STYLODONTA. L87 



peristome tliin, expanded above, reflexed at the base, mar- 

 gins joined by ;i very thin callus. 



Syn. Oolumplica, Mouss. Pachya, Aiders. 



E.v. S. unidentata, Chemnitz, pi. 77, fig. 2. 



S. unidentata, S. cepoides, and -6?. Studeriana arc the 

 only species of this genus, as properly restricted, and are 

 from the Seychelles and the Philippines. Janira codo 

 nodes is from the Nicobar Islands, Erepta stylodon comes 

 from the Isle of France, and the other species are from 

 India. 



Species of Stylodonta. 



cepoides, Lea. unidentata, Chem 



Studeriana, Ferns. 



Sub-gen. janira, Albers. 



Shell umbilicate, globosely conoidal, last whorl constricted, 

 the base gibbous ; peristome thickened and reflexed, the coin 

 inellar margin with a dentiform protuberance, the external dilated 

 and sinuous. 



codonodes, Pfeiff. 



Sub-gen. erepta, Albers. 



Shell imperforate, rather depressed, solid, the last whorl sub- 

 angulated ; columella short, oblique, truncate, with a strong 

 tooth ; peristome simple, the basal margin somewhat thickened. 



albidens, Bens. suffulta, Bens. 



stylodon, Ferus. 



