﻿P L A N R B I S. 



Species 85. (ilns. Sowerliy.) 



PlaxORBIS MeKGUIENSIS. P/a. fi-<t,! fn^r,!. niiiO'iiirin' 

 U'uuiter striafd, tinnl.l.K ntujn^fd, all,;, ^uriMraV, ; 

 spird parvd, iiifimdiluilald, : mifi-nrlihii^ npicnJi- 

 hus ,ni>,u,th. nilnnn sir/.n-ur ,unji,l„tn, ,:,j,rn ^nta- 

 raw dernto; lunlln ,/ injWi rohiiidnln ; apniurd 

 itfimihiixtri, supra inifractiun uUirmmi elevild, iii- 

 ti'is castaiico, manjine subexpanso, intus incras- 



The Merghi Pi.anorbis. Sliell lirown, concentrically 

 finely striated, tumiJ, narrow, high, sinistral; 

 spire small, funnelled ; apical whorls narrow, 

 last angular above, raised above the suture ; 

 rounded in the middle and below ; aperture 

 semilnuar. raised above the last whorl, chestnut 

 within, margin a little expanded, thickened 

 within. 



Philippi. ? Hanley, Indian Shells. 



Hah. Mergui, Burmah. 



Species 8G. (Fig. «, h, Mus. Sowcrby.) 



Planorbis concavus. Pla. testa parvd, alhd, drprcssd, 

 dextrali, Imviijatd ; spird plaHiuscnld , ,:iifi;iiiihiis 

 (juaternis, rapidi: crescentihus, s>i}i>'nir iii/m/r'jih: 

 rotinidati's ; ajii'rturd ohliipih rotund,!, nimjnd ; 

 disco hifiriori e.rcaralo. 



The concave Planorbis. Shell small, white, depressed, 

 dextral, smooth; spire rather flat, whorls four, 

 quickly increased, rounded above and below ; 

 aperture obliquely rounded, large ; lower disc 

 hollow. 



Anthoxy. — — ? :\IS. Mus. Brit. 



Hah. River Ohio. 



Species 87. (Pig- ", &, Mus. Sowerby.) 

 Planorbis rAKVus. Pla. testa drpressd, cumplanatd, 

 se„i!j,eU,o:;dd. suhnrodr fns,-d. dclrali; spird 

 laid, s,d,o.niphu,atd : „„jn,,i;i,„s .iiottmns. sic- 

 p.-nir co,ir„.ri;,s.-,di^, nifrr.ir ,;.tii,idalis: nlfinio 

 latli'iscido ; aperiard .jhU^pd snbocatd, d.'pr.'ssd ; 

 disco iiiferiori concav). 



The SMALL Plaxorbls. Shell depressed, flat, semi- 

 pellucid, greenish brown, dextral ; spire broad, 

 flattened ; whorls four, convex above, rounded 

 below ; last rather broad ; aperture obliquely 

 subovate, depressed ; lower disc concave. 



Say. Alb. Monog. PI. IV. f. 19, 20. 



Plaiiorhi? faUa.v. Say CO 



Ilal). New York. 



Species 88. (Mus. Brit.) 



Planorbis deflexus. Pla. testa depressd, pallid!' cor- 

 ned, laevigata, dextrali ; sptird aiujustd, de^irf^sd, 

 niijraiiUuix trilus, snjirrne convexis, iriferiii' rolim- 

 dis, n'pi,li- rr, r:cr,,lil,i(s, ultimo lato; apcrfiini 

 >,!,'.,„,;, r„li,li' drj!,,d. 



The down-bent Planorbis. Shell depressed, pale 

 horn, smooth, dextral ; spire narrow, depressed, 

 ■whorls three, convex above, rounded Ijelow, 

 rapidly increased, last broad ; aperture large, 

 strongly deflected. 



Sat. Long's Expedition, Appendix, Pi. XV. f. 8. 



Planorbis oirciis. Adams. 



Hal. River Ohio. 



Species 89. (Mus. Brit.) 

 Planorbis oinEXTALis. J'la. t.'std t,'„ni. irmjidaritrr 



„iid,ih,td.j!nrid:' all.idd. siiiistraii : .<pird ,n,,j„sfd. 

 d,-,,r,'^s.!:' an/r„,-/il.H, sNor.i si,t:n;:n, jundi. ,d, . 

 vatis, altimo' Into, dcdici, ccrsi^s op.r/rnn. ..,: 

 panso ; aperturd stcprd infraque compr.S'i,!, nonjn,;, 

 oblique defiexd; margine sinuato ; discn in/, rion 

 coii.cavo. 



The oriental Planorbis.- Shell thin, irregulnrly 

 undulated, yellowish" white, sinistral ; spire nar- 

 row, depressed ; whorls a little raised above the 

 suture ; last broad, slojjed, expanded towards 

 the aperture; aperture compressed a^ore and 

 below, large, obliquely deflected; margin sinu- 

 ous ; lower disc concave. 



LA5IARCK. Anim. s. Vert. 



Hal. India. 



