4. TTjRsio. 2G3 



" The smaller of the two skulls represents another Porpoise of the 

 same species, harpooned oft' Cape Flattery, on the north-east coast of 

 Australia, Oct. 9, 1860. It was considerably smaller than the first 

 one, being only 6| feet in length. It was a, female. The colour was 

 exactly lead-colour, fading into whitish on the lower parts between 

 the anus and the snout. The sides were marked with small oblong 

 spots of the same colour as the back. Measurements when recent : — 



" Total length, snout to centre of tail, 6 feet 9 inches. 



" Snout to base of dorsal, 3 feet ; length of anterior border of dorsal 

 13 inches ; height of dorsal 8 inches ; width of dorsal 12 inches ; 

 from posterior border of dorsal to tip of tail, 2 feet 8 inches. 



" Swimming-paws (midway between snout and dorsal) 13 inches 

 long, and 5^ inches broad ; from their base to end of snout 13 inches. 



" Tail 22 inches across from tip to tip. 



" Anus 2 feet 2 inches in front of tail (centre of tip). 



" Eye |ths of an inch in diameter, situated 1| inch behind angle 

 of mouth, and 12 inches from tip of upper jaw. 



*' Lower jaw projecting 1 inch beyond the upper. 



" This porpoise was occasionally seen, in small droves of from 

 three to six, along the north-east coast of Australia, within the 

 reefs. Two other species also were seen, but we could not fasten." 



The two skulls slightly differ in shape and size. 



No. 1 is 17 inches long ; the beak to the notch is 10 inches, and 

 the upper teeth-bone 8| inches long ; the front lower teeth are worn 

 away and truncated, like the teeth of the common Delphinus Tursio, 

 which was described as D. irunadus by Montagu. There are twenty- 

 seven teeth on each side in the upper, and twenty-five teeth on each 

 side in the lower jaw. 



No. 2 is 17 inches long; the beak 9|, and the upper teeth-bone 

 8 inches long. The teeth, twenty-four above (perhaps one on each 

 side is deficient, as the end of the jaw is very tender), twenty-thi-ee 

 or twenty-four below. The front lower teeth are slightly truncated ; 

 but this skull chiefly diff'ers from No. 1 in being rather more convex 

 and rather narrower, especially in the hinder part, from the middle 

 of its length. 



The skull is smaller in size, and has a much smaller brain-cavity 

 than D. Cymodoce (Gray, Zool. Erebus & Terror, t. 19) and D. Metis 

 (Gray, Zool. Erebus & Terror, t. 18) ; and the beak is not so tapering 

 as in these species, while the teeth are rather more numerous. 



It is equally distinct from Delphinus Eurynome (Gray, Zool. Erebus 

 & Terror, 1. 17), believed to be from the North Sea. 



III. Beak scarcely jyroduced. Nose of skull rather depressed, scarcely longer 

 than the brain-cavity. Teeth f ^ -^g. Cephalorhyuchus. 



Cephalorhyncluis, F. Cuvier, Cetac.; Gray, Cat. Cetac. B.M. 1850,106. 

 Grampus (pars), Gray, Spic. Zool. 2, 1828. 



11. Tursio Heavisidii. The Hastated Dolphin. 

 Black, with a white streak and two diverging lines beneath; 



