PROFESSOR OWEN ON INDIAN CETACEA. 31 
The resemblance to the Porpoise was suggested by the shortness of the snout; but 
this is more obtuse, and is not marked off from the rest of the head by any sudden 
narrowing. More important differential characters suggest the affinity of the “ Wonga” 
to a family of toothed Whales, distinct from the Delphinide. 
The first and most important of these is the inferior position of the mouth, beyond 
the small opening of which the blunt rostrum extends forward from 4 to 6 inches. 
The blow-hole (Pl. X. fig. 2) is single, but is not medial in position or symmetrical in 
shape; it is in advance of the eye, opens to the left of the mesial plane, is propor- 
tionally larger than in the Porpoise, and is crescentic, but curves obliquely from the 
mid line outward and backward, with the convexity turned forward and to the left, and 
the angles or “cresses” directed backward and to the right. The anterior angle is 
5 inches from the end of the snout. The eye is small; the palpebral orifice is be- 
tween 7 and 8 inches from the end of the snout, and opens in the upper half of the 
head, seen in profile, near the boundary dividing it from the lower half. From the 
yertical line bisecting the eye to the end of the muzzle the head forms a cone with 
a blunt apex, less obtuse when viewed from above (fig. 1) than from the side (fig. 2), 
this is formed by a 
” 
where the lower slope is interrupted by the small “rictus oris: 
kind of semicircular excavation of the under part of the snout, into which the short 
dentigerous part of the lower jaw fits, like a box in its lid. The length of the “ rictus” 
in a side view, straight line, is 24 inches in the male, 2 inches in the female. From the 
the parallel of the eye, the head, as it recedes, enlarges less rapidly; and the trunk 
continues gradually to expand to about midway between the end of the snout and the 
base of the tail. The widest part of the trunk is a little more forward in the male than 
in the female. 
According to the figures, the pectoral fin becomes free 1 foot 1 inch behind the 
snout in the male, and 1 foot 4 inches in the female; but there may be some inaccuracy 
here. The length of the fin in both is 1 foot; its extreme breadth is 4} inches in the 
male, 4 inches in the female: its line of attachment is in the lower third of the trunk, 
as seen in profile. The dorsal fin is well developed, subfalcate in shape; its anterior 
border is halfway between the snout and the base of the tail. The length of the base 
of the fin is 10 inches in the male, 9 inches in the female: the height of the fin, 
vertically at its back part, where the apex curves back a little beyond the basal attach- 
ment, is 7 inches in both. The anterior border of the fin is slightly convex ; its length, 
in a straight line, is 1 foot. 
The body, as has been said, gradually expands to near the origin of the dorsal fin, 
and thence contracts to the setting-on of the caudal fin: here the tail, or tail-end of the 
trunk, measures 34 to 4 inches in vertical and nearly 2 inches in transverse diameter. 
The expansion of the trunk is pretty equal in every direction towards the dorsal fin, and 
the upper surface gives the appearance of the fore part being subdepressed: the duninu- 
tion beyond the dorsal is more rapid from side to side than from above downward. 
The greatest vertical diameter of the trunk is, in the male, 1 foot 63 inches, in the 
