146 MOLLUSCA FROM THE CRAG. 



have no 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 ylobosd, crassd, imperforatd, lavigatd ; spird elevald ; anfractibus quinque, 

 convexis ; suturisprqfundis; aperturd ovatd ; umbilico callo, complanafo, 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 differ 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 strice upon its 

 outer coating. 



10. Natica Grcenlandica. Beck. Tab. XII, fig. 5, a — b. 



Natica Grcenlandica. Beck (in Matter). Ind. Moll. Greenland, p. 7, 1842. 

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



— livida. Bean (in Thorpe), p. 265. 



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



the Brit. Isles. 



N. Testa ylobosd, laviusculd, solidiori, perforata ; anfractibus quatuor, convexis ; 

 spird mediocriter elevatd ; apice obtuso, plerumque corroso ; perist ornate subcontinuo ; 

 umbilico angusto, pro/undo ; opercido corneo, tenui. 



Shell globular and rather glossy, strong, and perforated with four convex volu- 

 tions, 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. 



