on the Natural Group of 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 cesophagus. The parts are nearly in situ. 
C. 
k. 
Zug 
Top thrown back, with internal view of branchial 
orifice. 
Part of the branched and unique ovary, which 
answers to the left ovary of Cynthia. 
Anal orifice. | 
Fragment of envelope. 
Ascending rectum. 
Anus. 
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. 
4c XXVI. A De- 
