CETACEA. 75 
Cervical vertebre : first free, second and third united by spi- 
‘nous process, not by the body, thin; rest free, thin. 
~ Monodon, Artedi, Gen. 78; Synon. 108; Hill. Anim. 313.t. ; 
_ Linn. S. N. ed. 6,17; Schreb.; Gray, Zool. E. & T. 29, not 
Swainson. 
_ Narwal, Schonev. Ichth. 28. 
_ Narvalus, Lacep. Cet. 163; Dumeril.; Rafin. Anal. Nat. 61,1815. 
_Ceratodon, Brisson, R. A. i. 231, 1762; Illiger, Prod. 142, 1811; 
Wagler, N.S. Amph. 34, 1830. é 
- Diodon (or Diodonta), Storr. Prod. Mam. 42, 1780. 
_ Monoceros, Charlet. Exerc. Pisce. 47. 
_ Monoceros piscis, Willoughb. Pisc. 42. t. A. f. 2, App. p. 12. 
_ Oryx, Oken, Lehrb. Naturg. 672, 1815. 
_ Right tusk generally not developed. Female generally with- 
_ out tusk, but sometimes has one: see Linn. Trans. xiii. 620. 
Inthe Museum of the College of Surgeons there are several 
_Hunterian preparations of the skull of this animal, Nos. 1147, 
- :1148, 1149, 1150, 1151, showimg the two rudimentary teeth in- 
_ closed in the cavity, in the female, and the single exserted one in 
_ the male skulls. 
_ Mtr. Knox observes, the female Narwal skulls have two rudi- 
mentary teeth in the upper jaw, which are rarely protruded. In 
_ the foetus, on each side the upper jaw, in the usual place, are 
_ two hollow teeth, obviously the extremities of the spiral per- 
manent teeth of the male; they are completely imbedded in the ¢ 
jaw; and if the animal is a male the left tooth continues to grow, 
the right after a time fills up, its central cavity containing the 
_ pulp disappears, and after attaming a growth of five or six 
- inches, the jaw elongates to correspond with the growth of the 
animal and the other tooth, and the abortive tooth remains im- 
bedded in the jaw for life.—Trans. R. Soc. Edin. ii. 413. 
The Monodon spurius, O. Fab., the type of the genus Anar- 
nacus of Lacepéde (Cetac. 164), appears by later research to have 
een founded on an inaccurate description of an Hyperoodon, the 
lower jaw having been mistaken for the upper, and the converse. 
‘1. Monopon Monoceros. The NaRwHAL. 
Black ; when old, whitish-marbled. 
_ Monodon monoceros, Linn. Faun. Suec. 2.16; Syst. Nat.i. 105 ; 
_ Schreb. Saugth. t. 330; Desm. Mam. 523; Fischer, Syn. 516; 
R Scoresby, Arct. Reg. i. 486, i. t. 12. f.1,2; Fleming, Mem. 
_ Wern. Soc. i. 146, fig.; Gray, Zool. E. & T. 29; Sow. Brit. 
mee Misc.t. ~ 
_ Mz. unicornu, Linn. Mus. Adolph. i. 52. 
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