278 CYCLOPHOftlNyE. 



Sub-gen. spiraculum, Pearson. 



Shell with a reverted, closed tube or spiracle, situated on the 

 suture near the aperture. 



hispidus, Pearson. 



Genus ALYC2EUS, Gray. 



Operculum circular, sub-testaceous, obsoletely many- 

 whorl ed. 



Shell conical or depressed; spire regular, suture deep, 

 with a retroversal callus, last whorl distorted, compressed and 

 contracted behind the aperture ; aperture circular, peristome 

 regularly reflexed. 



Ex. A. gibbus, Fermsac, pi. 85, fig. 4. Operculum, 

 A. gibbus, fig. 4, a, 4, b. 



The head-quarters of this small but peculiar group appear 

 to be India, three species being found in the Sikkirn Hima- 

 laya; the A. gibbus is from Cochin-China, and A. spira- 

 cellum is from the Island of Borneo. 



Species of Alycceus. 



constrictus, Bens. strangulatus, Hutton. 



gibbus, Ferns. urnula, Bens. 



spiracellum, Adams and Reeve. 



Sub-fam. CYCLOPHOKIN.E. 



Operculum horny, thin, without any external shelly layer ; 

 orbicular, of many very gradually- enlarging whorls; nucleus 

 central. 



