222 THE ROYAL SOCIETY OF CANADA 



ECTORCHIS gen. nov. 



Syn. Molgula et Caesira auct. (partim). 



(éKTÔs and opxts, in allusion to the external position of the male 



part of the gonad) 



Pharynx with 5 folds on each side. Infundibula extending into 

 folds, each having many stigmata spirally arranged. Dorsal lamina 

 with smooth margin. Dorsal tubercle with aperture horseshoe shaped, 

 the horns inrolled, and the opening between directed forwards. 



A gonad on each side, the left placed across the intestinal loop on 

 its inner side. Testicular lobes in a large flat mass against mantle 

 and (on left side) intestinal loop, and outside blind end of ovary. 

 Vas deferens attached to mantle and passing along and beyond open 

 or atrial end of ovary. 



Type and single species — E. hupferi (Michaelsen). 



The systematic position of this form is doubtful. In the relations 

 of the testis and vas deferens (on the outer side of the ovary) it 

 resembles Paramolgula. The relation of the gonad to the intestine 

 is similar to that in some species of Eugyra, and the stalk with special 

 muscles resembles the "root" of Rhizomolgula. 



EUGYRIOIDES Seeliger 



Pharynx with from 5 to 7 longitudinal bars on each side in place 

 of folds. Infundibula in rows corresponding to the bars, each con- 

 sisting of two long spirally coiled stigmata. Dorsal lamina with 

 smooth margin. Dorsal tubercle a simple opening. 



A gonad on each side, the left in the intestinal loop. Testicular 

 lobes bordering and more or less enclosing ovary. Several vasa 

 deferentia not accompanying oviduct. 



Type species — *E. gliUinans (Moller). Another species is E. 

 schmidti Redikorzew (1914, p. 42). E. guttula (Michaelsen), E. mol- 

 gidoides (Sluiter), and E. symetrica (Drasche) have been assigned to 

 this genus, but the structure of the gonads is not sufficiently known 

 for their systematic position to be determined. Paramolgula arctica 

 Bonne vie has also been placed in this genus, but the author states 

 that the left gonad is in front of the intestinal loop, which would 

 make it necessary to place it elsewhere. It cannot be accurately 

 assigned until the structure of its gonads is known. 



