CERION, GROUP VI. 223 



spire tlian O. scalarinum Gundl. or C. johnsoni Pils. and Van., and 

 differing from O. fells P. arid V. in the weak development of the 

 teeth. It is decidedly longer than C. sculptum, with smaller aper- 

 ture and more whorls. 



C. JOHNSONI Pilsbry and Vanatta. PI. 29, figs. 69, 70. 



Shell deeply rimate, turreted, with attenuated spire, rather solid, 

 dirty white, lusterless. Whorls 11^, the first one smooth, the next 

 2 striate, forming a somewhat bulbous or nipple-like apex, the rest 

 of the whorls very convex and sculptured with very strong, widely 

 separated ribs, eleven on the penult., one or two fewer on earlier 

 whorls ; strongly striate spirally over ribs and intervals. Last whorl 

 widest, the others regularly tapering, upper portion of spire distinctly 

 attenuated, apex obtuse. Aperture short- ovate, white within ; par- 

 ietal lamella rather long but low ; axial lamella small ; peristome 

 rather widely reflexed, thin, the parietal callus strong. 



Length 32, diam 11, longest axis of aperture 10 mill. Cuba. 



Cerion johnsoni PILS. and VAN., New species of the genus Cerion, 

 p. 2 (May 4, 1895); Proc. Acad. N. S., Phila., 1895, p. 207 (June 

 18, 1895); 1896, p. 322, pi. 11, f. W.Strophia faxoni MAYNARD, 

 Contrib. to Science, iii, p. 32, pi. 7, f. 1, 2 (March, 1896). 



This species resembles C. scalarinum in sculpture, but is much 

 larger, with the spire far more attenuated above. It is one of the 

 most remarkable species of the genus. Named in honor of Charles 

 W. Johnson, Curator of the Wagner Free Institute of Science. 



C. SCALARINUM (' Gundlach ' Pfeiffer). PI. 29, figs. 65, 66. 



Shell deeply rimate, oblong-turreted, moderately solid, pale flesh- 

 tinted, the ribs whiter, surface lusterless. Whorls 9-^ to 10^, the 

 first one smooth, following 2 densely striate, rather flattened; irreg- 

 ular ribs then appearing ; the last 5^ whorls are very convex, and 

 bear strong, rounded ribs, about 14 on the penultimate whorl ; the 

 ribs and intervals densely and deeply engraved with spiral stria, 

 which are somewhat unequal and rather roughly cut. Last 2 whorls 

 of about equal diameter, those above regularly tapering to the very 

 large and obtuse apex. Aperture rounded, the peristome white, nar- 

 rowly reflexed, parietal callus rather strong, lamella weak, the par- 

 ietal short. 



Length 17 to 18, diam. 6| mill., aperture with perist. 5 to 5| mill, 

 long. 



