72 MOLLUSCA FROM THE CRAG. 



volutions, ornamented with four or five elevated transverse ridges, decussated by 

 elevated lines of growth ; base naked ; canal very short. 



Axis, I of an inch. 



Localify. Cor. Crag, Sutton. 



A few imperfect specimens of what I had considered in my Catalogue as a distinct 

 species are in my cabinet ; they appear to differ from the preceding in the absence of 

 the granules upon the transverse bands ; it is possible it may be only an altered form, 

 although at least twenty fragments present the same characters ; but better specimens 

 are necessary for such a determination. Its present name may therefore be considered 

 only as provisional. 



7. Cerithium perpulchrum. S. Wood. Tab. VIII, fig. 10, 10 «. 



C. Testa parvd, conieo-turritd, vel suhulatd ; sjnrd elevatd ; apice acuminato ; an- 

 fradibus 10 — 11, convexiuscuUs, cingulos tres vel quatuor obtusos ferentibus, interstitiis 

 tenuissime striatis, longitudinaliter obsolete plicatis ; labro subsimiato ; canali brevissimo. 



Shell small, clongato-conical, or turriculate, with an elevated spire, and acute apex; 

 volutions slightly convex, furnished with three or four obtuse transverse ridges, having 

 fine striae between them, obsoletely plicated longitudinally ; canal very short ; outer 

 lip subsinuated and slightly recurved, with a somewhat expanded inner lip. 



Jxis, \ an inch. 



Locality. Cor. Crag, Gedgrave. 



One specimen in my own cabinet, and two from that of Mr. Daniel, are all that I 

 have seen, and these are somewhat in an altered condition, with a slightly eroded 

 surface. It bears a resemblance to C. twmtellatum, Deshayes (Coq. foss. des Env. de 

 Paris, p. 415, pi. 49, f. 10-11), but is much more tapering in form, with rather less 

 convex volutions, and has more distinct longitudinal plicae, produced by a slight reflec- 

 tion of the outer lip ; the two ridges of the lower part of the volution are the most 

 prominent, particularly the one around the edge of the base. The lower part of the 

 outer lip is a good deal expanded, and the inner lip considerably spread. It is a pretty 

 shell, and I was unwilling it should be unfigured, but, like the preceding one, better 

 specimens are necessary for correct determination. 



Sect. /3. SINISTRAL. 

 8. Cerithium adversum. Mont. Tab. VIII, fig. 8, 8 a. 



MtiREX ADVEKSUS. Morit. Test, Brit. p. 271, 1803. 



Cerithium adversum. Brown, lllust. Brit. Conch, pi. 48, fig. 64 (male), 1827. 



— S. Wood. Catalogue 1842. 



Triforis advebsa. Lovin. Ind. Moll. Scand. p. 21, 1846. 



C. Testa minutd, subcj/lindricd, sinistrorsd ; anfractibus planis, chiffulos tres granosos 

 ferentibus ; apice acuta ; canali brevi recurvo, subclause. 



