﻿PLANORBIS.— Plate V. 



Species 40. (Fig. a, h, Mus. Brit.) 



Planorbis brunneus. Pla. testa, siibglobosd, altd, Icevi, 

 ferrngined, spird parvd, anfraetihus iribus, superne 

 contractis, supra suturam, elevatis, subangulatig, 

 turn rotundis, medio wflatis ; disco inferiori an- 

 guste umbiUcato, aperturd sainilunari, infra pro- 

 ductd, expansd. 



The brown Planorbis. Shell snbglobose, high, 

 smooth, forruginons, spire small, whorls con- 

 tracted above, raised, a little angular above the 

 suture, then rounded, inflated in the middle ; 

 lower disc narrowly umbilicated ; aperture semi- 

 lunar, produced and expanded below. 



Gray. Adams. Genera. 



Hah. Bumbay. 



Species 41. (Fig. a, b, Mus. Brit.; 



Planorbis Macnabianus. Pla. testa tenuissimd, pellii- 

 cidd, suceitied, utrinque pilanulatd, compressissimd ; 

 anfractibus septenis, lentissime crescentlbus, aper- 

 turd subrhomboided; infra atigulatd. 



Macnab's Planorbis. Shell very thin, pellucid, amber, 

 flattened on both sides, very compressed ; whorls 

 seven, very slowly increased ; aperture snbrhom- 

 boidal, angular below. 



Adams, C. B. Conchological Contributions, p. 42. 



Hab. Jamaica. 



Species 42. (Mus. Brit.) 



Planorbis t^niatus. Pla. compressd, dextrd, pallide 

 owned; spird parvd, anfraetihus quaternis vel 

 quinis, internis tribus angustissimis, ultimo tumido, 

 latimculo, utrinque rotiindato ; medio fasciato, 

 aperturd oblique oblongd. 



The riband Planorbis. Shell compressed, dextral, 

 pale horny ; spire small, whorls four or five, 

 inner three very narrow ; last tumid, rather 

 broad, rounded on both sides, banded in the 

 middle, aperture obliquely oblong. 



MoRELET. Adams. Genera. 



Hab. Isle of Pines. 



Species 43. (Fig. k, b, Mus. Brit.) 

 Planorbis stag:<icola. Pla. testa dextrali, complanatd, 



olivaced, minutissime liratd, supei'nh convexiiisculd, 



anfractibus tribus, rapidb crescentibus, ultimo l-ato; 



aperturd oblique subovatd ; disco inferiori concavo, 



anfractibus conspicuis, planulatis. 

 The still-water Planorbis. Shell dextral, flattened, 



olive, very finely ridged ; rather convex above ; 



whorls three, quickly increasing, last broad ; 



aperture obliquely subovate ; lower disc concave, 



whorls conspicuous, flattened. 



Morelet. ? Adams. Gen. of Shells. 



Hab. ? 



Very like Planorbis alb us in form, but of a dark 

 gi-een colour, and finely wrinkled. 



