22 BULLETIN 73, UNITED STATES NATIONAL MUSEUM. 



bounded by gradually converging lines extended 4^ inches back of the angle of the 



mouth. 



The inferior surface of the bony palate extended below the level of the lips, 

 and the sides of the former were visible upon looking into the mouth laterally. 



The blowhole was large and somewhat unsymmetrically placed, the right angle 

 being the more anterior. The concavity was forward. 



The eye was situated a little below the line of the mouth and 20^ inches from 

 the extremity of the snout. 



The external opening of the ear was 2| inches behind the posterior angle of 

 the eye, and a little below the line of the lower eyelid. 



The two throat-furrows were of unecpial length. The left furrow was 6| inches 

 long, and its anterior end was distant 8| inches from the extremity of the jaw. The 

 right furrow did not extend quite so far forward, and was 7f inches long. 



The furrows converged posteriorly; they were separated by an interval of 

 f inches anteriorly and 5 J inches posteriorly. Between the anterior ends of the 

 main furrows was a small one, about an inch long, but it is doubtful whether this 

 was a natural fissure. I did not observe it when the whale was in Atlantic City. 



The natural color of the specimen had largely disappeared before I examined 

 it, but Captain Gaskell and others who saw it while still fresh agreed that it was 

 very dark slate-gray on the back, lighter on the sides, and whitish on the belly. I 

 observed that a broad area between the pectoral fins was slate-gray, and contrasted 

 with the white of the throat and belly. The whitish color ended somewhat abruptly 

 and irregularly at the anus, and the flukes, as well as the pectoral and dorsal fins, 

 were probably very dark slate-gray, or blackish, when fresh. 



The epidermis was exceedingly smooth and glossy throughout. 



The tongue was purplish-white. The roof of the mouth was black, except at 

 the posterior end, where there was an irregular area of pinkish-white. 



The integument of the roof of the mouth was smooth and shining. Its surface 

 was convex at the extremity of the beak, but the central portion was concave, 

 while at the posterior end it was again raised into a rounded pad. In these respects 

 the shape of the integuments coincided with that of the underlying maxillae, upon 

 which they were closely fitted. The sides were rounded, and a shallow groove inter- 

 vened between them and the lips. This groove was continued around the roof of 

 the mouth behind, and formed a demarcation between this part and the oesophagus. 



The tip of the tongue was Ti inches from the extremity of the jaw. It was 

 oval in outline, the extremity is obtuse, and it was entirely bound down. The 

 margin was entire, and not crenulate, as in many dolphins. 



Dorsal and ventral views of the stomach are shown in PI. 40, figs. 1 and 2; 

 a dorsal view of the lungs in PI. 13, fig. 5; and of the perineum in PL 40, fig. 3. 

 A description of the gross anatomy is reserved for a subsequent paper. 



The external dimensions of the Atlantic City specimen of M. eurofmus are 

 given in the following table, together with those of nine European specimens of 

 M. hidens taken from various authors, and assembled here for purposes of com- 

 parison. The dimensions of the Annisquam specimen which, as already explained 

 (p. 9), represents a third species, are also added. 



