﻿P L A N R B I S. 



Plate XIV. 



Species 114. (Fig. a, h, Mus. Brit.) 



Planokhis defokmis. Pla. testa parvd, cinereo-ferru. 

 gined, comjiJanatd, dextrali ; spird planulatd ; 

 aiifractihiis quateniis, tumidis, suhrottmdis ; ultimo 

 versus aperiuram ■irreijulariter tnmido, ad mar- 

 ginem expanso; aperturd arcuatim-conicd, an- 

 fractum ultimnm supra infrdque superante ; disco 

 iiiferiorl ad marginem phmidato, medio concavo. 



The deformed Planokbis. Shell small, rusty-grey, 

 flattened, dextral ; spire flattened, whorls four, 

 tumid, rather rounded, last irregularly swelled, 

 e.xpanded at the margin ; aperture curved- 

 conical, extending above and below the last 

 whorl ; lower disc flattened at the margin, con- 

 cave in the middle. 



Laiiakok. Anim. sans Vert. 



Hah. r 



The last whorl becomes tumid a little way before 



the expansion of the aperture. 



Species 115. (Fig. n, h, Mus. Brit.) 



Planorbis ALEXANDEraus. Fla. testd dextrali, sub- 

 cnmpressd, fulvd, anfractibus quaternis, ultimo 

 latiiisculo, medio tumido, infra subangustato ; 

 aperturd subtrigond, dentibus quints laminatis 

 Icmge internis armatd ; margins intus inerassato ; 

 disco inferiori late nnihilicato. 



The Alexandrine Pl.^noreis. Shell dextral, rather 

 compressed, fulvous, whorls four, last rather 

 wide, middle tnmid, rather narrow below ; aper- 

 ture subtrigonal, armed far back internally with 

 five teeth ; margin thickened within ; lower disc 

 broadly umbiHcated. 



Ehrenbeeg. Roth. Moll. Sp. PI. II. f. 8. 



Genus, Planorbula. Haldeman. 



Hah. Egypt. 



This species belongs to the section which has been 



separated under the generic name of Flanorbula. 



Far back in the throat may be seen laminated plates 



jutting out so as to contract the opening. 



Species lUl (Mus. Brit.) 



Planoebis dentatus. Pla. testd de.vtrali, compressd, 

 fulvd, spird planiiiscidd ; anfractibus convexis, 

 supeme latis, infra medium angustatis, disco supe- 

 riori lato, disco infn-iori angvstnto, profimdr et 

 anguste excavato; (ijurliir,! nnnjii:!. iufni uufrnrtiiiu 

 ultlmumproductd , hnuji' intin; liiiiiiniiliiii Iridrntafd, 

 margine intiis incrassufo. 



The toothed Planoebis. Shell dextral, compressed, 

 fulvous, spire rather flat ; whorls convex, broad 

 above, narrow below the middle, upper disc 

 broad, lower disc narrow, deeply and narrowly 

 excavated ; aperture large, produced below the 

 last whorl, with three laminar teeth far within, 

 margin thickened within. 



DcNKER. (Planorbula) ? Adams' Gen. of Moll. 



Hab. — -? 



Species 117. (Fig. a, h, Mus. Brit.) 



Planoebis albicans. Pla. testd albidd, solidiitsculd, 

 dextrali, spird planulatd ; anfractibus ccmvexii'is- 

 culis, quaternis, moderate crescentihus, ultimo ad 

 aperturam valde deflexo, disco inferiori angidatim 

 excavato ; aperturd usque ad murginem inferiorem 

 ultimi anfradils dcpressd. 



The whitish Planoebis. Shell whitish, rather solid, 

 dextral, spire rather flattened ; whorls four, 

 rather convex, moderately increased, last much 

 bent down at the aperture, lower disc angularly 

 convex ; aperture bent down to the lower margin 

 of the last whorl. 



Pfeiffer. 



Hah. Lima. 



Species 118. (Fig. a, h, Mns. Brit.) 

 Planoebis compeessus. Pla. testd compressd, latiils- 

 culd, pallidd, Icevigatd; dextrali, supeme angustatd, 

 infra lata, subcarinatd, spird depressd; aperturd 

 oblique pyramidatd, supeme angustatd, margine 

 inferiori producto. 



