SCHULTE, SET WHALE. 401 



of the flukes, where the inclination increases somewhat. In the whole length of the upper ridge 

 of the peduncle are slight irregular undulations. The integuments of the intermandibular 

 region, throat, chest, and abdomen nearly to the umbilicus are redundant, baggy and very 

 freely movable on the deeper parts. There are no furrows. Just behind the umbilicus the 

 convexity of the belly ends and the ventral contour takes a rectilinear course to the flukes. The 

 vulva and anus occasion only a very slight protrusion. 



Head. - In the convex rostrum with its downcurved tip, the prominent eye, the great gape 

 of the mouth and its prolongation by a surface furrow below and beyond the eye, the head has 

 a remote and specious resemblance to that of the sauropside embryo. The rostrum is strongly 

 arched transversely and presents a slight protuberance on each side at the junction of its first 

 and middle thirds. This is prolonged backwards by a low ridge in the direction of the frontal 

 eminence before reaching which it merges in the general relief of the surface. Above and below 

 this ridge are concavities. The lower occupies the region between the eye and the protuber- 

 ance of the rostrum; the upper, smaller and narrow is limited by a median ridge which marks 

 the caudal half of the rostrum, bifurcating as it approaches the nares into two arms which skirt 

 the lateral margins of the blow-holes. Between the arms is a triangular slightly depressed area, 

 which is deepened to a sulcus between the blow-holes. These are slightly curved with mesal 

 concavity and approach one another anteriorly. Their length is 9 mm. The distance between 

 their anterior extremities is 2 mm.; between their posterior extremities 9 mm. They are thus 

 inclined to the median line at an angle of 68 degrees. About each blow-hole and in the median 

 sulcus there is some pigmentation of the epidermis. 



Eye. The eye forms a large prominence above the surface prolongation of the oral cavity, 

 which continues lateral to and beyond the temporal muscle. Into this caudal extension of 

 the vestibulum oris the eye projects by its ventral convexity. The globe is covered by the lids 

 which are fused together except for a small hiatus, 6 mm. in length and situated at the junction 

 of the third and fourth vertical quarters of the ocular protuberance, so that far the larger seg- 

 ment of the eye is covered by the upper lid. 



Ear. The external auditory meatus has a punctate orifice 24 mm. behind and 9 mm. 

 above the centre of the eye. 



Lips. The line of the mouth ascends with a moderate arch almost to the eye, where its 

 direction changes curving downwards below the eye and running out into a surface furrow which 

 terminates vertically beneath the ear. In its whole extent, save at the decurved tip of the 

 rostrum, the under lip overlaps the upper to a slight degree, a condition the reverse of that which 

 is usual in mammals. The tip of the lower lips beneath the rostrum, is everted and protrudes 

 in a rudimentary spout. From this point the margin of the lower lip, beginning as a faint ridge 

 rises into a high thin flange beveled at the expense of its oral surface, which upon reaching the 

 ocular region declines as rapidly. Here, below the eye, the margin of the lower lip is approached 

 by the ridge of the temporal muscle, directed from above and behind rostrad and slightly laterad ; 

 the oral surface of the lip becomes nearly horizontal, and there is formed between its margin 

 and the temporal ridge a concavity, apposed to the venter of the ocular protuberance and con- 

 tinued backward, lateral to the masseter muscle, into the surface furrow before mentioned. 

 It is this feature, dependent upon the small size of the masseter, the non-development of the 

 cheek, and the consequent rudimentary condition of the vestibulum oris, together with the 

 absence of a distinct mandibular ramus, which is largely responsible for the curiously sauropsid 

 expression of the cetacean foetus. 



