56 BOOK OF SPECIES. 



obtusely angular above; spire short; umbilicus 

 pervious and naked; diam. 1. W. 35. 10. 



N. MACULOSA. Sub-globose, glabrous^whitishj, 

 covered with innumerable reddish-violet spots ; 

 whorls obsoletely angulated above ; spire slightly 

 prominent, and rather acute; umbilicus partly 

 closed; diam. |. 



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-globosc, dccussatcd, 

 marked by impressed spots, white spotted with 

 orange ; spire short, oblique ; umbilicus broad, 

 gibbous, and bifid; diam. |. W. 35. 3, 4. 



N. MACULATA. Globosc, 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. 



