228 THE ROYAL SOCIETY OF CANADA 



Type species — G. ampulloides P. J. Van Beneden. 



Other species are G. euprocta (Drasche), G. manhattensis (DeKay) 

 and G. simplex Hancock. 



Molgula georgiana Michaelsen, M. koreni Traust., M. platei 

 Hartmeyer (1914, p. 8), M. rotunda Oka (1914, p. 448) and Caesira 

 robusta Van Name (1912, p. 505) perhaps belong here. 



This genus has much in common with Molgula, but differs rather 

 distinctly from the latter in having the intestinal loop strongly 

 curved into a secondary loop, which embraces the left gonad, as well 

 as in having a smaller number of pharyngeal folds. The latter 

 character is remarkably constant. In these same characters it 

 approaches the sub-genus Euperiptycha of the genus Euritteria. 



CYSTINGIA MacLeay 



Syn. Pera Stimpson. 



Meristocarpus Pizon 



Molgula et Caesira auct. (partim) 



Pharynx with from 5 to 7 folds on each side. Infundibula ex- 

 tending into folds, each having many short stigmata spirally arranged. 

 Dorsal lamina with smooth margin. Dorsal tubercle horseshoe- 

 shaped, with horns sometimes incurved and coiled: opening between 

 horns directed to right or posteriorly. 



A gonad on each side, the left ovary above the intestinal loop. 

 Testicular lobes irregularly disposed, with from one to many separate 

 testicular systems, partly beside ovary and partly separate from 

 latter, a portion on the left side frequently in the intestinal loop, and 

 on the right side below the renal organ. Vasa deferentia not accom- 

 panying oviduct. 



Type species' — C. griffithsii MacLeay. {Molgula crystallina 

 auct., see Huntsman, 1922). 



In addition to the type species the genus includes C retortiformis 

 (Verrill), and C. redikorzevi Oka, (1914, p. 446). 



PAREUGYRIOIDES Hartmeyer 



Pharynx with 7 longitudinal bars on each side in place of folds. 

 Infundibula in rows corresponding to the bars, each having rather 

 many spirally arranged stigmata. Occasional accessory infundibula. 

 Dorsal lamina with smooth margin. Dorsal tubercle more or less 

 horseshoe-shaped with opening between horns directed to the right. 



