107 



tinguished by a somewhat larger groove; last whorl much 

 smaller than the penult Avhorl, gradually tapering to 

 the end: aperture ratlier small, subrhombio: canal very 

 ehort, nearly straight." Ad. 



Long. 0,(,9 poll. lat, 0^03 j poll. 



Cerithium exiguum C B. Ad. Contr. p. 118. 

 Hab. Jamaica (Ad.) 



* 256. Triphoris nanus C. B. Ad. 



„Sh. conic, turrited, sinistrorsal : wax biown, dark 

 at the apex, sometimes with a white space next below 

 the apex, folloAved bv a white spiral band : with, on the 

 Upper whorls , two , and on the lower whorls, three 

 nearly equal spiral ridges, and many transverse slender 

 ridges, the intersections being Avell developed nodules; 

 anteriorlv with two additional smaller less strongflv no- 

 dulous Spiral ridges: apex very acute: spire >vith the 

 outlines nearly rectilinear: whorls about 9, planulate, 

 with the place of the auture distinguished by a some- 

 what larger groove; last whorl terminating very abruptly: 

 aperture suborbicular, rather small: canal short, nearly 

 straight." Ad. 



„Long. 0,,, pol].; lat. 0,^^ poll." 



Cerithium nanum Ad. Contrib. p. 117. 



Triphoris nana Sow. Thes. p. 897. (nomen.) 



Hab. Jamaica (Ad.) 



257. Triphoris modestus C. B. Ad. 

 „Sh. conic, turrited, sinistrorsal: reddish black, 

 weathering to a cinereous colour with, on the upper 

 whorls, two, and on the middle and lower whorls three 

 Spiral ridges, which are of equal size on the lower Ys 

 of the shell ; and numerous transverse ridges, the inter- 

 sections being well developed nodules; anteriorly with 

 two or three additional spiral ridges, which are less 

 ßtrongly nodulous, and which are separated by a broad 

 groove from a emall ridge around the baae of the canal; 



