228 MR. W. A. FORBES ON THE EXTERNAL CHARACTERS A^B 



them are numerous entirely pale-brown ones ; so that in these regions the general colour 

 of the coat becomes much lighter, inclining to a mottled yellowish-brown tint. 



The sides of the neck are darker in colour than any other part of the body, the hairs 

 here being very deep black-brown, with very few pale ones intermixed. These latter 

 hairs increase in number towards the head, whilst posteriorly the hairs get shorter, 

 paler, and more tipped with yellow, so that the dark colour of the neck passes gradually 

 into the greyer tint of the head and the browner hue of the back. 



On the flanks, belly, and lips the yellowish-brown hairs and tips disappear, and the 

 general colour in consequence becomes a dark rich brown, with a vinous tinge in some 

 lights, particularly observable on the anterior parts of the pectoral limbs. The tail is 

 rich brown in colour. On the chest and between the pectoral limbs the hairs become 

 much shorter and yellowish-grey in colour ; but both the shortness of the hair and the 

 colour are, I believe, accidental, caused by the wearing-away of the hairs here by the 

 animal's position when in repose. 



The pectoral fins (PI. L. fig. 1) are above covered with closely appressed, short hairs, 

 which are black for the greater part of their length. There are no light-tipped hairs 

 at all on the " fin " below the humerus. The thickened convex radial margin, from 

 halfway down the first metacarpal for a breadth of about an inch, as well as the ulnar 

 side from two inches above the last nail, are naked ; the line of hairs runs along some 

 little way proximad of the nails, leaving the rest of the " fin " naked. Below, the flippers 

 are quite naked from a transverse line extending across a little proximad of the carpal 

 joint ; the bare skin is marked by numerous, subparallel, wrinkle-like lines. 



On the hind limbs (PI. L. fig. 2) the hairs extend above along the ridges of bone nearly 

 to the nails ; the margins for some way, as well as the skin between and below the 

 nails, are naked. Beneath they are naked from nearly the base of the free part. 



The accompanying Plate (XLVIII.) represents to the right the male specimen from 

 the Southport Aquarium, from a drawing by Mr. Smit, taken from the animal when 

 thoroughly dried. The attitude and position, however, are from a sketch made by him 

 of the adult specimen of the same species at the Brighton Aquarium, taken a few 

 weeks before its death. The figure to the left represents the female specimen at 

 Brighton, and is also taken from life ; it represents the animal, however, when wet. 

 The smaller size and different coloration of this sex are well shown in it, as well as the 

 difference in the contour of its head, due to the non-development of the great sagittal 

 crest, which is such a conspicuous feature of the male. The small distant figure in 

 the same Plate represents the male animal with its coat wet. On the second Plate 

 (PI. XLIX.) the head of the male Southport specimen is represented of half the 

 natural size. 



As regards the visceral anatomy, it, as might have been expected, conforms closely to 

 that of Of aria jubata, with some few minor differences. I did not examine the brain, 

 which is now mounted in the College of Surgeons' Museum. 



