1G6 BULLETIN 36, UNITED STATE8 NATIONAL MUSEUM. 



PKODELPHINUS FRCENATUS (F. Caviei). 

 (Plato 19, figs. 1 and 2; plate 20, fig. 1.) 



Smaller tban P. plagiodon, which it resembles iu coloration. 



Color of the back and fins dark, sides lighter, belly white ; sides marked 

 with dark spots, the smaller of which are stellate. Dorsal and pectoral 

 fins with small spots (Liitken). 



1. ? Variety. Back dark greenish-gray, sharply separated from the 

 white of the belly. A dark line from the snout to the pectoral fin, 

 below which there are dark streaks and spots on the ground-color 

 (Liitken). 



2. ? Variety. — General form like that of P. lAagiodon. " Dorsal fin 

 high, rather acute at the tip. Black, sides with minute white specks; 

 the sides of the body above the base of the pectoral to the base of the 

 tail blackish gray, which color is obliquely extended as a lunate baud 

 from behind the vent to the back near the base of the tail." (Gray, 

 D. 2)nnctafa, Catalogue, p. 399.) 



3. '? Young. — Form stout; dorsal fin triangular, in the middle of the 

 back; pectoral fins long and narrow ; flukes very broad. 



Back black, which color becomes paler on the sides. Belly white as 

 far as the middle of the tail. Head black above, ashy on the sides; 

 a band of deeper tint extends from the corner of the mouth to be3^ond 

 the eyes. (F. Cuv., I), frcenatm, Hist. nat. des Cetaces, p. 155.) 



Teeth, l^. Vertebra^,:' C. 7; D. 14; L. IG-IS; Ca. 31-33 = 70. Skull 

 like that of P. plagiodon, but smaller. 



Measurements of the exterior (Liitken), S . — Total length, 73.7 inches 

 (187.2""); extremity of snout to dorsal fin, 33.8 inches (85.8'"'); extrem- 

 ity of snout to pectoral fin, 15.4 inches (39'''"). 



(7). punctafus, Gray, Catalogue, p. 299.) 2 . End of snout to tip of 

 tail, 72 inches (182.9''") ; to blowhole, 12^ inches (32.7"") ; to eye, 12J 

 inches (32.7<^'") ; to dorsal fin, 32^ inches (81.9'''"). 



{D. frocnatus, F. Cuv., Hist. nat. des Cetaces, p. 15G.) Total length, 

 57 inches (14G.2'™). 



Afeasurements of the skull. — (No, «3033, Paris Museum. P. frocnatus^ 

 Type.) Total length, 37.G"" ; length of rostrum, 21.8''"; breadth of 

 rostrum at its base, 8.9'^^'" ; at its middle, 5.2"" ; breadth between orbits, 

 1G.4'''"; length of temporal fossa, 7.1'". 



Habitat. — Atlantic Ocean ; Indian Ocean; Cape Verde; St. Helena; 

 Fernando Po [Flower) ; Madagascar. 



PRODELPIIINUS LONGIROSTRIS (Cxiay). 

 (Plato 20, fig. 2.) 



Back and fins dark gray, with very small, irregular blotches of lighter 

 gray. Belly white, with irregular, more or less stellate, spots of dark 

 gray. (U. S. Nat. Mus.) 



