﻿SPHyERIUM.— Plate III. 



Splicerium casianeum. Prime. 

 S2>luBrmm suhidosa. Chai-pentier. 

 Hah. United States. 



Species 27. (Mus. Brit.) 



Spu.'eeium simile. S^i/i. testa subovatd eel suhrlwin- 

 • 'i, tiulKKiuiJitterali, liris validis, versus 



uuJr 



«/' 



;i.,K 



injfild; latere antico declivi, 

 ■ivfn'i aiihiirithiiiiiilri. htUre fostico oblique et 6b- 

 ius iss ime truncaio. 



The similar Sphseium. Sliell subovate or subrliom- 

 boidal, horny, neai'ly equLlatcraJ, wrinkled with 

 strong ridges, stronger towards the apex ; 

 anterior side sloped, rather acuminated below ; 

 posterior side obliquely and very obtusely trun- 

 cated. 



'Say. Nichol's Encycl. Am. Ed. 11. 



SoJ). North America. 



Cydas Sarragota. Lamarck. 



It is not so rhomboidal as Sphwriur/i sulcatum, and 



the sulci are larger at and towards the apex. 



Species 28. (Mus. Brit.) 

 SrH^ElUM TEUNCATUM. Sph. testd 2jarvd,pallide corned, 



grisescenti, ccmipressd, subobliqud; latere antico 



brevi, suhrotundo; latere posiico expanso, olliifiie 



truncate. 

 The teuncated Sphjikium. Shell small, pale horn, 



gTeyish, compressed, rather oblique ; anterior 



side short, rather round ; posterior side expanded, 



obliquely truncated. 

 LiNSLEY. Amer. Journ. Sci. N. Ser. VI. p. 234. 

 Eab. United States. 



Species 29. (Mus. Brit.) 



:ld jiarvd, obhngd, coin- 

 Iriv antico hrevissimo, 

 • riiducto, tnmcato : um- 



SPH.EEIUM INCUEVUM. 



pressd, subferrihji h 

 depresso; latere p 

 bonibus aeuminatis. 



The incueved Sphseium. Shell small, oblong, com- 

 pressed, rather ferruginous ; anterior side very 

 short, depressed ; posterior side produced, trun- 

 cated ; umboes acuminated, turned inwards. 



GuPPT. Proc. Sci. Asso. Trinidad. 1872. 



Hah. Isl. Trinidad. 



Species 30. (Mus. Brit.) 



Sph^eium elevatum. 8ph. iestd rotundd, altd, 

 pallidissiine aurantio-corned ; latere antico brevi, 

 rotundo ; latere postico suhe.tpanso, ad marginem 

 dorsalem cuneato ; umhonilms rotmidis, promi- 

 nent ih us. 



The kaised Sph^eeium. Shell rounded, high, very 

 pale, orange-tinted, homy ; anterior side short, 

 round ; posterior side a little expanded, cornered 

 at the dorsal margin ; umboes round, prominent. 



Haldeman. Proc. Ac. Nat. Hist. Phil. I p. 53. 



Hal. America. 



