36 



TUNICATA. 



Cynthia (Sav.). Body sessile; test leathery; 

 branchial sac folded lengtliwise : both orifices 

 four-sided. 



C. microcosmus. C. morus. 



claudicans. rustica. 



tuberosa. grossiilaria. 

 quadrangiilaris. Fig. bQ ; n. s. ampulla, 



informis. mammillaris. 



tesselata. aggregata. 

 limacina. 



55 



56 



Family IY. Pelon^ad^. 



Feloncea (Forbes). Test cylindrical, unattached ; 

 orifices without rays, on two equal approximate 

 warty eminences at the fore extremity. 



P. corrugata. Fig. 57. 

 glabra. 



Family Y. Salpad^. 



Sal'pa (Gmel.). Test and mantle cylindrical or 

 oval, open at both extremities ; anal orifice wide, 

 transverse, and furnished with a valve; swims 

 freely in the ocean. 



S. runcinata. Fig. 58 ; n. s. 



