98 INVERTEBRATA. 



Pleurotomaria gigantea, Sowerby? 



Pleurotomaria gigantea, Sby., Trans. Geol. Soc, 2 Ser., torn, iv., 



pi. xiv., f. 16. 

 „ „ Pictet and Campiche, Pal. Suisse, Terr. 



Orel, St Croix, Vol. III. p. 433. 



There are two types of this large pyramidal Pleurotomaria, 

 namely, the more elevated, flat-whorled type with numerous volu- 

 tions found at Atherfield, and a more depressed broader-whorled 

 type common at Hythe ; in the latter also the sides of the whorls 

 are more arched, and expand at their base. Again, in the Hythe 

 form the spiral ornament lines are coarser and more prominent, 

 and the line of the apertural slit is situated at or below the 

 centre of each whorl. In the Atherfield type this line is usually 

 slightly above the medial line. 



Our Upware shell is nearest to the Hythe type, but as only 

 the inside cast is known the identification is not certain. 



Localities. Upware, Hythe, Atherfield (?). 

 S. Europe. St Croix. 



Pleurotomaria Renevieri, n. sp. 

 (Plate IV., fig. 1, a, b.) 



Pleurotomaria Anstedi, Cat. Fossils Jermyn Street Museum, 



1878, p. 21. 

 [not „ „ E. Forbes, 1845. Q. J. Geol. Soc. i. 



p. 349, pi. 5 (13), f. 1.] 

 [„ „ „ of Pictet and Campiche, Pal. Suisse, 



p. 435.] 

 In his description of Pleurotomaria Anstedi, Prof. E. Forbes 

 writes : " spire somewhat depressed and very obtuse," and his 

 figure corresponds well with the description ; also the margin of 

 the shell is rounded. The Upware shells and that figured by 

 MM. Pictet and Campiche are pointed and their edges sharp. 



These characters are very constant in the genus Pleuroto- 

 maria, and our specimens shew no variation in the directions 

 of Prof. Forbes' type. 



Description. Shell thick, regularly conical, broader than high. 

 Base convex, apex acute, whorls few (six or seven), with convex 



