TlPO Specien of Cypraia. 209 



douhr, and turtlier rcud'TeJ con.^picuous by twi white spot^, 

 one towards •iitluM- extre:<iity, at tlie point of junction ot' tlie 

 rib-» wirli tlie callosity, an I bitli quite covere I hy it. 



Affinity also exists between gaUip Kjeiisis and puLla, Gask., 

 and likewise tfui/-ui</-a^ci, CJ ray, bjtii inhabitants also of the 

 Galapagos p;ronp. These small species are much of the same 

 size, the latter possessing a decided sulcus, and with be:iked 

 extremities — hence its trivial name ; whilst pulix 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) Buttoiii, sp. n. 



C. (Trivia) testa parva, ovato-glohosa, pallide straminea, apud 

 latera paullum dilatata, costis ad quatuordecim, fortibus, con- 

 tiimis. hie iliic iiitorriiptis vel sub livuricatis, ad dorsum praeoipue 

 hiti^, liBvibus, albis, sulco nullo, apud extremitates paullum pro- 

 ducta, basi subcoavexa, dentibus labialibus ad octodecim. 



Long. 5'5it, lat. 4 mm. 



Jjab. ? {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. 



+ 



Ct/prtta Buttotii 



But few species are very comparable with this: acuddentata, 

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

 seen anything but the original insufficient description ; pauci- 



Ann. d: Mag. S. Hist. Ser. 7. Vol, vi. 14 



