~ 
56 BOOK OF SPECIES. 
obtusely angular above; spire short; umbilicus 
pervious and naked; diam. 1. W. 35. 10. 
N.macuLosa. Sub-globose, glabrous, whitish, 
covered with innumerable reddish-violet spots ; 
whorls obsoletely angulated above; spire slightly 
prominent, and rather acute; umbilicus partly 
closed; diam. 3. 
N. ARACHNOIDES. Roundish ventricose, gla- 
brous, zoned with white and yellow, with thin 
chestnut lines variously disposed; spire very short; 
umbilicus naked; diam. ?. W. 35. 15. 
N. CANCELLATA. Sub-globose, decussated, 
marked by impressed spots, white spotted with 
orange; spire short, oblique; umbilicus broad, 
gibbous, and bifid; diam. 7. W. 35. 3, 4. 
N. mMacutaTa. Globose, turgid, transversely 
striated obsoletely, whitish, spotted with blood- 
colour, with three bands of larger spots ; aperture 
semi-lunar, violet within; operculum calcareous, 
and furrowed all over; umbilicus large, contain- 
ing a straight semi-cylindrical reddish callus, 
nearer its lower than upper border; diam. 2. 
W. 35. 9. 
