SPOTTED DOLPHIN. 319 



diverge abruptly to the line of the hinder edge of the pectorals, post erior 

 to which the spots of the sides again converge toward the median line. 

 On the sides there is a similar change of direction, wliich is especially 

 noticeable over the pectoral tin. It is to be remarked that there is a 

 Similar change in direction in the lines of light color on />. dvlplns and 

 other species. 



Measurements of the exterior of Proddphinus doris, No. 15030, $ . 



Centimeters. 



Total length 216.7 



Length of mouth 28.0 



Extremity of snout to eye 33.7 



Extremity of snout to blow-hole 34. 7 



Extremity of snout to anterior base of pectoral fin 50. 7 



Extremity of snout to anterior base of dorsal fin 104. 5 



Extremity of snout to anterior end of genital slit 134. 3 



Extremity of snout to anus 153. 5 



Length of pectoral fiu 30. 4 



Greatest breadth of pectoral fin 12. G 



Width of base of pectoral fin 11.9 



Distance between bases of pectoral fins on under side of body 21. 3 



Length of genital opening 13.9 



Length of anus 2. 



Breadth of flukes 52.7 



Depth of flukes 16.0 



Length of anterior margin of dorsal fin (following curve) 44. 3 



Vertical height of dorsal fin 24. 1 



Length of base of dorsal fin 36. 7 



Length of beak '. 12. 7 



Length of eye 2. 8 



Breadth of blow-hole 2.5 



OSTEOLOGY. 



The skull has the form of the type specimen of Prodelphinus doris, with 

 which the species is believed to be identical. The length of the beak is 

 a little less than three-fifths that of the skull ; its width at the middle is 

 one-eighth the total length. The intermaxillaries are high and rounded. 

 The palate is generally flat, but with a deep channel in the median line 

 anteriorly, iu which the vomer becomes visible. The pterygoids, which 

 meet in the median line, are very long, making the distance from their 

 extremity to the tip of the beak three-fourths the length of the skull. 

 They stand on a raised table 3.3 cm broad. The prenarial triangle is 

 short (about 7.6 cm ), depressed, and rugose in the anterior part. The 

 temporal fossa; are large and rounded. Teeth ?£g; the crown of the 

 largest tooth .8 (lu long, .5 cm in diameter at the base. They are slightly 

 worn at the tips. 



The vertebral formula is as follows : O. 7 ; D. 14, L. and Ca. 48 = 69. 

 The atlas and axis are united, but the remaining cervicals are free. 

 Except that the neural spine of the atlas is not bifurcated, the cervical 

 vertebrae present do salient characters by which they could be distin- 



