230 THE ROYAL SOCIETY OF CANADA 



Intestinal loop sometimes strongly curved into a secondary loop. 

 A gonad on each side, the left above primary intestinal loop and m.ore 

 or less in secondary, when latter is well formed. Testicular lobes 

 arranged radially at blind end of ovary. A single vas deferens, 

 accompanying ovary and oviduct. 



Type species — 6'. tumulus (Quoy et Gaimard) . 



Sub-gen. Syphonotethis 



Type species — S. tumulus (Quoy et Gaimard). 



Infundibula well formed. Stigmata for the most part in rows. 

 Aperture of dorsal tubercle well developed and characteristically 

 bent. 



Vas deferens with straight course along middle of an elongated 

 ovary. 



Other species are 5. godeffroyi (Michaelsen), *S. verrucifera 

 (Ritter and Forsyth, 1917, p. 446) and 6". co?ichata (Sluiter). 



Molgula forbesi Herdman and Astropera sahulosa Pizon should 

 probably be assigned to this group, but they have not been sufificiently 

 described. 



Sub-gen. Callipera nov. {koXKos and Tnjpa) 



Type species — S. pulchra (Michaelsen). 



Infundibula not well developed, but somewhat flattened. Aper- 

 ture of dorsal tubercle from simple to crescent-shaped. 



Vas deferens with tortuous course over inner surface of a short 

 ovary. 



A second species is 5. pyriformis (Herdman). Molgula crinita 

 Sluiter also should probably be placed in this sub-genus. 



CAESIRA Fleming 



Syn. Ctenicella Lacaze-Duthiers (partim) 

 Molgulidium Seeliger (partim) 

 Molgula auct. (partim) 



Apertural lobes fringed or branched. 



Pharynx with seven folds on each side. Infundibula extending 

 into folds, each having many stigmata which are spirally arranged, and 

 at the same time form rows lengthwise of the infundibula. Dorsal 

 lamina more or less toothed. Dorsal tubercle with aperture in the 

 shape of an S reversed, the horns usually turned in and coiled. 



