77 



IVrhap- a -mall variety of tin- preceding -pern-, from which it 

 differs in the produced termination- 'f the rib-. 



8, r\' IN \n< oem, d'orb. IM. n;, ii- ( ."). 



Whorls about <',. whitish or yellowish. with distinct, regular -piral 

 line, with PJ strong, thick r<|iial lamella-, aculeate above. 



Length, 7 mill. 



West Indies. 

 8, < \\M\\A, d'Orb. PI. 1C, fig. 96. 



Whitish, shining, whorls (I, rapidly eiilar^iii'j-, convex', with <!,-. 

 spiral lira-, and PJ-KJ simple ribs. Length, 6-9 mill. 



West Indies. 



S. acuta, Pfr, is a synonym. 

 S. C.IIKNA TA, Linn. PI. 16, figs, 15, 97, 98. 



Thick, white, closely spirally striated, with about 12 rather d 

 low spiral ribs, usually becoming obsolete on the middle of the la>t 

 whorl and produced above into sutural crenulations. 



Length, 15-17 mill. 



Southern Europe ; Canary Is ; W. Indies. 



It is S. raricostata, Costa. 

 Var. S. < KKNULATA, Kiener. Fig. 97. 



The West Indian specimens are wider than those of the 

 Mediterranean and Morch considered them a distinct species, they 

 are so close, however, in other respects, ami particularly in the 

 peculiar appressrd sutural crenulations of the ribs, that I hesitate 

 to give them a separate position. 

 Var IIi)Ti->Hi-:i:iAN.\, d'Orb. fig. 98. 



A very narrow form, differing considerably from the usual W- 9\ 

 Indian type, as above, being as much narrowrr than & crenata as 

 the former is wider. Length, ll'o mill. 



S. crassicosta, Gray Ms. and of 0. B. Adams are both referred 

 here by Morch ; the former, which is figured by Sowerhy from a 

 -pecimen without locality in the British mu>eum i fiir. 1 ~> appeai-s 

 more like the typical S. crenata. On account of the fossil X. 

 r/v/sx/VWf//'/ Desh. \\>t chan-vd Cray's name to 8. 

 Morch add- N. <-<>,i'i\> ///, Ml--. 



Var. < i;i:\ \\> >\\>\-, ( 'arp. PI. 16, fig. 1. 



Stout, like Var. <-,- mi/ntn, l)ut shorter. Lenu'th, l.'J mill. 



j . Lucas, 



