﻿PLANORBIS.— Plate IX. 



Thk ferruginous Planorbis. Shell tumid, ventricose, 

 sinistral, chestnut horn, spire concave ; whorls 

 six, rather angular, raised above the suture, 

 rather sloped below the angle, last broad, rather 

 convex below ; aperture obliquely subtrigonal ; 

 lower disc broadly concave, whoi-ls somewhat 

 lounded. 



Spix. Test. Braz. Tab. XVIII., f. 1--J. 



Huh. Brazil. 



The whorls are more angular above than is the 



case in Flanorbis oUvaeeus. 



Species 74. (Fig. «, b, Mas. Brit.) 

 Pr.ANOliBis Fuscus. Pla. testa dexfmli, depi-esmj'erni. 



ijiiied, superne convexiuscidd, infra late excavatd ; 



spird angustd; anfractihus trihus, ultimo lafo ; 



aperturd oblique mi(jiistatd, manjitie iutegro. 

 The Beown Planoebis. Shell dexfcral, depressed, 



iron-rust, rather convex above, broadly excavated 



below, spire narrow ; whorls three, last broad ; 



aperture obliquely narrow, margin entire. 

 DuNKER. Proc. Zool. Soc. 1848, p. 42. 

 Hi(h. Valparaiso. 



Species 75. (Fig. a, b, Mus. Brit.) 

 Plaxorbis NANU.S. Fla. tei'd pallide fulvd, dc.Hntli, 

 fompressd, supernh convexiHsculd, infra late et 

 profwnde umbilicatd ; spird nmjusitd, complanatd ; 



aiifnviUiHS tribus, oblique striatis, rapide creseenti- 

 bu.^, idtiino latissimo ; aperturd depressd, latissimd, 

 labia e.derno superne oblique producto. 



The DWARF Planorbis. Shell pale fulvous, dextral, 

 compressed, rather convex above, broadly and 

 deeply umbilicated below ; spire narrow, flat ; 

 whorls three, obliquely striated, rapidly in- 

 creased, last very broad; aperture depressed, 

 very broad, outer lip obliquely produced above. 



Benson. Proc. Zool. Soc. 1856, p. 186. 



Eab. India. 



Species 70. (Mus. Brit.) 



Planorbis modicus. Pla. testa corned, tumidd, siiii.')- 

 trali, spird liifuiidihiilatd ; iinfrartibtis quinis, 

 prope sittiirniii 'Icrafis d ainjidaliy, ultiiHO lato, 

 declivi, concciitrii-c tiuutter rinjald ; aperturd sid)- 

 triijottd, disco iiiferiori coneavo, anfractihus snb- 

 planuMis. 



The middling Planorbis. Shell horny, tumid, sinis- 

 tral, spire funnel-shaped ; whorls five, raised 

 and angular near the suture, last broad, sloped, 

 concentrically finely wrinkled ; aperture subtri- 

 gonal, lower disc concave, whorls rather flat. 



Benson. Adams, Genera of Mollnsca. 



Ilab. India. 



Belonging to the 

 but smaller, with i 

 excavation. 



p-oup as Flaiwibis carnem. 

 angular, fnnnel-like spiral 



