Some new Upper Greensand Gasteropods. 285 



of growth. Both above and below it are several somewhat 

 close and slightly elevated striae. 



This shell was found in the interior of a Pleurotomaria. 

 Coll. J. Carter, Esq. 



Cerithium tenuistriatum. PI. XI. fig. 6. 

 Shell very elongated, subcylindrical. Whorls about half as high 

 as wide, nearly flat. Each whorl is ornamented with about 

 fourteen straight longitudinal ribs, which are very moderately 

 elevated, obtuse, and separated by wide spaces. Near their 

 termination the ribs expand, and on the bend of the base with 

 the side become obliterated. These are crossed by numerous 

 fine, closely-placed striae, which wind spirally up the shell, 

 and also ornament the base, which is rather convex. Aper- 

 ture four-sided. 



This species is most nearly related to C. Clementinum (D'Orb.), 

 but differs in the greater elevation of the whorls, vastly greater 

 number of striations, and rounded base. In the specimen figured 

 the shell has been converted into phosphate of lime : the striae 

 are as perfectly preserved as in a recent specimen. 



Very rare. University Museum. Collected by W. Bloomfield, 

 Esq. (M.A. Clare Coll.). 



Funis. 



Shell thin, spiral, many-whorled, elongated. Columella straight, 

 scarcely thicker than the shell of the whorls. Edge of the 

 columella inflected and sharp ; base truncated as in Achatina. 

 Mouth ovate. [Shell cancellated ?] . Columellar lip reflected. 

 There is no trace of an internal nacreous deposit. 

 Its place appears to be in the Melaniadae, between Melania 



and Melanopsis. 



Funis elongatits. PI. XI. fig. 7. 

 Shell greatly elongated, sides straight. Whorls narrowed at the su- 

 tures like a tightly twisted rope, very round, two-thirds as high 

 as wide; ornamented with eight or ten spiral ribs moderately 

 elevated, round, and separated by intervals of their own width, 

 or spaces rather wider. Between each of the ribs there is 

 generally a secondary striation, and there are always a few 

 beyond them near to the suture. The space between the 

 lowest rib and the base of the columella is occupied by nu- 

 merous closely placed striae. All these striae and ribs are 

 crossed by very narrow elevated fringes, the number of which 

 increases with age : on a young specimen a quarter of an inch 

 in diameter there are fifteen ; in a large individual more than 



