﻿r L A N E P» I S. 



Species 10-'>. (Fig. a, h, Mus. Brit.) 



Pl.^noebis perforatus. Pla. testa parvd, tumidd, 

 pallidt' coi'iied, trn>ir<ito-si(hcoin'cd, *y/fa angus- 

 ti^slmd, anfractii iiltiw,, l,n,i;,l,>, ,dlo, .'<Uj,,rnir 

 ,1,',-riri, infra vtr.lhn.i /v,,/,-/.-,,.,, ,■ dlsm n./rrl'.,;' 

 2,hnnilafo, medio <(/,;/»,-7/ss/,„." rt j^rnj)n,<lr ina- 

 hllirato. 



The perforated Plaxorbis. Shell small, tuiniJ, pale 

 horn, trnncated-snbconical, .s])ire very narrow, 

 last whorl tumid, raised, sloped above, ventri- 

 cose below the middle ; lower disc flattened, 

 narrowly and deeply nmbilicated in the middle. 



Goui.D ? MS. Mus. Brit. 



Hub. United States. 



Species 106. (Mus. Brit.) 



Planorbis cuLTRAxr.s. PJa. testa pellwcidd, Jiyalind, 

 alhd, truiicato-coiilcd, .«|imi parvd, avfractihus 

 tribus, depressis ; anfradu ultimo declivi, infra 

 phxnalo, margine acuminato ; aperturd oliJiqni' 

 suhtrigond, ampifsfd : margine cxierno infra amir 

 angulato ; dixco inferinri piano, medio angtiste 

 umbilicato. 



The sharpened Planorbis. Shell pellucid, hyaline, 

 white, truncato-conical, spire small, whorls three, 

 sunk ; last whorl sloped, flattened below, margin 

 acuminated ; aperture obliquely siibtrigonal, 

 narrow ; outer margin sharply angular below ; 

 lower disc umbllicated. 



D'Orbigxy ? MS. Mus. Brit. 



Hab. St. Vincent. 



Species 107. (Mus. Brit. ? Copied.) 



Planorbis mostanus. I'la. tesid deja-rsm, pallidi 



fulvd, siiiistrali; iipird i ifiindihtdatd ; anfractii 

 ultitno tiimido, snjira iifra^jiir amjiilatn ; di)SCo 

 inferiori concavo ; nfrrtitr:! .<iih,jnudrilalerali, 

 magna, supra onfrartiim vli-muin elevafd. 



The mountain Planorbis. Shell depressed, pale ful- 

 vous, sinistral ; spire funnelled ; last whorl 

 tumid, angular above and below ; lower disc 

 concave ; apertui'e rather quadrilateral, large, 

 raised above the last whorl. 



D'Orbigny. Voy. Amer. Merid. PI. XhW. f. 5, 8. 



Hab. South America. 



Species loS. (Jlns. Brit.) 

 Planorbis Ajimun. Fla. i.s-fd fini.-trali, , 



tncosisst, 



trici ni. 



alli,li: 



prnfi, 



ihriridi-fnlrd 



indiluilat.; .- 

 n.tini.i: rj.r. 



trart;hn.,i„al.rnis..n,.ra. 

 nltlnta lata, ra^udi errsrr„ll, ad ap.rluram 

 e.,pan,o; di.n, inf. rii.ri pr. find! errarata ; a^.rr- 

 turd rnagnd, altissinid, .nhnratd. siq.ernii snpra. 

 sntnram ,I.r„ld, amminatd; infra anfraetnm 

 ultinnini rulnndi: 'prndartu, intiis suleasfan.eo, 

 mar.jinr inierno inrrassato. 



The Ammon Planorbis. Shell sinistral, very large, 

 very ventricose, high, pale greenish-fawn, con- 

 centrically wrinkled ; spii-e deeply funnelled ; 

 whorls four, ronndly elevated above the suture^ 

 last wide, rapidly enlarged, expanded at the 

 aperture ; lower disc deeply hollow ; apertnre 

 large, very high, subovate, raised above over 

 the suture, acuminated ; roundly produced below 

 the last whorl, rather chestnut within, lower 

 margin thickened. 

 Gould. United States' Expedition. 

 E.ah. America. 



The deep specimen of Pla. corpidentin:, figured in 

 the first plate, resembles this species, but is not nearly 

 so high nor so ventricose, and the upper part of the 

 whorls are angular instead of being round. 



Species 100. (Mus. Brit.) 

 Planorbis elevatus. I'la. /rxtd pared, albd, deatrali, 

 IcBvigatd, altiiisenh'i -. spied planulatd, anfractihm 

 Cflveexiiifieiilis, nllimo .luhqiiadrato, superne de- 

 el iri. snj'i-d iifeaqn,' angulato; aperturd infra 

 anijuhiid nllinii anfraeliis depressd, magna, siiprd 

 infrdiiiie angulatd, medio convexd ; diseo inferinri 



The elevated Planorbis. Shell small, white, dex- 

 tral, smooth, rather high ; spire flat, whorls a 

 little convex, last rather square, sloped above, 

 angular above and below ; aperture depressed 

 below the angle of the last whorl, convex in 

 the middle ; lower disc angularly concave. 



Sat. .Tourn. Host. Soc. Nat. Hist. 3, PL III. f 1.^. 



Hah. Vermont. 



The above name is probably given to the shell 



because the last whorl against the moutli is raiscil 



considerably above the aperture. 



