﻿P L A N E B I S. 



Plate IX. 



Species 09. (Mus. Brit.) 



Pl.ANOItmS KI.EGANTULUS. PhtJ.-sl,! <,hl!,iil'' cii/D/.n'.Wi?, 



pellucidd, corned, de.it rail, tintiitcr striata, siqjeriw 

 cotivexd, infra concavd ; spird parvd, anfractibus 

 t rib us, id f I mo lata, ad. aperturam oblique expanno; 

 aperturd pcruhliqiii' ovatd. 



The elegant Planorms. Shell obliquely compressed, 

 transparent, horny, destral, finely sti-iated, eon- 

 vex above, concave below ; spire small, whorls 

 three, last wide, obliquely expanded at the aper- 

 ture ; aperture very obliquely ovate. 



DiiHRN. Prop. Zo(]|. Soc. 18-">8, p. IS-t. 



Hab. ? 



Species 70. (Mus. Hanley.) 



Planokhis tkochoideus. Pla. testd twnidiilscidd, 

 letiiii, semipellucidd, subviridi, distanter concen- 

 trici' ulbofasctatd, auparne convexd, infra sub- 

 comylanatd, anxjiistissimi; umbilicatd, interne seg- 

 meidatd; spird. angitstissimd, ultimo atifractu 

 supernl: lati- v.i-jian^o ; infra, medimn anijidato, 

 acutii carinato. 



The tkochiform Planorms. Shell rather tumid, thin, 

 semipellucid, rather green, distantly concentri- 

 cally banded with white, convex above, rather 

 flattened below, very narrowly umbilicated, in- 

 ternally divided in segments ; spire very narrow, 

 last whorl broadly expanded above ; angular 

 below the middle, acutely keeled. 



Benson. Asiatic Society Bengal, 183f>, p. 7-12. 



Hab. Barrackpore. 



Remarkable for the way in which the outer whorl 



covers the inner, and the very small opening left in 



the centre of the upper and under discs. 



Species 71. (Mus. Brit.) 



Planorbis Moricandi. Pla. te.-<td sinistrali, tumidd, 

 ferrugined ; spird angustii iifitiidibtdatd, anfracti- 

 bus supra suturam angidatim elevatis ; ultimo 

 lite dedivi ; apertnrd trigond, infra medium sub- 

 angidatd, infra subrotundd; disco inferiori um- 

 hdicato. 



MoKiCANu's Planorbis. Shell sinistr.il, tumid, ferru- 

 ginous ; spire narrow, with narrow funnel-shaped 

 cavity, whorls raised angularly above the suture, 

 last broadly sloped ; aperture trigonal, rather 

 angular below the middle, a little rounded 

 underneath ; lower disc umbilicated. 



Beck. Adams, Genoi'a of Shells. 



Hah. ? 



A narrower shell than Planorbis tenagophilus, with 



the funnel-shaped opening more narrow and angulai-. 



Species 72. (Pig. a, h, c, Mus. Brit.) 



Planorbis multiyalvis. Pla. testd corned, siui.^trali. 

 altd; spird exsertd, subturritd; anfractibus s-c//- 

 tenis, superne angustatis angtdatis, ultimo coin- 

 pre.^so, alto, prope aperturam contracto turn 

 tumido, ad aperturam expanso ; aperturd eleratd, 

 margine expanso ; dism infrinri iin fundi: nndiili- 

 cato ; anfractibus rntimdi^, /rilnrx npicidihiis 

 obtectis. 



The mant-whorled Planorbis. Shell homy, sinis- 

 tral, high, spire exserted, subturreted ; whorls 

 seven, narrow and angular above, last compressed, 

 deep, contracted near the aperture, then tumid, 

 expanded at the aperture ; aperture raised, 

 margin expanded, lower disc deeply umbilicated : 

 whorls rounded, three apical hidden. 



Case. Adams, Genera of Shells. 



Uab. Lake Superior, Michigan. 



In the contraction and swelling of the last whorl 



near the mouth, and expansion of the lip, this shell 



resembles Planorbis camp(mulatus, but the whorls of 



the spire are more numerous and are pushed out 



conically. 



Species 73. (Fig. a, h, Mas. Brit.) 



Planorbis ferrugineus. Pla. testd tumidd, uenlri- 

 cosd, sinistrali, eastaneo-eorned; spird concavd, 

 anfractibus senis, subangtdatis, supra sidiirarn 



eh-i-iitis-, iifni angidum subdecliviliis-, idtiinn Into, 

 ijijin siilu'..in-._.C(l ; aperturd obliqn'' suhtrnjinid : 

 diar,, iiifniori late concavo ; avfrnctiluK siil,ro- 

 tandis. 



