figured in Phillips's l Geology of Yorkshire. 1 299 



will have to be abandoned, and the shell must in future be 

 known as Naticopsis spirata, Sow., sp. It is the 



Nerita spirata, J. de C. Sow. Min. Concli. 1824, v. p. 93, t. 463. fig. 1 

 (excl. fig. 2). 



Natica ampliata, Phillips, as above. 



Nerita spirata, Porfclock, Geol. Report, 1843, p. 420, t. 31. fig. 8. 



Nerita ampliata, De Koninck, Aniinaux Foss. p. 485, t. 42. fig. 2, a-c. 



Pileopsis ampliata, Goldfuss, Petref. Germ. iii. p. 11, t. 168. fig. 4, a, b. 



Naticopsis ampliata, M'Coy, Brit. Pal. Foss. 1853, fasc. iii. p. 543. 



Natica ampliata, Morris, Cat. Brit. Foss. 1854, p. 262. 



Natica lirata, Phillips (p. 224, t. 14. figs. 22 &31). 



There are three specimens of this species in the Gilbertson 

 collection, one of which certainly represents fig. 31 ; but 

 whether we have the original of fig. 22 is questionable. This, 

 which is a decided Naticopsis in form, will probably require 

 separation, from the nature of the surface-ornamentation and 

 the presence of an umbilicus ; at least, one is said to exist by 

 De Koninck, and one of our specimens decidedly appears to 

 bear this out. It is the 



Natica lirata, Phillips, as above. 



Narica lirata, De Koninck, Aniniaux Fuss. p. 476, t. 42. fig. 5, a-c. 

 Natica lirata, Morris, Cat. Brit. Foss. 1854, p. 263. 

 (Compare Narica spinescens, De Ryckholt, Mem. Couronne's Acad. R. 

 Belgique, 1852, xxiv. p. 71, t. 3. figs. 1-3.) 



Natica elliptica, Phillips (p. 224, t. 14. fig. 23). 



The larger figure in outline appears to have been restored 

 from a badly preserved large individual in the collection. Of 

 the smaller figure I can find no exact representative, although 

 there are several which might pass for it. The oblique striae 

 round the suture are fine, and do not much exceed in size the 

 lines of growth over the general surface of the shell. The 

 apex is flat or slightly projecting. The inner lip slopes 

 inward and is flattened, with its outer edge more or less sharp ; 

 there is no trace of a tubercle or callosity. It is the 



Nerita spirata, J. de C. Sow. Min. Conch. 1824, v. p. 93, t. 463. fig. 2 

 (excl. fig. 1). 



Natica elliptica, Phillips, as above. 



? Nerita spirata, De Koninck, Aniinaux Foss. p. 484, t. 42. fig. 3, d. 



Natica ampliata, Morris, Cat. Brit, Foss. 1854, p. 263. 



(Compare Naticopsis Phillipsii, M'Coy, Synop. Carb. Limest. Foss. Ire- 

 land, 1844, p. 33, t. 3. fig. 9, t. 6. fig. 4, a, b.) 



Natica plicistria, Phillips (p. 225, t. 14. fig. 25). 



The type of this species is a well-preserved shell. One of 

 the most important features of this species is the flat or con- 

 cave condition of the upper portions of the whorls next the 

 suture, and which is constantly obliquely strongly striated, 



