82 Contributions to Indian Malacology. [No. 2, 



as republished in Otia Concliologica, p. 183, no mention is made of 

 the angulation of the periphery, which, however, is referred to by 

 Pfeiffer, (Mon. Helic. I. 8). The character is certainly variable : in 

 specimens in my own collection there is a considerable difference. 



Order,— PROSOBRANCHIATA. 



Family Cyclophoridos. 



Genus CYCLOPHORUS. 



24. C. (Lagocheilus) leporinus. 



Shell narrowly umbilicated, conically turbinate, thin, dark horny, 

 and ornamented throughout with oblique stri* and with raised spiral 

 lines, closer together at the periphery and within the umbilicus than 

 elsewhere. Spire conical ; apex rather acute. Whorls 5J, rounded ; 

 tin; last cylindrical, not descending. Aperture oblique, subcircular, 

 angulatc above ; peristome simple, thickened, subexpanded, incised at 

 the upper angle ; coluinellar margin curved backwards. Operculum 

 horny, greyish white, multispiral. 



Millem. inch. 



Major diameter, 4 0.16 



Minor ditto, 3| 0.14 



Axis, 4 0.16 



Habitat — Akoutoung, Pegu. 



This form is allied to Cyclophorus scissimargo, Bens., and C. tomo- 

 trema, Bens., forming with them the group for which Mr. Theobald 

 has proposed the name of Lagocheilus. There appears good reason for 

 associating these shells as a distinct subgenus, which perhaps repre- 

 sents, in Burma, the group of Cyclophori comprising C halophilus and 

 its allies in Southern India and Ceylon. The present species is 

 smaller and higher in the spire than either of the others. The animal 

 of C Itporinus is short, dark in colour, with small black tentacles, and 

 resembles ordinary Cyclophori in most characters. The only specimen 

 obtained living and examined, possessed, however, the peculiarity of a 

 groove down the middle of the caudal portion of the foot above. 



The peristome is simple in the only perfect adult specimen which I 

 possess, but in a broken barely adult shell, there is a rudimentary 

 duplication. The two lips are probably united in the full grown shell. 



