MAMMALIA. 25 



Family— DELPHINIM1. 



Delphinus FitzRoyi. 



Plate X. 



D. supra niger; capitis corporisque lateribus, corporeque subtus niveis ; caudd, pedibus, 

 labioque inferiore, nigris ; fasciis latis duabus per latus utrumque oblique excur- 

 rentibus, nigriscenti-cinereis, hujusque coloris fascia utrinque ab angulo oris ad 

 pedem 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) . . . • • .540 



Length from tip of muzzle to vent . . . . . . • • .3109 



to dorsal fin . . . . . . . .265 



to pectoral . . . . . . . .14 5 



to eye 9 9 



to breathing aperture (following curve of head) . .0107 



to angle of mouth . . . . . . .079 



of dorsal fin along the anterior margin . . . . . . .10 5 



Height of do. 6 4 



Length of pectoral, along anterior margin . . . . . • . .12 8 



Width of tail 145 



Girth of body before dorsal fin . . . . . . . . . .306 



before pectoral fin . . . . . • . . .282 



before tail fin . . . . . . . . .078 



of head over the eyes .. . . . . .. . . .200 



Habitat, coast of Patagonia, Lat. 42° 30', {April.) 



E 



