﻿S P II .E R I U M. 



Plate III. 



Species 21. (Mus. Brifc.) 



Snt.EKlUM MACDLATUM. SjiJi. leMil parvd, olld, Com- 

 pressd, suhqxiadratd, tenni, corned, maculis nigris 

 variegatd; latere aiitico hrevi, ante umhones pauUi 

 e.rcarato; latere poaticn mcujU e.rpanso, subquad- 

 rato, marghie dorsali recti thciilo, nuirginr lateruJi 

 Inti- trunrato. 



The spotted Si'Uj:rhjm. Shell small, liigli, com- 

 pressed, rather square, thin, horny, variegated 

 with blackish spots ; anterior side short, a little 

 excavated in front of the umboes ; posterior side 

 more expanded, rather square, dorsal margin 

 rather straight, lateral margin broadly truncated. 



MouELET. Test. Nov. p. '2-5, 18-51. 



Huh Yucatan, Mexico. 



Species 22. (Mus. Brit.) 



Si'H.EKii-M Madagascakiexse. Sph. testd ovatu-suh- 

 rhomhoided, ferrugined, cornou-subi'iridi, fasciafd, 

 tuinidd, conccntricu tninutia.finic striatd, margine 

 dorsali rcctiihctdo, margiiiil/im taternlitins siditrun- 

 cati.t ; u)nho)iihus ohtU':is. 



The Madagascar SPH.i;uiu.\i. Shell ovate, sub-rhom- 

 boidal, ferruginous or banded with greenish horn, 

 tumid, concentrically very minutely striated, 

 dorsal margin rather straight, lateiul margins 

 rather truncated ; umboes obtnse. 



Tristan (?) MS. Mus. Brit. 



Hidj. Madagascar. 



Species 23. (Mus. Brit.) 



Sl'H.KRlUM STRAMINEI'M. Sjdi. testd suhrhomholded, 

 golidd, ejiideriiiide fidvn-jjacidd indutd; medio 

 versi'is apicem distanter liratd, ad latera ei versus 

 margineiil veniralem IfP.rigatd ; umhonihus rotund i.t 

 promineidibus. 



The STEAW-coLonREii Srnj:RiuM. Shell subrhom- 

 boidal, solid, covered with a fulvous yellowish 

 epidermis ; middle, towards the apex, distantly 

 ridged, smooth at the sides and towards the 

 ventral margin ; umboes rounded, prominent. 



Co.N'RAD. Sillimaii's Journal, Vol. XXV., p. 342. 



Hub. Missouri. 



Species 24 (Mus. Brit.) 



SpH.ERIUM ELEGANS. Sjdi. /.>7.( Imui, a!ld, coiirprc.ii:d. 

 sid„,in,Jr„ld, Jari,,.,l.!.p„l!i,i;' ,:„r„rd, liiiri, ni.jrrs. 

 ce„tlbi,.,1 f.,.ri;.< ,dh;, „n„:l.; : in,ih.,„ih„. ,w-/,o »- 

 train, 1,^, „„n;,i,„-' dm-^nli „fri,„iHr ,,.,„];, dn-liri. 



The ELEGANT Si'U.ERiuM. Shell thin, high, com- 

 pi-essed, rather flat, smooth, pale horn, ornamented 

 with dark lines and white bands ; umboes nearly 

 central, dorsal margin a little sli>]icil on each 

 side. 



Ai.AMS. Boston Journal of Science. 4, PI. IV. f. 2. 



llab. N'ermont. 



Species 25. (JIas. Brit.) 



SpHERIUM ERDRNETM. sph. trsid idtd, snlidd. eliunivd. 

 laevigata, rotund''-'^uh<[u,iidrittd .• lutrre mitiri, 

 angiisttori, brcviori, rutiiiidn : lafer,- j.nslini r.i- 

 panso, lata, subqiiadrato, innrgine dur^ali recto, 'ol 

 ierni.inum crmeato. 



The ivory Sph^rium. Shell high, solid, ivory-white, 

 smooth, roundly subquadrate ; anterior side 

 narrower, shorter, rounded ; posterior side ex- 

 panded, broad, rather square, dorsal margin 

 straight, cornered at the end. 



Anthony (?) MS. Brit. Mus. 



ILib. United States. 



Species 21';. (Mus. Brit.) 



SpH.ERIUM FAl'.ALE. Sph. tcstd c<,„ipres.<d, Icriter .■'ul- 

 catd, castaned, epidermide Jemi'/i m a indutd, suho- 

 ratd, depre.':sd, vald'e incequihiirr^di ; J'ttere antim 

 breri,dee]iri,..ulacuniii,nlo:I„l.repu.<tlroprodartn, 

 lata, „i.ir,ji„e ,/,„•,.,, // ,/,,■,(/„, sidxtcuto, margine 

 tentndi reetie.ruh,. 



The bean Spu-ERIUM. Shell compressed, slightly 

 grooved, chestnut, covered with a ferruginous 

 epidermis, rather oval, depressed, very inequi- 

 lateral ; anterior side short, sloped, rather acumi- 

 nated ; posterior side produced, broad, dorsal 

 margin raised, slightly arched ; ventral margin 

 rather straight. 



Prime. Pro. Soc. Nat. Hist. Brit. IV. 18.51, p. 159. 



