SPII^RA. 



150 



Remarlx. — This species is tlio type of the genus Sjihmru. Tt is fairly coiiiiikhi 

 in the Ferna-hed of the Isle of Wight. A young example is figured by d'Orhigny. 



Ti/pr. — The type was obtained by Professor Sedgwick from the 7V/-y(((-bed of 

 Sandown, but cannot now- 1)0 found. 



Fiu. 2ij.—t>phxra con-wjala. Sow. Lower GroensanJ, iioiu- Ilythe. Miisoiuu of I'nictical Guology, 



No. I'JTIG. Dorsal view, x -J. 



Bidriblllioll.—Lo^ycr Greensand {I'cnia-hcd and Crackers) of Alherlield ; also 

 recorded by Fitton from Beds viii and xiv, Hythe Beds of Hythe and Maidstone. 

 Eecorded by Topley from the Atherfield Beds of Peasmarsh and Shalford ; the 

 Hythe Beds of Lympe ; and the Sandgate Beds of Sandgate.' 



Si'UJiiiA, sp. Plate XXV, fig. 'S. 



A small specimen from the Chalk ^Marl of Clmrd appears to l)elongto a distinct 

 species. It is much smaller than S. covriKj'dii, also relatively longer, more ovnl m 

 outline, and less inflated. The escutcheon is not defined, the lunule is small or 

 absent, and the antero-dorsal margins are thick and prominent. The concentric 

 ridges resemble those of 8. cornniala,h\.\ii\iQ radial ribs are more distinct. Length 

 IG'5 mm. ; height 14 mm. ; thickness 12'5 mm. 



1 The type of Corhis ? fibrosa, Forbes, from Peasmarsh, is in tlie Museum of the Geolo^'ical 

 Society (R 215-1), but is too imperfect for deteriniuatiou. Forbes, 'Quart. Jouru. Geol. Soc.." vol. i 

 (184.5), p. 239. 



