56 R. BULLEN NEWTON on 



Oppenheim, from the Lutetian of Egypt, which has an acute apex and 

 consequently a more elevated spire, besides being of less conoidal shape. 



DISTRIBUTION. Lutetian of Europe. 

 OCCURRENCE. Cuttings Nos. 6, 12. 

 COLLECTOR. Mr. Kitson. 



Sinum of. clathratuin (Gmelin). 



PLATE 2, figs. 16, 17. 

 Nerita clathrata. 



Gmelin's I3th Ed. " Systema Naturae" by Linnaeus, 1790, p. 3675. 

 Sigaretus canaliculatus. 



J. de C. Sowerby, 1823, Vol. 4, pi. 384, pp. 115, 116; Deshayes : Desc. Coq. Foss. Paris, 1829, 

 Vol. 2, pi. 21, figs. 13, 14, p. 182 ; Dixon's " Geol. Sussex," 1850, pi. 5, fig. 9, p. 98 ; Cossmann : Ann. 

 Soc. R. Mai., Belgique, 1888, Vol. 23, pp. 168, 169. 



REMARKS. This shell is represented by about eighteen examples of varying 

 dimensions, one of those figured being the largest collected. The specimens 

 exhibit the more or less conical shape of this species with a spiral region 

 which although depressed is well exposed above the posterior margin of the 

 body-whorl. The nucleus is obtuse and surrounded by about two-and-half smooth 

 volutions, while the surface of the penultimate whorl and the succeeding body- 

 whorl are furnished with the closely spiral ornamentation of this species, 

 consisting of minutely banded lines often with irregular or serrated margins, 

 the intervening grooves being furnished with still more delicate and finer spiral 

 striations, the whole being crossed by numerous more or less obscure longi- 

 tudinal striations. Evidently the shell is closely related to the well known 

 European species, although probably possessing a more exposed spiral region 

 and being, perhaps, of a generally less depressed form. The largest specimen 

 has an altitude of 20, width 17, depth 10 millimetres. The species differs 

 from typical forms of Sinum by its conical and depresso-globose contour, and 

 its possession of a more elevated spire. In ornamentation and general 

 contour lines there is great resemblance to Natica striata of Lea (Contributions 

 to Geology, 1833, pi. 4, fig. 88, p. 105) as interpreted by Gregorio (Ann. 

 G&>1. Pal. 1890, part. 7, pi. 15, figs. 9-15, p. 154), from the Alabama 

 Eocene beds. 



DISTRIBUTION. Middle and Upper Eocene of Britain and Europe. 

 OCCURRENCE. Cuttings No. 5, 6, 10, n, 12. 

 COLLECTOR. Mr. Kitson. 



