6^8 MR. J. \V. CLARK ON DELPI1INUS ALBIROSTRIS. [June 20, 



four minute black bristles on eitber side, set in a line parallel to tbe 

 lower edge of the lip, and a quarter of an inch apart. The longest 

 of tbese measured one sixteenth of an inch. 



The crescentic aperture of the blow-hole, 1§ inch in width, was 

 placed directly over the eyes. 



The general form of the animal will be best understood from the 

 figure (Plate LXVI. fig. 2), taken partly from a photograph and 

 partly from notes and measurements made by myself. The colora- 

 tion was singularly beautiful, and I fear that no drawing can give any 

 adequate idea of it. 



The upper part of the body generally was a glossy black, and the 

 under a creamy white. The upper lip (before described) was white, 

 with a black spot at the tip, and a few irregular pale grey cloudings 

 on its surface. The convex forehead was at first white for half an 

 inch on the right side, and a quarter of an inch on the left ; this 

 white space was bounded by a wavy line of black spots of difFerent 

 dimensions, including a subtriangular space of a brownish colour, 

 2 inches broad, dotted with darker spots. 



Immediately behind the blow-hole was an ogee of black, lg inch 

 deep, succeeded by a space of light brown colour 8| inches wide by 

 9 inches deep. Beyond this the whole upper surface of the body 

 was black till about 18 inches from the tail, when it became grey. 

 At a point 10 inches from the centre of the tail this grey ceased, and 

 the tail became black above and below. The underside of the 

 caudal fin was irregularly streaked with grey ; and there was a white 

 spot on the raphe. 



Behind the eye and just above the pectoral fin was an irregular 

 patch of light yellowish-brown flecked with numberless spots and 

 dashes of brown of more than one shade, with an occasional black 

 mark. There was a long narrow band above this and between it and 

 the dorsal fin, sparingly spotted ; and a second space, marked like 

 the first, commenced at about the middle of the band and extended 

 backwards to a point halfway between that and the tail. The markings 

 upon both of these cannot be better described than by comparing them 

 with those upon a sheet of blotting-paper that has been much used. 

 They were thickest at the sides of the space, of which a small portion, 

 just in the centre, was free from markings altogether. Between these 

 spaces the black was less intense ; a band of it, however, extended 

 between the second space and the white of the belly. 



The pectoralswere black aboveand below; and a few grey markings, 

 which maintained a uniform width of about G inches, extended beneath 

 them over the white undersurface of the body, till at the anus the dark 

 grey colour of the sides curved downwards and narrowed the white to 

 less than half its width. Behind the anus there was a patch of light 

 brown about G inches long, succeeded b) T black as described above. 



Skeleton. — The condition of the bones when macerated showed at 

 once that the animal was a very young one. All the epiphyses were 

 distinct ; the transverse processes of the ribs and the terminal carti- 

 lages of the scapulae were unossified ; and the bones themselves were 

 quite soft and spongy. 



The total number of vertebra? is 90 or 91, which may be divided 



