FULTON: NEW SPECIES OF SYNAPTERPES. 85 



The specimen I have taken as the type is an average example, but 

 two or three older specimens show a curious variation in peristomal 

 callosities (Fig. 2) — for instance, one specimen has a very small 

 aperture with the peristome thickened and continuous, with two 

 prominent, shortly entering plaits situated on the outer margin, close 

 to the suture ; another specimen has also the two plaits, but one is 

 on the parietal wall and the other on the peristome, both close 

 to the suture ; another specimen has the plait on the parietal wall 

 only ; a fourth has a thin lip with a single long entering plait 

 just beneath the suture. 



Named in honour of Dr. H. A. Pilsbry, of Philadelphia, the eminent 

 and indefatigable American malacologist. 



