on the Natural Group o/Tunicata. 555 



part of the cavity of the animal. The rectum is seen 

 ascending towards the anal orifice, and is terminated by 

 a simply-margined anus. The pharynx is a much smaller 

 aperture than the anus, and communicates with a narrow 

 curved oesophagus. The parts are nearly in situ. 



C. Top thrown back, with internal view of branchial 



orifice. 

 k. Part of the branched and unique ovary, which 



answers to the left ovary of Cynthia. 

 A. Anal orifice. 

 E. Fragment of envelope. 

 R. Ascending rectum. 

 H. Anus. 



N. Nervous tubercle, which appears to have been cut 

 through on opening the animal. 

 Fig. 6. Sketch to show the manner in which the anus of Den- 

 drodoa glandaria is kept suspended by a muscle attached 

 to the side of the mantle. 



N. B. In the foregoing explanation of the plates I have chosen 

 the same letters to denote several organs, that are used to denote 

 those organs in the valuable plates of M. Savigny. 



VOL. XIV. 



4 c XXVI. A Be- 



