258 



Z. ASCIDIOJUA. 



Fig. 42. 



" It consists of a creeping tube and a number of stems branching- 

 from it, each ending in an animal that is shown (not very distinct- 

 ly) at fig. 42, d. The stems, though commonly still, have free power 

 of motion ; and when one is disturbed it bends quickly to and fro, so 

 as to strike one or two more ; these again strike upon others, and 

 thus for a few seconds all are in action : but they soon return to 

 quietness, and the arms, which during the commotion had been doubled 

 in, open again. (Fig. 42, c.) 



" The arms are placed on the edge of a pi-etty transparent tunic, 

 and have granulations on their back. They are fringed with cilise 

 possessing the same action as those of Ascidiae and Flustrae ; and 

 in the specimen drawn, small substances were occasionally seen car- 

 ried downwards along them. As in Flustra, a part of the intestine 

 had within it a revolution of particles and dark matter round its axis, 

 and this part communicated with an ascending rectum. The arms 

 at the part of the circle opposite to the rectum appeared to be con- 



description of what appears to be the same species in the Cyclop, of Anat. and 

 Physiology, i. 610, fig. 293; for a mere difference in the ramification can scarce- 

 ly be considered specifical in this tribe. 



3 



