﻿PLANORBIS.— Plate II. 



Planorhis luiescens. Lamarck. 



Hob. Britain and other parts of Europe. 



Resembling Planorhis marginatus, but with outer 

 whorls wider, and the keel planed more towards the 

 middle of the whorls. 



Species 13. (Fig. a, h, Mus. Brit.) 



Planoebis voetex. Pla. testa depressd, utrinque com- 

 planatd; anfractibus oetavis, angustissimis, lente 

 crescentibus ; disco superiori subexcavato, inferiori 

 paulo convexo, anfractibus angiiste prope suturam 

 elevatis. 



The vortex Planokbis. Shell depressed, flattened 

 on both sides ; whorls eight, very narrow, slowly- 

 increasing; upper disc a little hollow, lower a 

 little convex, with whorls narrowly raised near 

 the suture. 



LiNNa;us. {Helix) Systema Natura3. 



Planorbis compressns. Michelet. 



Hah. Europe generally. 



Species 14. (Fig. a, h, Mus. Sowerby.) 

 Planorbis spirorbis. Pla. testa, compressd ; anfracti- 

 bus senis, lente crescentibus, supernh angustiorihus ; 

 disco siiperiori angustiori, planulato ; disco infv- 

 riori concavo ; apeHurd supra anfractum idtimnm 

 elevatd ; infm productd, rotimdd. 

 The spiRORiiiis Planoebls. Shell compressed ; whorls 

 six, slowly increasing, narrower above ; upper 

 disc narrower, flattened ; lower disc concave ; 

 aperture raised abo^e the last whorl, produced, 

 i-ounded below. 



Mullee. Verm., Test, ct Fluv. p. 161. No. 34-" 

 Hah. Britain, France. 



Species 15. (Fig. a, h, Mus. Sowerby.) 



Planoebis nitidds. Pla. iestd compressd, suceined, 

 medio obtuse angulatd, supra infrdque fer'e cequa- 

 liter convexd ; ultimo anfractu tnaximo ; disco 

 spirali contraeto, planato, anfractibus intern is 

 angustis ; disco inferiori late excavato. 



The neat Planoebis. Shell flattened, amber, obtusely 

 angular in the middle, almost equally convex 

 above and below : last whorl very large ; spiral 

 disc contracted, flattened, with narrow inner 

 whorls ; lower disc broadly excavated. 



Mi-LLEK. Drap. Moll. PI. 2, f. •20-22. 



Hah. Britain, France. 



Species IG. (Fig. (f, b, Mus. Sowerby.) 



Planoebis lacusteis. Pla. testd compressd, ■ 



interne divisd, lineis ruhris distantibus, ohliquit 

 concent rids r.riii.i mdatd; superne subconicd ; spird 

 minihi:! : mrJia snl, acute, angulato, infra angulum 

 plannhitn, imihiliniio. 



Tub lake Planohbis. Shell compressed, amber, 

 internally divided, externally marked by distant 

 obliquely concentric red lines ; somewhat conical 

 above ; sj)ire very small ; middle rather sharply 

 angular, flattened below the angle, umbilicated. 



LiGETFOOT. ? Brit. Moll. 



Seginentina Ihieata. ? 



Bab. Ponds and ditches in Enslaud. 



