53 



THE GENITALIA OF AZECA TRIDENS AND 

 COCHLICOPA LUBRICA. 



By a. E. boycott. 



(Read before the Society, February 14th, 1917). 



There seems to be some doubt about the morphology of the lower 

 genitalia in these two species. I give here a drawing derived from 

 recent observations. Gross dissection has in each case been checked 

 by serial microscopical sections ; the figures have actually been re- 

 constructed from the latter. 



C. luhrica. A. triJcns. 



sp.o., spermovidiict ; g-o., glandular oviduct; c, free oviduct; v.d., vas deferens; 



p., penis; a., appendix to penis; d., diverticulum of oviduct ; c.b., cop\datory branch 



of duct of spermatheca ; s., spermatheca. 



The actual, not the superficial, origin of the vas deferens is indicated. 



I. — Azeca tridens. — The vas deferens is remarkably bulky 

 throughout its course, and the walls muscular even in the 

 descending limb, which runs in relation with the oviduct. 

 The ascending limb is really penile in character, and it is 

 hard to fix any point, unless it be at the bend below, where 



