﻿P L A N Pt B 1 S. 



Plate III. 



Spocies 17. -(Mus. Sowerby). 



Pl.AXciRBIS ALBUS. Fla. testa ptiUi'Ji.<sihhi. (hprrssi'i, 

 i-jiimliter lirk fenuibus hirsii lis "ninf'! ; • ' nfri r c t ilnis 

 paucis, ultimo maxima; niicrlnril I'hVnjni' pro- 

 duct I'l ; disco superiori leniicttlari, disoj inferion 

 coHcavo. 



The white Planokuis. Shell very pale, depressed, 

 s]iirally ornamented with thin hairy ridges; 

 whorls few, last very large; aperture obliquely 

 produced ; upper disc lenticular : lower di.sc 

 concave. 



MuLLEK. Drap. Moll. PI. I. fig. 45-48. 



Plnnorhis hi»ijidiis. Drapamaud. 



Hah. Britain, France. 



Species 18. (Mus. Sowb.) 



Planorbis armigeeiis. Pla. testa subdepressd, solidiiis- 

 cuh!, pallidii corned; anfractibus qtiinis, suhcom- 

 presgis, ultimo superm subcoiiiracto, supra avfractus 

 spirales elevato, versus aperturam dapresso ; disco 

 inferiori profundi: umldlicato ; aperturd declivi, 

 intii-S propo mnrginem incrassato, nvato. 



The ARMOUR-BEARING Planorbis. Shell rather de- 

 pressed, solid, pale homy; whorls five, rather 

 compressed, last rather contracted above, raised 

 above the spiral whorls, depressed towards the 

 aperture ; lower disc deeply umbilicated ; aper- 

 ture sloped, thickened within near the margin, 

 ovate. 



Sat. Hnkleman's Monograph, Pl. IV. f. 11-15. 



Ilah. New York. 



Species 19. (Fig. a, b, Mus. Sowerby.) 

 Planorbis shccineus. Pla. testa depressd, sticcined, 

 politd ; anfractibus quateriiis, snblente crescenti- 

 hus, apicalibus angustis, exteriio tumido ; disco 

 ivferiori late concavo, subcompla^vato ; apiciiurd 

 depressd, obliquii ovatd, angustd. 

 The amber Planorbis. Shell depressed, amber, 

 polished, whorls four, rather slowly increasmg, 

 apical ones narrow, last tumid ; lower disc widely 



concave, rather flattened ; aperture depressed, 

 obliquely ovate, narrow. 



SOWERRT. 

 llab. ? 



Two specimens are all I have seen of this pretty 

 little amber-coloured species. 



Species 20. (Fig. a, b, c, Mus. Brit.) 



Planorbis Rkdfieldi. Pla. testa pallidii fulvd, altd ; 

 anfractibus paucis, supra infrdque carinatis ; disco 

 superiori profundi; cxcavato, ultimo anfractu con- 

 vexo; disco inferiori profu-idissime umbilicato ; 

 apertnrd altissimd. supernii expansd, auriformi, 

 suirrd infrdque angtdatd. 



The eared Planorbis. Shell pale fulvous, high ; 

 whorls few, keeled above and below ; upper disc 

 deeply excavated, last whorl convex ; lower disc 

 very deeply umbilicated; aperture very high, 

 expanded above, auriform, angular above and 

 below. 



C. B. Adams. Conch. Contrib. p. '23. 



Hah. Jamaica. 



Species 21. (Fig. a, b, Mus. Sowerby.) 



Planorbis coarctati's. Phi. testa alia, pallidc stra- 

 tniiir,! : infiiictihiix quiiiis, compressis, snprd in- 

 )Wi,jin i-i'tninlr .1 ,,,jiihitis, medio convexis ; disco 

 miprrinri prnfi(nih'' r.crarato, disco inferiori com. 

 planato, anfractibus gradatim crescentibus, tdtimo 

 anfractu versus aperturam angustato, aperturd 

 angiistd, sidjovatd, margine pauVo cxpanso, intiis 

 coarctato. 



The contracted Planorbis. Shell high, pale straw; 

 whorls five, compressed, roundly angular above ; 

 convex in the middle ; upper disc deeply exca- 

 vated ; lower disc flattened, whorls gradually 

 increasing, last whorl narrow towards the aper- 

 ture ; aperture nai*row, rather oval, margin a 

 little expanded, narrow -ivithia. 



Sowekby. 



Eab. ? 



