PTEROCYCLOS 



Plate V. 



Species 23. (Miis. Cuming.) 



Pterocyclos Bernardii. Pier, testa am.pUter nmhill- 

 catd, snbdiscoided, fulvescente, anfnictihus rotniidnlin, 

 tenue aiinulato-striatis ; aperliird circidari, labro 

 erassi reflexo, siitu in tnbidum parvum htcurmim pro- 

 duct o. 



Beknardi's Pterocyclos. Shell largely umbilicated, 

 somevvhat discoid, fulvous, whorls rounded, finely 

 ring-striated; aperture circular, lip thickly reflected, 

 sinus produced into a small incurved tube. 



Pfeiffer, MS. in Mus. Cuming. 



Huh. ? 



Of simple form and semitransparent fulvous colour, with 

 a small incurved tubular sinus. 



Species 24. (Mus. Cuming.) 



Pterocyclos tubuliferus. Pter. testa late aperte iim- 

 bilicatu, snbdiscoided, fidvescente, riifo-fnsco mariiio- 

 ratd, anfractibus rolundatis, dense tennislriati-i ; 

 aperturd oblique circidari, labro duplicato, concavo- 

 dilatuto, siiiu in tiibiilvm minutuw prodnrto. 



The tube-bearing Pterocyclos. Sliell broadly openly 

 umbilicated, subdiscoid, fulvous, mottled with red- 

 brown, whorls rounded, closely finely striated ; aper- 

 ture oldicpiely circular, lip duplicate, concavely di- 

 lated, sinus reduced into a minute tube. 



Cyclostoma tubidiferiim, Pfeiti'er, Pro. Zool. Soc. 18.53, p 

 51. 



Cyclotus tubuUferns, Pfeiffer. 

 Opisthoporus tubuliferus, Benson. 



Hab. ? 



The tubular sinus is smaller in this species than in any 

 other, almost concealed from view within tiie sutures. 



Species 25. (Mus. Cuming.) 



Pterocyclos eostellatus. Pter. testa modice e.Tca- 

 vato-umbilicatd, subdiscoided, f/dvd, rufo-fusco wndato- 

 marmoratd, anfractibus rotundatis, temiistriatis, an- 

 fractu ultimo tubulo miniito erecto pone uperturavi ; 

 aperturd circulari, labro expanso-rejiexo . 



The beaked Pterocyclos. Shell moderately exca- 

 vately umbilicated, subdiscoid, fulvous, wave-marbled 



with red-brown, whorls roimded, finely striated, last 



whorl with a small erect tube behind the aperture; 



aperture circular, lip expandedly reflected. 

 Cyclostoma rostellatmn, Pfeitt'er, Zeitschr. fiir Malak. 1851, 



p. 8. 



Cyclotus rostellatus, Pfeiffer. 



OpisUioporus rostellatus, Pfeili'er. 

 Hab. ? 



In this species, which is less openly convoluted, the 

 minute tube, accidentally omitted in our figure, is a little 

 removed from the aperture. 



Species 2G. (Pig. a, b, Mus. Cuming.) 



Pterocyclos hispidus. Pter. testd latisume peraperti 

 umbilicald, plano-discoided, solidd, fdvd, snperne us- 

 iulato-fusco tincld et marmoratd, anfractibus rotuu- 

 datis, spiraliter mKlliliratis, concenlrice dense striatis, 

 epidermide Jmpiduld indutis, anfractn ultimo tubulo 

 recurno subremote pone aperturam ; aperturd oblique 

 circulari, labro dense calloso-reflexo, sinu late am/n- 

 late eontinuo-producto. 



The hairy Pterocyclos. Shell very broadly verv 

 openly umbilicated, flatly discoid, solid, fulvous, 

 stained and marbled at the upper part with burnt 

 brown, whorls rounded, spirally many-ridged, concen- 

 trically closely striated, covered with a slightly hairy 

 epidermis, last whorl with a recurved tube at some 

 distance behind the ajierture; aperture obli{piely cir- 

 cular, lip thickly callously refiected, sinus broadly 

 angularly continuously produced. 



Spii-aculum hispidum,. Veavson, Journ. Asiat. Soc. 1853, 

 p. 391. pi. 20. 



Cyclostoma spiraculitm, Sowerby. 

 Steyanotoma Princepsi, Von dem Busch. 

 Pterocyclos hispidus, Benson. 

 Pterocyclos Princepsi, Pfeift'er. 



Hab. Khasia Hills, India. 



This is the only species of the genus in which there is 

 any close well-defined spiral sculpture ; and the recurved 

 tube at a point of the suture removed from the aperture, 

 characteristic of the group Opisthoporus, is here combined 

 with the produced angular sinus chiefly typical of Ptero- 

 cyclos proper. 



Febmarv, 1863. 



