Descriptions of New Species of Helicida. 15 



lower half of the last whorl ; covered with a thin yellowish or 

 brownish epidermis ; spire conical, rather obtuse ; whorls five, 

 somewhat convex, the last equalling f of the total length; 

 columella with a strong oblique fold, which is so sharply defined 

 on its upper side as to form a distinct canal ; aperture oval- 

 oblong ; peristome reflected, reddish purple. 



Length, 1.55 inch (40 millim.). Breadth, 0.82 inch (22 

 millim.). 



Length of aperture within, 0.90 inch (23 millim.). Breadth 

 of do. 0.45 inch (12 millim.). 



A smaller variety occurs more rarely, in which the epider- 

 mis is of darker color, and the spots are sometimes entirely 

 wanting. 



Habitat. District of San Fernando, in the island of Trinidad, 

 400 feet above the sea, where it was found by Mr. MacMurray 

 on the ground in woods among moist vegetation, on rich yellow 

 spongy soil, not rocky. One example was also found in the 

 neighborhood of the penal settlement, situate at the junction of 

 the Massaroony and Essequibo rivers, Demerara, during Mr. 

 MacMurray's visit to that place.- 



Remarks. Belongs to the group of which B. pudicus, B. 

 auris-sileni, B. malleatus, B. fulguratus are representatives, and 

 for which Guilding proposed Plekocheilus as a subgeneric title. 

 It also somewhat resembles B. pulicarius Gray, in form and 

 coloration, but differs in sculpture and in the character of the 

 columellar plait, and cannot easily be confounded with that or 

 any other known species. 



2. Biilimus Siamensi. 



Testa sinistrorsa, rimato-perforata, ventricoso-conica ; tenui, oblique 

 minute striata, cornea ; spira conica, subacuta ; anfractibus 7, convex- 



