﻿r L A N Pt B I a 



Plate XII. 



Species 95. (Fig. a, h, Mus. Brit.) 

 PlANORBIS PaNAMENSIS. I'I't. trgt,! pan:!, itlliiihi, rom- 

 pressd, semipelluriiLi, iJr.rfrnli ; .<jiii-:! jhuti? ,- 



(ivfradlhus tyiJiHS, Jrj„ 



.hStlncfi 



]>^ 



;</,/.'• ,-,-,..vtv»^7,i(.8; «///,»„ l„l„: ./is,:, iiijrnnn 

 omciion, anfractlbus rot,n„!!s : ,ip,,-liir.! siihorat,!. 



Thk Panama Planiebis. Shell small, wbitisb, com- 

 ))ressed, semipellucid, dextral ; spire small ; 

 whorls three, depressed-convex, distinct, quickly 

 increased ; last broad ; lower disc concave, an- 

 fractibns rotnndis, aperture snbovate. 



J>'Orbignt. Proc. Zool. Soc. 184S, j,. 41. 



Hub. Panama. 



Resembling Phi/mrhis hILks, but with the whorls 



more rounded and distinct. 



Species 96. (Mus. r' Co])icd.) 



PlaNORBIS HELOICfS. Plii. fi'sl,! Jal,l, cornjilaitatn, df.c- 

 trali, fusco-ferruijiiii ii, stn'uln, paulu arcuatd ; 

 apird plaimlatd, aii/nuiihiis i/iiinis, rotundis ; 

 aperlurd oblique ovato, subrvtimdd ; disco inferiori 

 excavato. 



The nail-shaped Planorbis. Shell broad, flat, dextral, 

 rusty-brown, striated, a little arched ; spire flat- 

 toned, whorls five, round ; aperture obliquely 

 ronnded-oval ; lower disc hollow. 



D'Orbiony. Voy. Amer. :\l,:Tid. PI. XLV. fig. 9-12. 



Hub. South America. 



Species 97. (Mus. ? Copied.) 



Planorbis pasopseides. Pla. testd redd, parvd, lati 

 I'l.-icfiJd, suhcomplanatd, dextnili,fiisco, ferniijiiied. 



ohl 



'I'" 



medium fumidiiiscuU,, 



iluiiaf,!,' aiifnidibns 

 ilis, innjiislif, infra 

 'urd dcprcssd, infra 



jiaiilu iiijiatd ; disco inferiori lati- umbilicalo. 



The 'dlsh-liee' Planorbis. Shell straight, small, 

 rather broad, flattish, dextral, rusty-brown, 

 obliquely striated ; spire flattened ; whorls five, 

 rather flattened above, narrow, rather tumid 

 below the middle, aperture depressed, a little 

 inflated below ; lower disc broadly umbilicated. 



D'Orbigny. Voy. Amer. Merid. PI. XLV. f. 5-8. 



Hah. South America. 



apeiiuram opmisn; aprrturd siijifmi- siitmriniii- 

 natd, iiifnl laid. 



The sun-loving Planorbis. Shell flattened, snbde- 

 pressed, pale fulvous, sinistral, smooth ; spire 

 funnelled ; whorls five, I'ather tumid, angularly 

 raised above the suture, rounded below ; last 

 somewhat angular above, then sloped, expanded 

 towards the aperture ; aperture subacuminated 

 above, broad below. 



D'Orbigny. Voy. Amer. ISK-vid. PI. XLV. f. 13-10. 



Hah. South America. 



Species 99. (Pig. a, h. Mus. Brit.) 

 Planorbis anatfnus. I'la. t>'sld miimtd. fuwid.d. cm- 



drpressd. snh.jlnhns,; ■ 



.! : „,ih;trtih„\ lrilu,.<. 



I""' 



uirdiu 



ajirrfiin, ,i lujiisl,,. srmihiu.i n : ,l,sr,, ,„Jr,;nn an- 

 ijusli umhilicato. 



The duck's Planorbis. Shell minute, tumid, horny, 

 depressed, subglobose ; spire small, slightly ex- 

 cavated ; whorls three, high, convex in the middle ; 

 aperture narrow, semilunar, lower disc narrowly 

 umbilicated. 



D'Orbigny. Voy. Amer. Jlerid. PL XLV. fig. 17--20. 



Hab. South Africa. 



Species lOU. (Fig. a, b, Mus. Brit.) 



Planorbis Arakanensis. Pla. pallid'e corned, frans- 

 liicidd, tinnidd. df.rtrali ; spirdangustd ; anfradu 

 iiltiiiin tumid,!. sHjirnii' siibaiiffiisfato, infra medium 

 i::iitrli;i.-<,i ; dig,;' iiif,-ri,iri concavo, anfradu api- 

 cali uhfedo. 



The AraKiVN Planoruis. Shell pale horn, translucid, 

 tumid, dextral ; spire narrow ; last whorl tumid, 

 a little angular above, ventricose below the 

 middle ; lower disc concave, apical whorl hidden. 



GouLii. ■:- MS. Brit. Mus. 



Hah. Trinidad. 



