MOLLUSCAN GENUS COCHLITOMA. 



257 



.this. The jwostaie invests one side of the spermoviduct over 

 practically its whole length and projects into the lumen of the 

 uterus. The upper end of the latter is much folded, the lower 

 end smooth. 



The vagina is short (22 mm. in both cases) as compared with the 

 long spermoviduct. The spermatheca has a characteristic duct 

 with a broad and stout basal portion narrowing to a short thin 



Text-figure 5. 



CocJilitoma sehra var. obesa. 

 Genitalia. For lettering see text-fig. 9, p. 262. 



section which expands to the long, truncheon-shaped sperma- 

 theca. The duct measures 17 mm. in z^ and is longer in z^. The 

 latter appears not to have attained its full development, so that 

 the spermatheca may grow at the expense of the duct. The 

 common duct of vagina and spermatheca measures 15'5 mm, in 

 z_, and only 8 mm. in z^. 



The vas deferens measures 52 mm. in z., and 37 mm. in z^. 

 It passes to the base of the penis and is inserted into the latter 



