ii. 200
_Nathalis_, ii. 478
_Natica_, ii. 539
NATICIDÆ, ii. 508
_Nautilus_, ii. 539
NATRICINÆ, ii. 375
_Nattereria_, ii. 417
_Nauclerus_, ii. 349
_Naucrates_, ii. 429
_Naultinus_ ii. 400
NAUTILIDÆ, ii. 506
_Navicella_, ii. 510
Nearctic region, defined, i. 79 subdivisions of, i. 80 distinct from Palæarctic, i. 79