124 



PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



soft glands. No such structure occurs in pyrenaica or pellucida, 

 the former having the strange organ (Fig. 1 b, x) opening into the 

 oviduct at about the same level as the penis, while in the latter the 

 genitalia are without either sort of accessory organ. In pellucida 

 (Fig. 1 a) the duct of the spermatheca joins the oviduct immediately- 

 above the entrance of the penis, in pyrenaica the junction is a good 

 deal (about 1 mm.), and in the new species (Fig. 1 c) much (about 

 2^ mm.) higher up. In pellucida the terminal part of the vas deferens 



Pig.l 



V. pellucida 



V. pyrenaica 

 (hlberalca) 



1mm. 

 P ■ penia S > epermatheca ■> oviduct 



V. major (?) 



Pig. 3 

 maj or (Ardennes) "^J "r (Cusop) 



Fig. 2 

 major CArdenne^ maJor(CuBO]^ 



pyrenaica (IrelandJ pellucida CCuso; 



pyrenaica (Ireland) pellucida (Cusop) 



is rather firmly bound to the penis by a connective tissue sheath, 

 but the two are easily separated by dissection ; in the new form, 

 as in pyrenaica, the vas disappears from view near the base of the 

 penis, but microscopical sections show in both cases that it runs 

 up in the wall of the penis, and is continuous with the lumen of 

 that organ only at the apex. 



The radula of the new form is of the same general type as in 

 pyrenaica, and is easily distinguished from that of pellucida by the 



