Mammalia. 237 



Dclfjhimis "DtJphis, Linnaeus. Head terminated in front by 

 a l()!ig flat snout ; the upper and under jaws of equal length, 

 CHcli with about forty-seven pointed teetli, and when the mouth 

 is closed those of the one jaw are included between those of 

 the other ; the opening of the spiracles situated nearly above 

 the eyes. The skin is very smooth and sliinins", the colour in 

 some individuals is a livid brown, in others it is black, on the 

 back, and pearly grey clouded with black on the sides and 

 belly or the belly is entirely wliite. Tail divided into two large • 

 lobes, slightly notched in the middle, and lis breadth from one 

 point to the other is generally equal to about two ninths of the 

 entire length of the animal, which averages between seven and 

 nine feet. Period of gestation ten months, and the female sel- 

 dom produces more than one at a birth. 



Inhabits most seas — and amongst others those on the West 

 Goast of Africa. 



Delphinus HeavisirUi. Gray. Head subconical, and termina- 

 ted in front by a short tapering, somewhat cj-lindrical, snout ; 

 body thick jn proportion to its IcTigth, black, variegated be- 

 neath with white; the marking of the latter colour consist of a 

 narrow transverse band in front of, and a somewhat triangular 

 spot behind, each of the pectoral fins, and of a longitudinal line 

 on the belly which divides beneath the dorsal fin into three 

 forks, the central one of which is continued in a direct line, 

 and the lateral ones extended obliquely up the sides. Dorsal 

 fin triangular, and about five inches in height ; tail semilunar 

 behind and notched in the middle. Length from nose to hinder 

 > edge of tail five feet ; length from point of snout to anterior 

 edge of dorsal fin two feet three inches ; breadth of dorsal fin 

 eight inches and a quarter ; length from hinder ed^e of dorsal 

 fin to tail fin one foot six inches ; width of hinder edge of 

 caudal fin fourteen inches. 



Inhabits the seas about the Cape of Good Hope, — gregarious. 



Delphinus tridens, Smith, MS. 



Dcfphinvs ohscvrus. Gray. Colour of back a clear shin- 

 ing black, sides of head and body clouded black and white ; 

 belly white ; on each side an indistinct dusky stripe, com- 

 mencing below the dorsal fin, descending obliquely and 

 ending- in the posterior and under part of the body ; ante- 

 rior portion of lower jaw and under surface in front of tail 

 dusky black, and a ssimilarly coloured ring surrounds each eye; 

 snout short, rounded, and not very distinct from the anterior 

 portion of the head ; teeth slightly curved, the convexities out- 

 wards, in the upper jaw about forty on each side, and in the 

 JOTvcr about thirty-six ; pectoral fins lonp, pointed, and falci- 



