36 



TUNIGATA. 



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

 branchial sac folded lengthwise : both orifices 

 four-sided. 



C. microcosmus. 

 claudicans. 

 tuberosa. 



quadrangularis. Fig. 56 ; 

 informis. 

 tesselata. 

 limacina. 



C. moms. 



rustica. 



grossularia. 

 s. ampulla. 



mammillaris. 



FAMILY IV. 



Peloncea (Forbes). Test cylindrical, unattached ; 

 orifices without rays, on two equal approximate 

 warty eminences at the fore extremity. 



P. corragata. Fig. 57. 

 glabra. 



FAMILY V. SALPAD^E. 



Salpa (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. t Fig. 58 ; n. s. 



