190 



pad, which, on being set free, returned to its place in the nares with 

 a very audible " thud." The nares, each 4 inches in their hori- 

 zontai diameter, were protected above and at the sides by cartila- 

 ginous arches, which extended nearly to the surface of the spiracles 

 posteriorly, and united at a point a little anterior to the section 

 shown in figs. 4 and 5, cut transversely to the spiracles ; fig. 4 re- 

 presenting the dilated, fig. 5 the closed access to the lungs. 



The whole lining of the spiracles, breathing canals, and bronchial 

 cavities, was of a deep black. 



The septum immediately between the'two nares was membranous, 

 attached to the line of union of the cartilaginous arches before men- 

 tioned. 



From the blowholes a ridge composed of a tendonous fatty sub- 

 stance extended, gradually disappearing ere it reached the snout. 



The eyes were situated on bony prominences, which projected 

 outvvards and downwards from the line of the head and npper jaw. 

 The external opening of the eye was about 4 inches. The ball 

 5 inches. The conjunctiva whitish, and the iris very dark brown. 

 The excised crystalline lens measured two-thirds of an inch in dia- 

 meter. 



The bones of the lower jaw were covered to nearly half of their ap- 

 parent depth by strong, firm lips, turned inwards superiorly. The 

 jaw at no point projected much over the folds on the throat, and be- 

 neath the eye passed away imperceptibly into the neighbouring sur- 

 face. The rounded npper surface of the lips fitted accurately, when 

 the mouth was closed, into corresponding retuse hollows in the upper 

 jaw, extending two-thirds of the distance from the eye to the snout. 



The baleen extended from within 4 inches from the snout to the 

 interior angles of the mouth. The platės were largest halfway be- 

 tween these points. Their exterior outline was considerably falcate, 

 causing the points of the platės to project, where longest, 6 inches 

 past the edge of the upper jaw. 



The back part of the mouth, in the neighbourhood of the throat, 

 was thinly covered with soft white hairs, inserted on the plaited and 

 wrinkled skin. 



Fig. 6 represeuts an ideal section through both jaws, partially 

 opened, showing the palatai ridge, the projecting baleen, and the 

 overlapping imder-lips. 



The tongue is represented lying in the distended pouch, and by 

 the red lines as seen in the šame pouch when drawn upwards to the 

 jaws. 



The baleen towards the snout gradually gavę place to narrower 

 platės, tbree or four occupying the place of one. This change of 

 form commenced at the inside. At the snout, the platės were still 

 more broken up, there assuming the appearance of small rods of 

 baleen, of the thickness of a crow-quill, slightly compressed, and 

 each tipped by a tuft of long white bristles. The baleen completed 

 the circuit of the snout, at a distance of 4 inches within the upper 

 lip. At the snout, the base of the baleen was 1 inch in width, gra- 

 dually increasing until, where the largest platės were inserted, it at- 



