SCHULTE, SEI WHALK. :',!) 



and the hump of most rostral position, being distinctly in front of the anus. It has also the 

 widest flukes. B. physalus has the hump farthest caudad and of greatest height in the series, 

 and has also the narrowest flukes. In B. vellifera the flipper is broadest, the rostrum longest. 



EXTERNAL ANATOMY. 



Coloration. To some extent the epidermis has desquamated though the precise limits 

 cannot now be determined accurately. As the pigment is epidermal this desquamation has 

 reduced the colored area of the foetus, and the following description therefore understates the 

 pigmentation, which presumably was present over the greater part of the back. This, in the 

 foetus when received, together with the venter was a uniform light buff, except for the lips of 

 the blow holes and the ridges lateral to them. A narrow dark streak is present upon the lips. 

 On the upper lip it is sharply limited orally by the superior labial sulcus. It extends forward 

 within a centimeter of the tip of the snout; at the angle of the mouth it turns inward beside 

 the ridge formed by the temporal muscle, and broadening and becoming paler upon the palate 

 can be followed to the orifice of the pharynx. A small extension on each side is directed rostrad 

 beside the median ridge of the palate. In the lower lip the pigmentation also stops abruptly 

 at the very minute inferior labial sulcus. The streak becomes paler and broader towards the 

 angulus oris and fades out before reaching it. Rostrad it is prolonged upon the pointed extrem- 

 ity of the lips and passes over their margin to a slight degree upon their aboral surface. This 

 pigmented area at the symphysis is divided by two pale lines continuing the direction of the 

 inferior labial sulci into a median triangle on the oral aspect of the symphysis, and an outer 

 V-shaped area formed by the union of the labial streaks. The dorsum of the flukes is pig- 

 mented. They are darkest near their caudal margin and become paler towards the median 

 line and towards the rostral border, which itself is unpigmented as is also the ridge of the peduncle 

 between the flukes. The posterior margin of the flipper and a narrow border zone of its inner 

 surface are dark slate colored; the outer surface is more extensively colored along the posterior 

 margin in the middle third of its length, and there is in addition a narrow axial streak extending 

 nearly to the tip. In later foetal stages this type of pigmentation evidently disappears, for 

 Collett describes the coloration of his specimens, from five to nine feet in length, as being "homo- 

 geneous, a reddish-brown on the upper and under sides, without any appearance of white on 

 the belly." 



Hairs. Eight very small papillae were present, four on each side, in a row along the inferior 

 margin of the lower jaw. The most posterior is placed vertically below the eye, the most ante- 

 rior 14 mm. farther forward. The intervals between the papilla? increase in length from behind 

 forward (3, 4 and 6 mm.). Collett found the hairs 'visible but quite short" in his youngest 

 foetus (155 cm.). He does not give their number or arrangement. In a foetus of 241 cm. 

 there were seventeen hairs on each side in the mandibular region arranged in three rows, three 

 each in the upper and lower and eleven in the middle row. On the upper jaw there were 

 seven hairs on each side in a single row, thus making a total of thirty-four hairs in this foetus. 



Outline of body. The rostrum is moderately arched, pronouncedly decurvate at the tip. 

 It is separated from the strongly projecting brain case by a shallow concavity in which are sit- 

 uated the blow holes. From the prominence of the cranium the dorsal contour is evenly and 

 gently convex as far as the hump, beyond which it declines in a straight slope to the beginning 



