matter corresponding to that in the interior of the cells.' In some of the lower forms of Crustacea, the liver is reduced to the simple condition which it presents in insects ; and there is one very curious group, that of Pyc- nogonidcc, in which the biliary apparatus is as much diffused as in the Radiata. In these animals, the stomach sends caecal prolonga- tions into the legs, and these extend nearly to their terminal claws. The walls, both of the central stomach and of its tubular exten- sions, are studded with brownish-yellow cells; but beyond this there is no rudiment of any organ for the secretion of bile. In the Molluscous animals, the general structure of the liver closely corresponds with that which has just been described in the higher Crustacea. Among the Compound Tunicata, however, to which the Bryozoa are so nearly related that many naturalists asso- ciate them together in one group, the struc- ture of the liver is the same as that of Bower- bankia; the hepatic follicles being isolated from each other, and lodged in the walls of the stomach, into the cavity of which they pour their secretion by separate orifices. In the Solitary Ascidians, the hepatic follicles are more developed, and cluster round the ex- terior of the stomach, so as to give it a shaggy appearance, very much as in the earthworm. In the Conchifera, the liver presents itself as a distinct organ, composed of n
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