Two Species of Cypraja. 



209 



doubt, and further rendered conspicuous by two white spots, 

 one towards either extremity, at the point of junction of the 

 ribs wirh the callosity, and both quite covered by it. 



Affinity also exists between galapagensia and prdla, Gask., 

 and likewise subrostrata, Gray, both inhabitants also of the 

 Galapagos group. These small species are much of the same 

 size, the latter possessing a decided sulcus, and with beaked 

 extremities — hence its trivial name; whilst puUa is less 

 globose, having tine ribs, with hardly any definition even of 

 a sulcus. 



No trace of any dorsal callosity has, so far as I am aware, 

 ever been found in any other Trivia such as exists in the 

 species before us. 



Cyprcea (Trivia) Buttoni, sp. n. 



C. (Trivia) testa parva, ovato-globo3a, pallide strarainea, apud 

 latent pauilum diktata, costis ad quatuordecim, fortibus, con- 

 tinuis, hie iliic iaterruptis vel subdivaricatis, ad dorsum pnecipue 

 latis, lawibus, albis, sulco nullo, apud extremitates pauilum pro- 

 dueta, basi subconvexa, dentibus labialibus ad octodecim. 



Long. 5*50, lat. 4 mm. 



Hah. 



? (F. L. Button, Esq.). 



A small, globular, straw-coloured Trivia, few ribbed, these 

 being continuous, occasionally interrupted or subdivaricate, 

 broad, especially dorsally ; there is no sulcus present; the 

 shell is slightly produced at the extremities ; labial teeth 

 eighteen in number. 



+ 



NT Vt^ 



Cyprcea Buttoni. 



But few species are very comparable with this: acutidentata, 

 Gask., may be akin, but the type is lost, and I have never 

 seen anything but the original insufficient description ; pauci- 



Ann. & Mag. N. Hist. Ser. 7. Vol vi. 14 



