NEW BRITISH MARINE SHELLS. 



By J. T. MARSHALL. 



Scintilla eddystonia, n. sp. 



Shell triangularly oval, a little broader than long, with an 

 obHqiie outHne, compressed, moderately solid for its size, semi- 

 transparent, and glossy ; sculpture, numerous but irregular con- 

 centric lines of growth ; periostracum, none ; colour, clear white 

 except for irregular frosted patches, which are opaque ; margins 

 regularl}' rounded in front and at the sides, but with a more 

 extended slope from the beak on the anterior side ; beaks small 

 but prominent, somewhat incurved, and nearer the posterior 

 side ; teeth, in the right valve, two strong and prominent 

 cardinals, the posterior one being the larger, and a small 

 lateral, on the posterior side ; in the left valve, the same 

 number and kind of cardinals, but not quite so large, with the 

 position reversed, and the same lateral ; inside highly polished ; 

 margins plain ; muscular scars large and distinct. Length, 

 0-85; breadth, o' I. Localities: Eddystone, Land's End, and 

 Guernsey. 



Figure i. Scintilla cddysiJiiia, n. sp. (enlarged). Eddystone. 



I have been greatly puzzled where to place this species. I 

 submitted it to Dr. Boog Watson and Mr. Edgar Smith without 

 receiving any enlightenment. The Marquis de Monterosato, 

 however, who has made the subject of Mediterranean mollusca 

 his own, writes that it is '• a species of a genus allied to Scacchia, 

 near to 5. inversa, Hil., and S. pnsilla, Brugn., but different and 

 smaller." The two last-mentioned species are Monte Pellegrino 

 fossils. 



