54 NERITINA. 



Unfigured and undetermined Species of Theodoxus. 

 N. SAULCYI, Bourg. Athens. 



N. MAROCCAXA, Pa-lad. (Figure inaccessible to me). Morocco. 



IS". LURIDA, Jan. (Perhaps = Littorina obtusata, L.). Antilles. 

 N. EUXINA, Clessin. Dobrudscha. 



Section NERITILIA, Martens. 1879. 



N. SUCCINEA, Kecluz. PL 17, fig. 83. 



Obliquely elliptical, striulate, thin, yellowish, or yellowish cor- 

 neous ; columellar area plane, very slightly rugulose, margin eden- 

 tulous. Diam. 3*3-4'5 mill. 



Guadeloupe, W. L 

 N. CONSIMILIS, Martens. PL 18, fig. 86. 



Obliquely elliptical, slightly, closely striulate, a little shining* 

 diaphanous, corneous yellow, spire blackish ; columellar area slightly 

 convex, and faintly rugulose, blackish, margin edentulous. 



Diam. 3'3 mill. 



Mauritius. 



The shell is scarcely distinguishable from that of N. nuccinea, but 

 the operculum of the former is reddish, that of consimilis trans- 

 parent, but appearing black when the animal is enclosed. 



N. RUBIDA, Pease. PL 17, fig. 84 ; PL 18, fig. 85. 



Transversely ovate, thin, translucent, lightly striulate, yellowish 

 corneous, usually more or less incrusted with black (epidermal ?) ; 

 columellar area nearly plane, ash-colored, margin edentulous. 



Diam. 5 mill. 



Central Polynesia. 



N. ossea, Garrett, is a synonym. 



N. MAXOELI, Dohrn. PL 18, fig. 87. 



Obliquely turbinate, lightly striulate, thin, corneous yellow, 

 partly incrusted with black (epidermal ?) ; columellar area yellowish 

 white, margin straight, edentulous. Diam. 4 mill. 



Prince's IsL, W. Africa. 



Section SMARAGDIA, Issel. 1869. 



N. VIRIDIS, Linn. PL 18, fig. 88. 



Obliquely ovate, dorsally compressed, smooth, shining, bright 

 green, varying to yellowish green, more or less interruptedly stri- 

 gate or maculate with white, or sometimes with black ; columellar 



