304 Account of Professor Ehrenherg's 



In the Campyhcoda the canal is serpentine, with two separate 

 orifices, which are seldom placed opposite to each other in the 

 .axis of the body (Fig. 10). This circumstance will generally 

 serve to distinguish the Campyhcoda^ which have, moreover, a 

 certain want of regularity in their external form. It is difficult 

 to trace the course of the canal itself. 



V. — On Glands and other Appendages of the Alimentary Canal in 

 the Rotatoria. 



In his former memoirs, Dr Ehrenberg took notice of two 

 glandular bodies attached to the oesophagus in some of the ro- 

 tatoria, which he considered analogous to the pancreas of 

 higher animals, and he gave a particular description and repre- 

 sentation of them, as they are seen in the Hydatina senta. He 

 has subsequently found them in all the rotatoria which he has 

 examined, except the genera Ichthydium and Chcetonotus. 

 Having frequently observed these organs to be muc4i smaller in 

 those animals which had laid a considerable number of eggs, 

 and which were therefore older, he imagined that they might be 

 testicles ; but not being able to trace any anatomical connection 

 between them and the generative apparatus, he is still inclined 

 to his former opinion, that they are glands subservient to the 

 process of digestion. 



Besides these pancreas-like bodies, he has in certain species 

 discovered organs resembling biliary vessels, and in others coe- 

 cal appendages connected with the alimentary canal. In the 

 Enteroplea Hydatina, several deHcate vessels are connected with 

 a dilated portion of the oesophagus not far from the stomach, 

 (Fig. 4). They are transparent and colourless, but in other re- 

 spects bear much resemblance to the biliary vessels of insects. 

 The ccecal appendages are found in several species ; in the Me- 

 galotrocha alba they are two in number, short, and situated near 

 the bottom of the stomach. In the Notommata clavulata, there 

 are four, which are long and filiform, equalling in length the 

 elongated pancreas, and are attached to th^ middle of the sto- 

 mach. In Diglena lacustris (Fig. 5), they are also long and 

 filiform, and are connected with the middle of the stomach ; 

 they are in some instances four in number, in others five. 

 These cceca are all transparent ; their function is still doubtful. 



