310 DELPHINIDiE. 



Beluga Kingii, Oray, List Mamm. S. M. 104 ; Zool. Erebus ^ Terror, 

 30. t. 7 (skull). 



Inhab. Coast of New Holland {Oapt. P. P. King). 



a. SkuU : length, entire, 13J, of beak 5| inches ; -width at notch, 4|, 

 at orbits 8 inches. New Holland. Presented by Capt. P. P. King, 

 R.N. Specimen described, Gray, Ann, Phil. 1827, and Zool. 

 Erebus and Terror, t. 7. 



This may be the Jacobite, or Tursio corpore argenteo extremitatibus 

 nigricantibus, Commerson, MS. ; Belphinus Oommersonii, Lacep. 317, 

 from Cape Horn, cited by Cuv. E. A. i. 291 and Oss. Foss. v. 289 ; 

 but the colour of the Australian Beluga has not been recorded. 



" A large White Porpoise visits Amoy and other southerly harbours 

 from the sea. I have in vain striven to procure specimens." — B,. 

 Swinhoe, Report Asiat. Soc. Bengal, 1863. 



13. MONODON. 



Head round, and convex in front. Dorsal fin none. Teeth early 

 deciduous. Lower jaw of adult not so wide as the upper, toothless. 

 Upper jaw in the male (and rarely in the female) with a produced 

 spiral tusk. 



Cervical vertebrae : first free ; second and third united by spinous 

 process, not by the body, thin ; rest free, thin. 



Monodon, Artedi, Oen. 78 ; Synon. 108 ; Sill, Anim. 313. t. ; Linn. 8. N. 



ed. 6. 17 ; Schreb. ; Gfrai/, Zool. E. 8;. T. 29 ; CcO,. Cetac. B. M. 75 ; 



Proc. Zool. Soc. 1864, 246 (not Swainson). 

 Tachynices, J. Brookes, Cat. Mvs. 40, 1828. 

 Narwal, Schonev. Ichth. 28. 



Narvalus, Luc^. Cet. 163 ; EumSril; Bqfm. Anal. Nat. 61, 1815. 

 -Ceratodon, Brisson, JR. A. i. 231, 1762; Illiger, Prod. 142, 1811; 



^a^/ej-, iV. ^. ^mM. 34, 1830. 

 ■Diodon (or Diodonta), Storr, Prod. Mamm. 42, 1780. 

 Monoceros, Charlet. JExerc. Pise. 47. 

 MonoCeros piscis, Wilhtghb. Pise. 42. t. A. f. 2, App. p. 12. 

 Oryx, Oken, Lehrb. Naturg. 672, 1815. 

 TachynicidsB, J. Brookes, Cat. Mus. 40, 1828. 



Eight tusk generally not developed. Female generally without 

 tusk, but sometimes has one. — See Linn. Trans, xiii. 620. 



In the Museum of the Eoyal College of Surgeons there are several 

 Hunterian preparations of the skull of this animal, nos. 1147, 1148, 

 1149, 1150, 1151, showing the two rudimentary teeth enclosed in the 

 cavity in the female, and the single exserted one in the male skulls. 



Mr. Knox observes, the female Narwal skulls have two rudimentary 

 teeth in the upper jaw, which are rwrely protruded. In the foetus, on 

 each side of the upper jaw, in the usual place, are two hollow teeth, 

 obvipusly the extremities of the spiral permanent 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 attaining 

 a growth of five or six inches, the jaw elongates to correspond with 



