MAMMALIA. 
25 
Family — DELPHINIDiE. 
Delphinus FitzRoyi. 
Plate X. 
D. suprh niger; capitis corporisque lateribus, corporeque subtus niveis ; cauda, pedibus, 
labioque inferiore, nigris ; fasciis latis duabus per latus utrumque oblique excur- 
rentibus, nigrescenti-cinereis, hujusque colons fascia, utrinque ab angulo oris ad 
pedern tendente. 
Description. — Upper parts of the body black, under parts pure white, the two 
blended into each other by gray : extremity of snout, a ring round the eye, 
the edge of the under lip, and the tail fin, black ; dorsal and pectoral fins 
dark gray ; a broad gray mark extends from the angle of the mouth to 
the pectoral fin ; above which, the white runs through the eye and is 
blended into gray over the eye ; two broad deep-gray bands are extended in 
an oblique manner along each side of the body, running from the back 
downwards and backwards ; iris of eye dark brown. Body anteriorly some- 
what depressed, posteriorly compressed ; head conical, arched above ; the 
lower lip projecting beyond the upper ; eye placed above and behind, but 
near the angle of the mouth ; breathing vent situated in the same line as the 
eyes— supposing a circle to be taken round the head. Teeth slightly curved, 
and conical ; in the upper jaw twenty-eight in number on each side, and in 
the lower, twenty-seven. 
Ft. In. Lines. 
Total length (measuring along the curve of back) .... 
Length from tip of muzzle to vent ....... 
to dorsal fin ..... 
to pectoral ...... 
to eye 
to breathing aperture (following curve of head) 
to angle of mouth ..... 
of dorsal fin along the anterior margin ..... 
Height of do. .......... 
Length of pectoral, along anterior margin ...... 
Width of tail ........... 
Girth of body before dorsal fin . 
before pectoral fin ...... 
before tail fin .... 
of head over the eyes ......... 
Habitat, coast of Patagonia, Lat. 42° 30', {April.) 
E 
3 10 9 
2 6 5 
14 5 
0 9 9 
0 10 7 
0 7 9 
1 0 5 
0 6 4 
12 8 
1 4 5 
3 0 6 
2 8 2 
0 7 8 
2 0 0 
