PROFESSOR OWEN ON INDIAN CETACEA. 23 
with the eyes; crescentic, with the angles bent forward. The length of the snout is 
6 inches, of the “ rictus oris” 10 inches; from the end of the snout to the eye 1 foot; 
from the same to the setting-on of the pectoral fin 1 foot 7 inches; from the same to 
the setting-on of the dorsal fin 2 feet 7 inches; from the hind part of the base of the 
dorsal fin to the hind border of the caudal fin 2 feet 8 inches. The pectoral fin measures 
5 inches across the broadest part of its base, and is 1 foot in length, following the curve 
of the front border, which curve is much less than in the Gadamu. The dorsal fin is 
lower in proportion to the length of its base; its anterior border also shows a minor 
degree of convexity; the extent, following the curve, is 10 inches; the line of attach- 
ment measures 1] inches. The fore-and-aft extent of the mid part of the caudal fin is 
5 inches; the extreme breadth of the fin is 1 foot 4 inches. The vent is 1 foot 9 inches 
in advance of the mid notch of the caudal fin; the vulva is 5 inches in advance of the 
vent, the interspace being relatively greater than in the Gadamu. 
The colour of the “ Spindle-shaped Dolphin” is less darkly plumbeous than in the 
Gadamu, and becomes more gradually lighter towards the belly; the dorsal fin, the 
fore part of the pectoral and caudal fins, and the snout have the darkest pigment; the 
light ashy-grey belly shows no spots. 
The difference from any of the three preceding species is still more marked in the skull 
(Pl. VIL.), which presents the general characters of that section of De/phinide to which the 
term “Lagenorhynchus” has been attached. It resembles in size and general characters the 
skull of Lagenorhynchus electra, Gray ; but the occipital condyles are more approximate 
below the foramen magnum, the presphenoid is narrower, the longitudinal channel 
formed by it and the pterygoid is deeper and narrower: the rostrum is of equal length in 
the two species, viz. 9 inches 8 lines from the antorbital notches (4); but the breadth 
there is 54 inches in Lagenorhynchus electra and 5 inches in Lagenorhynchus fusiformis. 
In this species a narrow slip of the vomer (fig. 4, 13), about an inch in length, appears 
on the bony palate, 3 inches from the anterior end. 
In Lagenorhynchus (P1. VII.) the skull is broader in proportion to its length, and the 
mandibular symphysis shorter, than in Steno (Pl. IV.); the transverse undulation of the 
hind part of the palate is less marked, the middle conyex tract being broader and lower, 
and the lateral channels wider and shallower. 
DELPHINUS POMEEGRA, Owen. 
The Pomeegra Dolphin. (PI. VI. fig. 3.) 
This species belongs to the same section of Delphinus as the Black Dolphin of the Cape 
and Ceylon (Delphinus longirostris, Gray1) and the Delphinus forsteri of the Pacific. 
1 Schlegel. Mr. Blyth has inserted a note on this species in the ‘ Journal of the Asiatic Society of Bengal,’ 
1848, pp. 249, 250. 
2 Forster, “ Descriptio Animalium,” drawing no. 24 (copied by Dr. Gray, in the ‘ Zoology of the Erebus and 
Terror,’ “ Cetacea,” 4to. 1845, plate 24). 
