50 BOOK OF SPECIES. 



the last whorl crowned in the upper part with 

 long erect spines ; apex eroded ; lip denticulated ; 

 diam. i. W. 35. 22. 



N. STRIGILATA. Oblong-veutricose^ smooth, 

 shining, with alternate yellovv and black longi- 

 tudinal streaks ; spire exserted, acute ; aperture 

 white; lip denticulated; whorls three, without 

 the point; diam. J. W. 36. 38. 



N. viRGiNEA. Ovate-globose, smooth, shining, 

 spotted, and frequently banded ; colours various ; 

 spire shortish; lip denticulated; the general shape 

 approximates somewhat to N. strigilata; diam. f . 

 W. 36. 37. 



N. FLUviATiLis. Small, oval, back convex, 

 glabrous, tessellated with various-coloured spots; 

 whorls three ; spire inclined la,teral ; lip entire ; 

 diam. J. B. T. 124. 



N, viRiDis. Minute, oval, back convex, 

 smooth, pellucid ; green, often spotted with white; 

 spire lateral ; lip denticulated. W. 36. 36. 



N. PUPA. Ovate-globose, smooth, white, with 

 deep black undulated or reticulated lines ; yellow 

 within ; aperture semi-lunate ; lip scarcely in- 

 flected, obsoletely denticulated. ^. W. 36. 33. 



NERITA. 



Solid, semi-globose, flattened below, without an um- 

 bilicus; aperture semi-circular and entire; inner 



