PEOFESSOB OWEN ON INDIAN CETACEA. 21 



in I), gadamu ; the hind border slopes away gradually to an extensive base of attach- 

 ment, which is continued as a ridge halfway between the dorsal and caudal fins : the 

 length of the dorsal at its front margin is 1 foot 1 inch ; from the end of the snout to 

 the dorsal fin is 3 feet 4 inches ; from the front border of the fin's base to the mid fissure 

 of the tail-fin is 4 feet 2 inches ; the fin is rather more posterior in position than in 

 D. fusiformis, and is more obtusely terminated than in that species or in I), c/adatnu, 

 From the hind border of the caudal fin to the vent is 2 feet 5 inches : the vulva is 

 2\ inches in advance of the vent. The upper part of the pedicle of the caudal fin is 

 obtusely ridged ; the middle of the posterior margin of the fin is notched, as in the two 

 foregoing species ; the antero-posterior breadth of the fin, near the notch, is 7 inches 

 6 lines ; the transverse breadth of the entire fin is 1 foot 9 lines. 



A profile-view of the head and pectoral fin of a male B. lentiginosus, taken also at 

 Waltair, which was of a rather darker bluish slate-colou?- than the female, shows 

 the feeble indication of the fronto-rostral groove beyond the lateral indentations ; the 

 interruption of the convex curve of the forehead, before reaching the snout, is rather 

 more marked. The mouth is represented a little open, indicating the relative size of 

 the teeth so exposed; they were ||^=129. As in the female specimen, the pectoral 

 fin is not falciform, but has rather the shape of a scalene triangle, the two shorter sides 

 straight. 



The skull of Del^yhinus [Steno) lentiginosus is rather narrower in proportion to its 

 length than in B. gadamu ; the occipital condyles are larger, the superoccipital surface 

 is narrower, the temporal fossse more squared above ; the premaxillaries do not rise to 

 form a distinct convexity at the upper part of the rostrum, as in B. gadamu, but con- 

 tinue upwards the roof-like slope, begun by the maxillaries, which gives a triangular 

 transverse section to the middle and fore part of the rostrum. The breadth of the 

 rostrum at the antorbital notches is the same in both species, viz. 4 inches ; the length 

 of the rostrum, from the notches, is IQi inches in B. gadamu, 11 inches in B. lentigi- 

 nosus. But the chief distinction is in the number of the teeth : in the skuil here 

 noticed and figured there are, in the upper jaw, 33 — 33, in the lower jaw, 32 — 32 

 = 130, and the teeth are smaller. The extent of the dental series of the upper jaw in 

 B. lentiginosus is 9 inches 9 lines, but is not more than 8 inches 6 lines in B. gadamu. 



The B. lentiginosus is known to the Waltair and Vizagapatam fishermen by the 

 Telugu name of " Bolla Gadimi." 



Delphinus (Steno?) maculiventer. 

 Spot-bellied Dolphin. (PI. VI. figs. 1 & 2.) 



In the degree of convexity of the forehead the present species resembles the B. 

 fusiformis (PI. V. fig. 1); but the head is relatively larger, and the body is deeper in 

 proportion to its length, than in either B. fusiformis or B. gadamu. 



