54 NERITINA. 



\ Unfigured and undetermined Species of Theodoxus. 



N. Saulcyi, Bourg. Athens. 



N. Maroccana, Palad. (Figure inaccessible to me). Morocco. 



N. LURiDA, Jan. (Perhaps = Littorina obtusata, L,). Antilles. 

 N. EuxiNA, Clessin. Dobrudscha. 



Section Neritilia, Martens. 1879. 



N. succiNEA, Recluz. PI. 17, iig. 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. I. 

 N. coNsiMiLis, Martens. PI. 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. suecinea, but 

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

 parent, but appearing l)lack when the animal is enclosed. 



N. RUBiDA, Pease. PI. 17, fig. 84 ; PI. 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. Manoeli, Dohrn. PI. 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. PI. 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 



