MOLLUSCA OK INDIA, 10 



Lagocheilus, Theobald, MS., see W. T. Blf. A. M. N. H. xiii. (1864) 



p. 452, Group I. ; J. A, S. B. 1872, p. 269. — Type scisslmargo, 



Benson : Tenasserim. (Conch. Ind. pi. vi. fig-. 7.) 



Original description : — " Testa avguste umbilicata, turhinato- 



conica, parva, spiraliter lirata, epidermide fusca (in exemplis juni- 



oribus scppe hispidida) imhiia. Peristoma incrassatum, auperne ad 



angulum rima transversa breviter incisum. Operculum planum, 



tenue, albidum.'" 



LeptojJoma, PfeifFer, Zeit, f. Malak. p. 108 (1847). — Type acumina- 

 tum, Sow. : Luzon. 

 Original description : — " Opere. membranacevm, arctisiArum, pla- 

 num. Testa globoso-turbinata vel conica, anguste umbilicata. Perist. 

 simp)lex, rejiexum, marginibus distantibus, interdum callo teauissimo 

 junctis." 1. ecarinata and 2. carinata. 



Cyclophokus, Montfort. 



Gray (Cat, Phanerop. B. M, p. 35, 1852) divides the genus into 

 two main groups based on form of the shell alone, and the very 

 tjpical Indian species, such as himalaganus (Conch. Ind. pi. xsxiv. 

 fig. 4) near C. aurora, and siameiisi.-'<. &c., head the list. 



Blainv. in Diet. Sc. Nat. xii. p. 290, 



Blainv. Malac, p. 435. 



Desh. in Encycl. Meth. ii. p. 236. 



Pfr. in Z. f. M. pp. 47-107 (1847). 

 Do. p. 138 (1851). 



Pfr. Consp. p. 10. 



Gray in P. Z. S. p. 182 (1847). 



Gray, Cat. Cycl. p. 15. 



Pfr. Pucum. Mon. p. 54 (1858). 



" Operculum corneum, tenue, arctisp/irum , e.rtus magis miansve 

 concavum. Testa globoso-turbinata, depressa vel dlscoidea ; peristoma 

 continuum, expandum vel rectum..''^ 



H. & A. Adams, Gen. Rec. Moll. p. 279, pi. Ixxxv. figs. 5, 5 a. 5 b 

 (1858). 



C. tigrinus. Sow., with operculum is here figured as a typical 

 species together with C. involvidus, Miiller, fig. be. ( Vide Conch, 

 Ind. pi. ii. fig. 3 : Ceylon.) 



V. Martens, Die Preuss. Exped. Ost-Asien, p. 130 (1867). 



The genus is here divided into seven groups according to the form 

 of the shell, usefiil for purposes of identification. 



In ' Zoological Journal,' vol. v. p. 4(52, Mr. W. H. Benson describes 

 the animal of C. involvulus. Gray, MS. * (thus identified by Sowerby 

 in 1834, afterwards described by Benson in A. M. N. H. 2nd ser. 

 vol, xiv, p. 412 as C pyrotrema) : — " I found this beautiful species 

 alive on the rocks of Sicrigully and among loose brick rubbish 

 and under felled timber in the fort of liajmahal on the 16th 



* Probably the first notice of the animal of an Indian species of Cyclophurtis, 

 and pointing out how it differs from that of Cyclostoma. 



c2 



