PTEROCYCLOS 



Plate III. 



Species 11. (Mus. Benson.) 



Pterocyclos cetk.\.. Pter. lestd sublati aperte innbili- 

 catd, siibdiscoideil, fulvo-albidd, rufo-fusco arcualo- 

 maculatd, anfractibus angustis, rotundatis, tenuistri- 

 atis ; aperturd parvd, una brevi, labro purum dila- 

 tato. 



The buckler Pterocyclos. Shell rather broadly 

 opcnlj' urabilicated, subdiscoid, fulvous-white, arcu- 

 ately blotched with red-brown, whorls narrow, 

 rounded, finely striated ; aperture small, sinus short, 

 lip but little dUated. 



Benson, Ann. Nat. Hist. ser. 2, vol. xvii. p. 228. 



Hah. Moulmcin, India. 



Very like V. nanus which follows, but more discoid 

 and more broadly umbilieated, with the lip less flexuously 

 dilated over the sinus. 



Species 12. (Fig. «, b, Mus. Benson.) 



Pterocyclos nanus. Ptfr. testa aperte umbilicatd, sub- 

 discoided, pallide fiilvd, ad peripheriam rufo-fusco 

 lineari-fasciatd, supra arcuato-maculaid, anfractibus 

 angustis, rotiindatis, tenuissime slriatis ; aperturd 

 parvd, sinii tumidejlexuoso-dilatato. 



The dwarf Pterocyclos. Shell openly umbilieated, 

 subdiscoid, light fulvous, linearly banded with red- 

 brown at the periphery, arcuately blotched above it, 

 whorls narrow, rounded, very finely striated ; aperture 

 small, sinus tumidly flexuously dilated. 



Benson, Ann. Nat. Hist. vol. viii. p. 450. 



Hab. Neilgherry Hills. 



A small species, in which the wing-like dilation of the 

 lip is flexously swollen and bent forwards, somewhat after 

 the manner of P. rupestris and Albersi. 



Species 13. (Fig. a, b, Mus. Cuming.) 



Pterocyclos bilabiatus. Pter. testd ampliter sub- 

 e.rcarato-umbilicatd, vix discoided, albidd, rufo-fusco 

 vndato-strigatd et fusciatd, anfractibus rolundatis, 

 dense striatis ; aperturd obliqud, labro peculiariler 

 nudato-crispato, ad sinus tumido-cucullato. 



The two-lii-ped Pterocyclos. Shell largely some- 

 what excavately umbilieated, scarcely discoid, whitish, 



wave-streaked and banded with red-brown, wiiorls 

 rounded, closely striated ; aperture oblique, lip pecu- 

 liarly crimped, tumidly chambered over the sinus. 



Benson, Zool. Journ. 1834, vol. v. p. 462. 

 Cjjclostoma bilabiatum, Sowerby. 



Hab. Salem, near Madras. 



Eemarkal)ly distinguished by a peculiar crimping of the 

 lip. 



Species 14. (Fig. a, b, Mus. Cuming.) 



Pterocyclos Cumingii. Pter. testd latissime peraperti 

 umbilicatd, discoided, fulvescente-albd, castaneo un- 

 dique undato-strigatd, anfractibus angustis, rotundatis, 

 tenue annulato-striiitis ; aperturd oblique circulari, 

 labro calloso-rejlexo, sinu conspicue flexuoso-uuriculato . 



Cuming's Pterocyclos. Shell very broadly, very openly 

 umbilieated, discoid, fulvous-white, sharply waved 

 throughout with chestnut, whorls narrow, rounded, 

 finely ring-striated ; aperture obliquely circular, lip 

 callously reflected, sinus conspicuously flexuously 

 auriculated. 



Pfeiffer, Zeitschr. fiir Malac. 1S51, p. 4; Pro. Zool. 

 Soc. 1852, p. 158. 

 Pterocyclos (Jingalensis, Benson. 



Hab. Ceylon. 



A depressly discoid, very opeidy umbilieated species, 

 exquisitely painted in a zigzag manner throughout. 



Species 13. (Fig. a, b, Mus. Benson.) 



Pterocyclos parvus. Pter. testd late umbilicatd, sub- 

 discoided, fulvo-albidd, rufo-castaneo fasciatd et uu- 

 dato-slrigatd, anfractibus rotundatis, rude striatis ; 

 aperturd oblique circulari, sinu tumido-auriculato. 



The small Pterocyclos. Shell broadly umbilieated, 

 subdiscoid, fulvous-white, banded and wave-streaked 

 with reddish chestnut, whorls rounded, rudely stri- 

 ated ; aperture obliquely cii'cidar, sinus tumidly auri- 

 culated. 



Spiraculmn. parvum, Pearson, Journ. Asiat. Soc. 1833, 

 p. 392. pi. 20. 

 Pterocyclos parvus, Benson. 

 Cgclostoma spiraculmn, var., Sowerby. 



Hab. Khasia Hills. 



February, 1863. 



