DTTNDKT GASTEROPODA. ^^ 



the whole shell. On the base of the last whorl are distinct 

 transverse lines which cross the spiral lines. 



The Tariable elevation of the spire is seen in Sowerby's figures. 

 The spire is sinistral. 



There are more than two dozen specimens in the Museum. 



Localities — Dundry and Yeovil. Inf. Ool. 



CIERTJS PYEAMIDALIS, n. sp. PL 2, fig. 10. 



Shell acutely conical, whorls numerous, convex; a single 

 slight keel or projecting ledge on the last whorl; the whorls are 

 crossed by numerous rounded costse which are prominent above 

 the keel, but become almost obliterated below. The whole 

 surface of the shell is adorned with a granulation formed by the 

 crossing of spiral and transverse dotted lines (the cross lines are 

 not seen in our figure). The umbilicus is surrounded by faint 

 radiating costae. The base of the last whorl is convex, and has 

 decussating lines, but the costse do not extend immediately 

 below the narrow keel ; they reappear however round the 

 umbilicus. 



We have not met with such variations in the height of the 

 spire as are seen in the preceding species. 



There are three specimens in the Museum. 



Locality — Dundry. Inf, Ool, 



PLETJROTOMAEIA ELOITGATA, Sowerby. 



1819 Trochus elongatus, Sowerby. Min. Conch, pi. 

 193, figs. 2— -S, (=Pleuroto- 

 maria, Index to ditto.) 

 1858 Pleurotomaria elongata, Quenstedt. Jura. tab. 52, 



fig. 3, and tab. 57, fig, 10. 

 Syn? 1819 Trochus abbreviatus, Sow. Min. Conch, pi. 193, 



fig. 5 (=Pleurotomaria, in 

 Index. 



