THE NAUTILUS. 65 



A NEW SPECIES OF CERION. 



BY W. H. DALL. 



Mr. J. A. Stevenson, of Palm Beach, Florida, recently collected 

 a number of land shells in the Bahamas, adding several species 

 already known from other localities but not from Nassau, to the 

 Bahaman fauna. Among those obtained from Long or Berry Island, 

 was a form of Cerion which appears to be undescribed and is related 

 to the group of C- scalarinum Pfr., called Umbonis by Maynard. 

 Cerion Stevenson i n. sp. 



Shell very variable in general form, but in general roughly cylin- 

 drical, with the nuclear whorls as it were jammed down into the 

 blunt summit of the cylinder, with the base carinate at the periphery, 

 where the ribs cease, and below that constricted; whorls 8-10, 

 nuclear ones nearly smooth, gradually developing fine transverse 

 ribbing with subequal interspaces ; these become stronger, with a 

 strong revolving thread behind the suture ; at the third whorl then 

 the diameter of the shell suddenly increases the sides develop strong 

 transverse rather irregular ribbing with wider interspaces, the ribs 

 extending from the suture to the basal keel, beyond which they 

 rarely extend ; the base beyond the keel is constricted, rudely trans- 

 versely wrinkled, inside the verge of the umbilicus centrifugally im- 

 pressed and axially deeply perforate; aperture very variable in shape, 

 with a broad, flattish, rather thin reflected margin ; there is a parietal 

 short lamina centrally situated and strong, but no trace of an axial 

 fold ; color light brownish or ashy to white, the whole surface sharply 

 spirally striated, the stria?, sometimes crowded, sometimes distant. 

 Alt. of two specimens, A, 27 ; B, 21 ; diam. A, 12 ; B, 14.5 mm. 



Types, U. S. Nat. Museum ; specimens in Stearns' collection, De- 

 troit, Mich., and Mr. Stevenson's collection. 



The entire absence of the axial fold is notable. 



VALLONIA PULCHELLA MULL., IN LOS ANGELES AND ELSEWHERE IN 

 CALIFORNIA, ETC. 



BY ROBERT E. C. STEARNS. 



For several months past, I have been making a careful search for 

 slugs, in the interest of Dr. Pilsbry, with poor results, as these ani- 



