26 ZONITID^. 



Borneo. N. laevipes^ Miill. (xciii, 86). Malabar. N. Janus^ 

 Chernii. (xciii, 81). Malacca. 



OXYTES, PfeifFer, 1855. Shell solid, obliquely striate or plicate, 

 depressed, carinate, umbilicate ; peristome expanded, thin, 

 edentulous ; columellar margin thickened. N. oxytes, Benson. 



ROTULA, Albers, 1850. (Pachystyla, Morch, 1852. Trocho- 

 morpha, Albers, partim.) Shell subperforated ; spire depi'essed 

 conical ; last whorl carinated at the periphery ; columella very 

 short, vertical; lip simple. 19 sp. Mauritius, India, East 

 Indies. 



PACHYSTYLA, Morcli (restricted), 1852. -A^. inversicolor, Fer. 

 (xciii, 89;. Mauritius. 



EREPTA, Albers, 1850. Shell with columellar tooth. N. sty- 

 lodon, Pfr. (xciii, 90). Maiiritius. 



c^LATURA, Martens. Shell spirally sculptured. 



CALDWELLiA, H. Adams. Shell small, fragile, translucent, 

 trochiform. JR. philyrina^ Morel. 



RHYSOTA, Albers, 1850. Shell rugosel}- striated above, polished 

 below ; the last whorl depressed, dilated anteriorly, excavated 

 around the umbilicus. N. monozonalis^ Lam. (xciii, 85). 

 Amboina. 



TROCHONANiNA, Mousson, 1869. (Martensia, Semper, 18T0.) 

 12 sp. East Africa, East Indies, Polynesia. N. Lychnia, Grray 

 (xciii, 88). Singapore. 



ziNGis, Martens. Shell heliciform, with a simple peristome ; 

 hinder extremity of the foot with mucous pore and a little 

 prominence above it ; jaw smooth, with median projection ; 

 marginal teeth of the raclula bicuspidate. N. radiolita, Martens. 

 Zanzibar. 



EUPLECTA, Semper. Shell striated or ribbed above. Cervical 

 lobes of the mantle developed, the left subdivided into two ; 

 shell-lobes rudimentary. 9 sp. Philippines. N. Boholensis, Pfr. 



GRPiELLA, Gra}^, 1855. Shell thin, rounded, depressed, with 

 four-and-a-half convex whorls, the last somewhat flattened 

 basally. Animal with the anal lappet of Nanina covering the 

 mucous pore, and six other smaller ones between this and the 

 shell, arranged in a double series along the back of the tail. 

 N. Scorpio, Grould. Fiji Islands. 



XESTA, Albers, 1850. (Xestina, Pfeiffer.) Shell perforate or 

 narrowly umbilicate, orbicularly depressed, smooth, usuallj^ 

 polished; aperture large, rounded ovate; margin acute; colu- 

 mellar margin dilated and reflexed. N. citrina, Linn, (xciii, 80). 

 Moluccas. 



BENSONIA, Pfeiffer, 1855. Not characterized. N. splendens, 

 Hutton. 



MACROCHLAMYS, Bcuson, 1832. (Tanychlamj's, Benson, 1834.) 

 Limited by Semper to the species of Nanina, the shells of which 



