1887.] NATURAL SCIENCES OF PHILADELPHIA. 305 



hat man Korotneff 's AufFassung nicht zustimmen konnen, und es 

 ware in der That eine nochmalige Nachpriifung von dessen Mittheil- 

 ungen wiinschenswerth, bevor man das eigenthiimliche Verhalten 

 der Tuuikaten beim physiologischen Processe der Erniihrung zu der 

 Schlussfolgerung der ich aber aus anderen Griiudeu volkommen 

 beipflichte verwendet "deswegeu haben wir in unserem Falle 

 Ursache, noch an der hohen genetischen Stellung zu zweifeln, die 

 den Tunikaten zugeschrieben ist." 



At the beginning of the intestine proper the cells composing the 

 walls resume the appearance of those of the oesophagus and again 

 cilia show themselves. 



The presence of cilia for moving on the intestinal contents is nec- 

 essary on account of the lack of any musculature in connection with 

 the visceral nucleus. Thei*e is present under all the cells of this 

 tract a delicate basement membrane in which nuclei may occasion- 

 ally be seen. Spreading over the visceral nucleus is a net-work of 

 delicate tubes; the "darmumspinnende Driise" of Seeliger and 

 others. 



These consist of an extremely tliin basement membrane bearing 

 cuboidal cells of a pale transparent character in which there was no 

 nucleus visible. In no place could I detect cilia in these tubules as 

 described by Chandeleon^ for Perophora, but I did find numerous 

 large concretion-like masses of a dark-brown color. Seeliger believ- 

 ing these glandular tubules to be hepatic in function might perhaps 

 consider the above dark-brown masses as biliary secretion. 



The disadvantage of having no living specimens to examine is ap- 

 parent when I say I can not find the plasma off-shoots from the 

 stomach cells into the lumen of the same, nor the glandular cells, 

 containing yellow drops, seen by Seeliger in the stomach walls of 

 living specimens. 



Filling up the cavity produced by the doubling of the intestine, 

 and by the two coecal appendages, lie the Testes which consists of a 

 number of delicate tubes in which a basement membrane is scarcely 

 apparent; and a layer of clear round cells containing pear-shaped 

 nuclei, form the walls. I could not find the "spindle-shaped nu- 

 cleated cells forming a sort of connective tissue about the gland as 

 described by Leuckart.^ 



The Heart lies in a pericardium which appears to be but a sac 



^ Th. Chandeleon : Recherches sur une annexer du tube digestif des Tu- 

 niciers in Bull de I'Acad. Roy. de Belgique. 44me Aniiee. 2e Ser. T. XXXIX, p. 

 911, 187.-). 



^ i.e. p 36. 



