HAAS: ABIDA AND CHONDRINA. 303 



Names. 



P. jumillensis guiraonis Pils. 



P. jumillensis Pfr. 



P. tarraconensis Fagot. 



It will be seen by this list that combination 5, (a-1-0), cor- 

 responding to C. jumillensis guiraonis Pilsbry, occurs most 

 frequently, 141 out of the 427 specimens investigated having 

 this formula. The combinations 1, (0-0-0), with 80, and 12, 

 (2-1-0), with 82 specimens, are almost as strong in numbers. 



All of the specimens examined, however much they may 

 vary in size, sculpture, number of whorls and dentition, agree 

 in the following characters which differentiate them through- 

 out from other local races of C. avenacea. 



The shape of the shell is less fusiform, being conic, with 

 rounded, not tapering base ; the whorls are more swollen, the 

 suture thereby deeper, and the aperture broader and more 

 rounded. In C. avenacea jumillensis I have never found the 

 laterally compressed aperture, thus appearing higher than 

 wide, significant of other local races. A peristome really re- 

 flected throughout or on one side only, this race never forms; 



