146 MOLLUSCA FROM THE CRAG. 



i 

 doubt of the identity. The original specimen dredged up to the northward is covered 



with fine striae, but the fossils are quite smooth. An imperfect specimen is among 

 the shells sent by Mr. Leckenby, found by that gentleman at Bridlington. 



9. NATICA OCCLUSA. S. Wood. Tab. XII, fig. 4, a b. 



N. Testa globosd, crassd, imperforatd, Icevigatd ; spird elevatd ; anfractilus quingue, 

 convexis ; suturis profundis ; aperturd ovatd ; umbilico callo, complanato, prorsus obtecto. 



Shell globose, imperforate, thick, strong, smooth, and glossy, with five or six 

 convex volutions, and a deep distinct suture ; spire elevated ; apex somewhat acute ; 

 aperture ovate ; umbilicus covered by the callosity of the left lip. 



Axis, 1 inch. 



Locality. Mam. Crag, Bridlington. 



One specimen of this shell, from the cabinet of Mr. Leckenby, is all that I have seen ; 

 and being unable to identify it with any species known to me. I have ventured to give it 

 a name. Its most distinguishing character is the callosity of the left lip, which entirely 

 covers the umbilicus much in the manner of that in N. clausa, from which, however, 

 it appears to diifer in its much more elevated spire and less tumid volutions, and it 

 also wants the peculiar flatness near the suture, which exists in that species. There 

 is a slight flattening upon the lower part of the columella, but not the distinct 

 impression on either side of the aperture that is generally made by the pressure of 

 a calcareous operculum ; I therefore presume this to have had a corneous one. It is 

 faintly but distinctly covered with fine spiral striae upon its outer coating. 



10. NATICA GRCENLANDTCA. Seek. Tab. XII, fig. 5, a b. 



NATICA GROENLANDICA. Beck (in Moller). Ind. Moll. Greenland, p. 7, 1842. 



Thorpe. Brit. Mar. Moll. fig. 55, 1844. 

 LIVID A. Bean (in Thorpe}, p. 265. 



GIUENLANDICA. Forbes. Rep. upon the Geol. Rel. of the exist. Faun, and Flor. of 



the Brit. Isles. 



N. Testa globosd, Iceviusculd, solidiori, perforata ; anfractibus quatuor, convexis ; 

 spird mediocriter elevatd; apice obtuso^plerumque corroso; peristomate subcontinuo ; umbilico 

 angusto, prof undo ; operculo corneo, tenui. 



Shell globular and rather glossy, strong, and perforated with four convex volutions, 

 and a slightly elevated spire, finely striated transversely ; umbilicus small, deep, and 

 open ; left lip slightly spreading ; aperture ovate ; operculum thin and corneous. 



Axis, ^ an inch. 



Locality. Mam. Crag, Bridlington. 



Recent, Coast of Scarborough and North Seas. 



