70 JOURNAL OF CONCHOLOGY. 



the British Museum, I found a var. nov. fasciatus with the 

 ground-colour white or whitish, the mantle marbled with 

 black or dark brown, and with dark lateral bands. The 

 body is hardly marbled, pale, with four dark longitudinal 

 bands, two subdorsal and two lateral. This banded variety 

 is very interesting, as showing a tendency towards strongly 

 quadrifasciate species, like G. nwiehti {YLqz^q) from Tangier, 

 which have hitherto seemed so very different. 



DESCRIPTION OF A NEW SPECIES OF SPONDYLUS 

 AND A NEW HELIX. 



By EDGAR A. SMITH, F.Z.S. 



(Read before the Conchological Society, May ii, 1S92). 



In the year 1889 Mr. Harcourt Powell presented to the British 

 Museum a specimen of a Spondylus from Madeira, which on 

 account of its being so overgrown with worm-tubes, corallines, 

 nuUipores, and other extraneous growths, I was unable to deter- 

 mine. We are now indebted to this gentlemen for two additional 

 specimens of the same species, one of which is in such condi- 

 tion as to enable me to prepare the following description. 



Spondylus powelli. 



Testa magna, snl'globosa, solidissinia, ruhro-purpnrea ; valvce 

 leviter obliquie, postice prodndce : sinistra cost is circiter 11 

 subcBquidistantibus, temnbiis, spinis brevibus arinatis, et inter 

 castas aliis niiniis conspicuis iusfructa, lineis radiantibus 

 tenuissimis minute squamulatis incrementiqne lineis undiilatis 

 pnlcherriine sciilpta : valva dextra prope marginem costis 

 mimerosis subceqiialibus instructa, intus sub cardine profunde 

 excavata ; pagina interna albida, viride vel livido plus 

 minus tincta, ad marginem. saturate roseo vel purpurea 

 limbata, utrinque versus aririculas tenuiter denticulata vel 

 crenulatiX, ad marginem ventrahni dentibus fortioribus 

 munita ; area liganienti triangularis valva. dextra magna, 

 fere oequilaieralis, ad apicem postice inclinata ; denies valvce 

 sinistrcE. fusco tincta, sinistra^ fere albi. 



J.C., vii., July, 1892. 



