26 ZONITIDA. 
Borneo. N. levipes, Mull. (xciii, 86). Malabar. WN. Janus, 
Chemn. (xciii, 87). Malacca. 
OXYTES, Pfeiffer, 13855. Shell solid, obliquely striate or plicate, 
depressed, carinate, umbilicate; peristome expanded, thin, 
edentulous ; columellar margin thickened. N. oxytes, Benson. 
RoTULA, Albers, 1850. (Pachystyla, Moérch, 1852. Trocho- 
morpha, Albers, partim.) Shell subperforated ; spire depressed 
conical; last whorl carinated at the periphery ; columella very 
short, vertical; lip simple. 19 sp. Mauritius, India, East 
Indies. 
PACHYSTYLA, Morch (restricted), 1852. N. inversicolor, Fer. 
(xciil, 89. Mauritius. 
EREPTA, Albers, 1850. Shell with columellar tooth. WN. sty- 
lodon, Pfr. (xciii, 90). Mauritius. 
CALATURA, Martens. Shell spirally sculptured. 
CALDWELLIA, H. Adams. Shell small, fragile, translucent, 
trochiform. &. philyrina, Morel. 
RHySOTA, Albers,1850. Shell rugosely striated above, polished 
below ; the last whorl depressed, dilated anteriorly, excavated 
around the umbilicus. NN. monozonalis, Lam. (xciii, 85). 
Amboina. 
TROCHONANINA, Mousson, 1869. (Martensia, Semper, 1870.) 
12 sp. East Africa, East Indies, Polynesia. WN. Lychnia, Gray 
(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 radula 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. NN. Boholensis, Pfr. 
ORPIELLA, Gray, 1855. Shell thin, rounded, depressed, with 
four-and-a-hiulf 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, Gould. Fiji Islands. 
XESTA, Albers, 1850. (Xestina, Pfeiffer.) Shell perforate or 
narrowly umbilicate, orbicularly depressed, smooth, usually 
polished ; aperture large, rounded ovate; margin acute; colu- 
mellar margin dilated and reflexed. NV. citrina, Linn. (xciii, 80). 
Moluccas. . 
BENSONIA, Pfeiffer, 1855. Not characterized. N. splendens, 
Hutton. 
MACROCHLAMYS, Benson, 1832. (Tanychlamys, Benson, 1834.) 
Limited by Semper to the species of Nanina, the shells of which 
