222 STENOPIDiE. 



Species of Stenopus. 

 cruentus, Guild. lividus, Guild. 



Genus NANINA, Gray. 



Mantle with the front edge produced and divided into two 

 movable lobes, which partly cover the shell. Foot truncate, 

 and glandular at the end ; sole as wide as the foot. 



Shell perforate, depressed, thin, polished, granular or 

 corrugately striated ahove, smooth and polished beneath ; 

 aperture lunar ; peristome the thickness of the shell, 

 straight, the columellar margin short, reflexed, often cover- 

 ing the umbilicus. 



Syn. Xesta, Albers. 



Ex. N. regalis, Benson, pi. 79, fig. 5. Shell, N. 

 citrina, Linnaeus, fig. 5, a. 



The species of this genus inhabit Southern Asia and the 

 islands of the Indian Ocean ; Java, the Philippines, Molucca, 

 New Ireland, and Ceylon, are the countries of Byssota, 

 Hemiplecta, and Nanina proper ; while the islands in the 

 Pacific Ocean, the Society Islands Pitcairn's Island, and 

 Opara, harbour the species of Microcystis ; Macrochlamys 

 is from Guinea and Bengal ; and Cysticopsis and Pachys- 

 tyla are from Cuba and Bermuda. They live in thick shady 

 woods, crawling with great vivacity among the leaves, and 

 moving faster when disturbed; they secrete a green fluid for 

 their defence when irritated. 



Species of Nanina. 



bistrialis, Beck. cinnamomea, Valenc. 



Casca, Gould. citrina, Linn. 



ceratodes, Pfeifi- filocincta, Pfeiff. 



