208 CERION, GROUP V. 



Gerion torrei Blanes, PILS. and VAN., Proc. Acad. Nat. Sci.,. 

 Phila., 1898, p. 476, f. 1, 2 (Jan. 13, 1899); with var. ornatum P. 

 and V., 1. c., f. 3, 4. 



This species resembles C. dimidiatum in shape, differing in the less 

 rude texture, less squarely ohese form, higher terminal cone, no trace 

 of a keel defining the base, etc. It has the coloration of C. vulner- 

 atum. O. torrei differs from C. sayraianum in the shortening of the 

 whole shell and especially the cone of the spire. 



A tray in the collection of the Academy from Gibara, contains 

 entirely smooth fleshy-whitish specimens, not variegated, varying in 

 size: 27^x12^ to 25x11 mill., and one shell with regular and dis- 

 tinct, though excessively low, almost obsolete ribs, measuring 26x12^ 

 mill. They were mingled with the strongly-ribbed dimidiatum de- 

 scribed above, and together with them seem to form a connection with 

 (7. torrei and its ribbed variety. Further series of fresh specimens with 

 exact locality data are needed to elucidate these relationships. 



Var. ornatum Pils. and Van. PI. 28, figs. 41, 42. 



Similar in form to the longer specimens of C. torrei, being cylin- 

 drical, b)unt at the ends ; strongly and regularly ribbed throughout, 

 the ribs on the cylindrical portion from one to one and a half mill, 

 apart, and decidedly narrower than the intervals ; parietal margin of 

 peristome more elevated. 



Length 26| to 32, diam. 12^ mill. 



Vita, Cuba (Prof, de la Torre). 



This looks like a distinct species, but we consider it merely a cos- 

 tate form of the preceding. It is more slender than the ribbed form 

 of G. dimidiatum, with finer ribs, continued upon the terminal cone r 

 and there is no basal keel. Its possible relation to C. incrassatum 

 has been alluded to above. G. multicoslum has a nepionic shell of 

 slightly over 2^ whorls, and the cone is distinctly attenuated above r 

 while in ornatum there are but 2^ nepionic wliorls, and the outlines 

 of the terminal cone are slightly convex. The larger specimen fig- 

 ured has 24, the smaller 29 riblets on the penultimate whorl. 



C. MULTICOSTUM (Kuster). PI. 28, figs. 37, 38. 



Shell rimate, cylindric, solid pure white or flesh-tinted. Whorls- 

 nearly 11, the first 1^ smooth, then striate, becoming costulate ; the 

 last three whorls forming the cylindrical portion, on which the ribs- 



