196 



HELICINiE. 



Sub-gen. geotrochus, Van Hasselt. 



Shell imperforate, or with the umbilicus covered, trochiform 

 or conoidal, last whorl keeled or angulated ; aperture very ob- 

 lique, angulated ; peristome simple, the upper margin expanded, 

 rarely, reflexed, the basal dilated and reflexed. 



antiquatus, Adams and 



Reeve. 

 euchroes, Pfeiff. 

 Ferussaci, Less. 

 labium, Ferus. 

 lentus, Pfeiff. 



lituus, Less. 

 lonchostoma, Mke. 

 Macgillivrayi, Forbes. 

 pileiformis, Moric. 

 pileolus, Ferus. 

 pileus, Miill. 



Genus COCHLEA, Adanson. 



Shell imperforate, or, very rarely, sub-perforate, depressly 

 globose, rugulosely marked ; whorls 4 5, the last ante- 

 riorly deflexed ; aperture very oblique, lunately oval ; peri- 

 stome thickened, the margins parallel or approximate, often 

 joined by a callus, the superior expanded, the basal rather 

 straight, dilated and tuberculated. 



Syn. Mycena, Albers. Otala, Beck, not Schum. He- 

 micycla, Swains. Leptaxis, Lowe. 



Ex. C. Adansonii, Webb and Berthelot, pi. 77, fig. 7. 



The Canary Islands, Teneriffe, the West Indies, and the 

 West Coast of Africa, are the countries inhabited by this 

 group. 



Species of Cochlea. 



Adansonii, Webb and Berth. 

 advena, Webb and Berth. 

 consobrina, Ferns. 

 Desfontanea, Morel. 



iiuctuosa, Lowe. 

 furva, Lowe. 

 Gaudryi, IX Orb. 

 malleata, Ferns. 



