Archive image from page 471 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 SECRETION. and biliary organs are so intimately connected in this genus, that it is not easy to point out Fig. 316. Biliary apparatus of Eolis. A, branchial papilla of E. papillnsa, exhibiting the gland b and the duct c; also an ovate vesicle, a, apparently an organ of defence, and at d the wall of the inner sheath; B, branchial papilla of E. Farrani, showing the same parts, (After Alder and Hancock.) the limits of each ; they appear to differ in differen
Archive image from page 471 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 SECRETION. and biliary organs are so intimately connected in this genus, that it is not easy to point out Fig. 316. Biliary apparatus of Eolis. A, branchial papilla of E. papillnsa, exhibiting the gland b and the duct c; also an ovate vesicle, a, apparently an organ of defence, and at d the wall of the inner sheath; B, branchial papilla of E. Farrani, showing the same parts, (After Alder and Hancock.) the limits of each ; they appear to differ in different species. In E. papi/losa, the central canal is evidently a continuation of the sto- mach, and the plicated internal membrane is not only continuous throughout it, but also passes into the lateral branches, which thus appear to form part of the same organ. On the ether hand, we find in some species coloured granules, similar to those of the papillae, partially lining the ramifications, as in and others ; while in E. dcspecta, the central canal, all the ramifications, and the glands of the papillae, are coloured and gra- nulated alike, implying a greater diffusion of the biliary function. The food, after being partially digested in the stomachal pouch, is driven in detached portions through the alimentary system, by the alternate contrac- tions of the pouch and great trunks leading from it ; these contractions are only of a nature to produce an oscillatory motion, which serves to promote that intimate mixture of the alimentary matters with the hepatic and other secretions, necessary to the process of digestion/' The intimate structure of the liver of Ver- Alder and Hancock's Nudibranchiate Mollusca, Fart i;i. tcbrated animals is much more difficult of elucidation, and can scarcely be said to be yet satisfactorily determined. The organ presents more and more, as we ascend the series, a solid parenchymatous texture, which strikingly contrasts with its loosely tabula
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