PROFESSOR OWEN ON INDIAN CETACEA. 21 
in D. 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 D. gadamu, 
From the hind border of the caudal fin to the vent is 2 feet 5 inches: the vulva is 
21 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 D. lentiginosus, taken also at 
Waltair, which was of a rather darker bluish slate-colour 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 ot 
2—32 
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 Delphinus (Steno) lentiginosus is rather narrower in proportion to its 
length than in D. gadamu; the occipital condyles are larger, the superoccipital surface 
is narrower, the temporal fosse more squared above; the premaxillaries do not rise to 
form a distinct convexity at the upper part of the rostrum, as in D. 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 103 inches in D. gadamw, 11 inches in D. lentigi- 
nosus. But the chief distinction is in the number of the teeth: in the skull here 
noticed and figured there are, in the upper jaw, 33—33, in the lower jaw, 32—32 
—130, and the tecth are smaller. The extent of the dental series of the upper jaw in 
D. lentiginosus is 9 inches 9 lines, but is not more than 8 inches 6 lines in D. gadamu. 
The D. 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 D. 
Susiformis (Pl. V. fig. 1); but the head is relatively larger, and the body is deeper in ~ 
proportion to its length, than in either D. Susiformis or D. gadamu. 
