288 Mr. H. Seeley on Cambridge Palaontology : — 



Solarium Carteri. PI. XI. fig. 12. 



Shell thick, composed of about six angulated whorls, which very 

 gradually increase in size. Spire somewhat elevated. Whorls 

 flat above. The side is angular, the upper part of it narrow 

 and perpendicular, the lower part twice as wide ; it has on its 

 lower part four obscure little grooves, which are crossed by 

 numerous close longitudinal stria?. Umbilicus conical, twice 

 as wide as deep, exhibiting all the whorls ; whorls separated 

 by a wide deep suture. The angle which the umbilicus makes 

 with the base of the side is coronated with a row of large tu- 

 bercles, about sixteen on a whorl ; and the edge of the suture 

 has a numerous row of little granules ; between the rows are 

 six or eight striae. Aperture externally 5 -sided. Cast round 

 and smooth. 



This species is distinguished from every other by its tubercu- 

 lated angles and striae. It is most nearly related to Trochus 

 Leymeriei (D^Arch.), but differs in having a flat side, &c. 



This little shell is far from uncommon in the form of casts 

 and impressions of the umbilicus ; but hitherto I have not seen 

 the upper shell. Diameter half an inch. 



Coll. J. Carter, Esq. ; G. D. Liveing, Esq. ; University. 



Nerita [Neritopsis) scalaris. PI. XI. fig. 13. 



Shell thin, as wide as high. Spire very small, scarcely elevated, 

 consisting apparently of two whorls. Body-whorl very large, 

 moderately inflated, and expanding very rapidly ; it is orna- 

 mented with twenty-two longitudinal ribs, which are greatly 

 elevated, and separated by spaces as wide as their bases. The 

 ribs are rounded on the side towards the mouth, and a little 

 hollowed posteriorly. Mouth semicircular, thin. Columella 

 apparently very deeply cupped. 



This beautiful little Nerite (the first from our English Cre- 

 taceous beds) has a thinness of shell very unusual in the genus. 

 The cast is libbed like the shell. This species is very nearly 

 related to N. costatula, Eoemer, but differs in the relatively larger 

 size of the less inflated body- whorl, wider ribs, and semicircular 

 mouth. 



Loc. Coldhams Common, near Cambridge. Coll. Univ. Mus. 

 Collected by H. C. Raban, Esq., B.A. Trin. Coll. 



TURBOiDEA. 



Shell turbinated, slightly round beneath. Whorls convex, tu- 

 berculated (or spinous ?). Aperture round. Peristome con- 



