90 BOOK OF SPECIES. 
the last whorl crowned in the upper part with 
long erect spines ; apex eroded; lip denticulated ; 
diam. 3. W. 35. 22. 
N. sTRiGILATA. Oblong-ventricose, smooth, 
shining, with alternate yellow and black longi- 
tudinal streaks; spire exserted, acute; aperture 
white; lip denticulated; whorls three, without 
the point; diam. #7. W. 36. 38. 
N.vVIRGINEA. Ovate-globose, smooth, shining, 
spotted, and frequently banded; colours various ; 
spire shortish; lip denticulated; the general shape 
approximates somewhat to N. strigilata; diam. 3. 
W. 36. 37. 
N. FLUVIATILIS. Small, oval, back convex, 
glabrous, tessellated with various-coloured spots; 
whorls three; spire inclined lateral; lip entire; 
diam. 4. B. T. 124. 
N. viripis. 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. 3. W. 36. 33. 
NERITA. 
Solid, semi-globose, flattened below, without an um- 
bilicus; aperture semi-circular and entire ; inner 
