736 DR. J. E. GRAY ON NEW SPECIES OF DOLPHINS. [Dec. 12, 
Two of the skulls belong to the restricted genus Delphinus, which 
has D. delphis for its type. These have a very deep groove on each 
side of the palate. 
Both the figures of the animals belonging to these species have a 
narrow black streak from the base of the upper part of the beak to 
the eye; but the colours of the sides of the animals are differently 
distributed. There is also a very slight difference in the form of the 
bladebones (and this cannot be sexual, as they were both females), 
and in the form of the back part of the palate just in front of the 
hinder entrance to the nostrils. 
Considering that the colouring of the animals shows that they re- 
present two species, one is struck with the very small difference ex- 
hibited in the skull by species showing such marked external dif- 
ferences, and can only conclude by thinking how hasty we have been 
in referring skulls received from very distant parts of the world all 
to Delphinus delphis, and saying that that species has a very wide 
geographical distribution, more especially when we consider that 
these two species were obtained, the one in lat. 35° 38’ S., long. 
10° E., and the other in “lat. 34° S., long. 7° W.*—Grote.” 
birt. 
Delphinus moorii. 
1. DELPHINUS MOORII. 
Beak of skull elongate, depressed, once and three-quarters the 
length of the brain-cavity, and five times as long as the width at the 
notch at the base. The intermaxillary bones rather convex. Teeth 
small, slender, ‘> five in an inch length of margin; the front 
upper very small. The groove on the palate deep and wide, reaching 
nearly to the lip, and wider and very shallow in front. The hinder 
part of the palate in front of the inner nasal opening with a broad, 
triangular, longitudinal groove, having flat sides and convex outer 
sides. The bladebone rather produced behind the ridges and 
truncated at the lower part of the hinder edge. Coracoid process 
large, subtrigonal, the front edge being truncated, the lower one 
oblique. Length of skull 173 inches, of beak 11, of brain-case 63, of 
* The captain seems to have had a Swedish assistant; for the model of one of 
the dorsal fins is marked in Swedish, and the measurements are altered from 
Swedish to English feet and inches. 
