PLATE CXXVII. 



writer, '* must own I have never met with this species since on any 

 other British coasts." We have since seen it among parcels of shells 

 from the Mediterranean, and also find that it has been discovered by 

 the late Dr. Puitney, on the North shore, Poole ; and at Weymouth. 



The specific character of the Gmelinian Trochus Granattim, 

 seems to accord very nearly with our shell *, but it is about twice the 

 size, and inhabits the Southern Ocean ; and it is certainly more pro- 

 bable, as some conchologists have suggested, that it is the variety of 

 Trochus Zi/.yphinus, described by Linnseus in the M.us. Rcgiiuc, 

 as being " tota pallida, anfractibus basi gibbis, striatis, subtitissime 

 punctis papilloris." It differs from Zi/yphinus in having the anfrac- 

 tus a little rounded, and the wreaths being encircled with granulated 

 spiral ridges. The name Da Costa lias already given it, is very ap- 

 plicable ; and as it has undoubtedly escaped the notice of Gmelin, 

 there can be no impropriety in retaining it. — It is evidently one of the 

 rarest British species of the Trochus genus. 



* Testa pyramidaii alba coccineo varia basi subconvexa ; spirse anfiactibas convexis; 

 cingulis granorum moniformibus, primis duobus maximis. Gmel. 3584. sp. 108. 



