[huntsman] the ASCIDIAN FAMILY CAESIRIDAE 227 



A single gonad, situated on the left side above the primary 

 intestinal loop. Testicular lobes bordering and more or less enclosing 

 ovary. Several vasa deferentia, not accompanying oviduct. 



Type and single species — E. intermedia Roule. 



MOLGULA Forbes (sens, restr.) 



Pharynx with seven folds on each side. Infundibula extending 

 into folds, each having many rather short stigm.ata spirally arranged. 

 Dorsal lamina with smooth margin. Dorsal tubercle with aperture 

 in form of slit, usually bent into the shape of a horseshoe with the 

 horns incoiled. Opening between the horns usually directed pos- 

 teriorly or to the right, but occasionally to the left. 



Intestinal loop not strongly curved into a secondary loop. A 

 gonad on each side, the left above primary, and in secondary loop, 

 when such is formed. Testicular lobes bordering and more or less 

 enclosing ovary. One to many vasa deferentia, not accompanying 

 ovary and oviduct. 



Type species — M. oculata Forbes. 



Other species are: M. pannosa Verrill, M. roscovita (Lac.-Duth.), 

 M. solenota (Lac.-Duth.), M. citrina Aid. and Hanc, M. septentrionalis 

 Traust., M. apoploa (Huntsman, 1913, p. 129). M. hecateia (Hunts- 

 man, 1913, p. 130), M. pugetiensis Herdman, M. pacifica (Huntsman, 

 1913, p. 132), M. hirulai Redikorzew, and M. helleri Drasche. 



M. arctica Kiaer, M. psammodes Traust., M. siphonalis Sars, M. 

 romeri Hartmeyer, M. aidae Oka (1914, p. 453), M. xenophora Oka 

 (1914, p. 457) and M. kophameli Michaelsen probably belong in this 

 genus as restricted in the diagnosis given, but their descriptions are 

 not sufficiently complete. 



GYMNOCYSTIS Giard(sens. nov.) 



Syn. Molgula et Caesira auct. (partim) 



Pharynx with six folds on each side. Infundibula extending into 

 folds, each having many rather short stigmata, spirally arranged. 

 Dorsal lamina with margin smooth (or rarely toothed) . Dorsal tubercle 

 horseshoe-shaped with horns more or less incurved. Opening between 

 horns directed posteriorly or to right. 



Intestinal loop strongly curved into a secondary loop. A gonad 

 on each side, the left above primary, and in secondary intestinal loop. 

 Testicular lobes bordering and more or less enclosing ovary. Several 

 vasa deferentia, not accompanying oviduct. 



