PEOFESSOR OWEN ON INDIAN CBTACEA. 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 11 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 diff'erence from any of the three preceding species is still more marked in the skull 

 (PL VII.), which presents the general characters of that section of I)el]}hinidm 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 {k) ; but the breadth 

 there is 5^ inches in Lagenorhynchus electra and 5 inches in Lagenorhynchus fusiformis. 

 In this species a narrow slip of the vomer (fig. 4, is), about an inch in length, appears 

 on the bony palate, 3 inches from the anterior end. 



In Lagenorhynchus (PI. VII.) the skull is broader in proportion to its length, and the 

 mandibular symphysis shorter, than m Steno (PI. IV.) ; the transverse undulation of the 

 hind part of the palate is less marked, the middle convex tract being broader and lower, 

 and the lateral channels wider and shallower. 



Delphinus pomeegba, 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. Gray') and the Delphinus forsteri" of the Pacific. 



' Schlegel. Mr. BIyth has inserted a note on this species in the ' .rournal of the Asiatic Society of Bengal,' 

 1848, pp. 249, 250. 



' Forster, " Descriptio Animaliumj" drawing no. 24 (copied by Dr. Gray, in the ' Zoology of the Erebus and 

 Terror,' " Cetacea," 4to. 1845, plate 24). 



