CONCLUSIONS. 555 
wered in the affirmative. Remarkable is also the black colour of 
the region of the mouth and round the eye in some individuals of 
sea-serpents. This singularity occurs also in some specimens of other 
Pinnipeds. Of Zumetopias Stelleri “the end of the nose.... 1s 
naked and.... dull blue black” (Auunn, Hist. N. Am. Pinn. 
p. 2384, 235); of Zalophus cahiformanus we read: “A third is.... 
blackish around the eyes and nostrils’ (AuLEN, Hist. N. Am. Pinn. 
p. 277). In a foetal specimen: “nose and face, to and around the 
eyes’ are “black” (Ibid., p. 278); and Nixsson’s black variety of 
the Ringed Seal (Phoca foetida Faxsr.) has “nose and eye-rings 
uniform black” (Ibid. p. 602). 
Sexual differences, Mane. — The males of some species of Pin- 
nipeds have a mane, i.e. the hairs of the neck are longer than 
on the rest of the body. Of Humetopias Stelleri “the hair is longest 
on the anterior upper portion of the body, where on the neck and 
shoulders it attains a length of 40 mm.; it decreases in length 
posteriorly, and toward the tail has a length of only 15 mm.” 
(ArtEeN, Hist. NV. Am. Pinn. p. 234). Of the hairs of Callorhinus 
ursinus we read: “It is longest on the top of the head, especially 
in the males, which have a well marked crest. The hair is much 
longer on the anterior half of the body than on the posterior half, 
it being longest on the hinder part of the neck, where in the 
males it is very coarse. On the crown the hair has a length of 
42 mm.; on the hinder part of the neck it reaches a length of 50 
to 60 mm. From this point posteriorly it gradually shortens, and 
near the tail has a length of only 20 mm. The males have much 
longer hair than the females, in which it is much longer than in 
Lumetopias Stelleri.” (Auten, Hist. NV. Am. Pinan. p. 315). 
The difference in size of males and females is also a peculiar 
character of some species of Pinnipeds, as may be seen from the 
following tables: 
VERY OLD VERY OLD RATIO. | 
MALE. FEMALE 
Zalophus californianus iets 
Evmetopias Stelleri dis > Ja 100 : 69 
Macrorhinus leoninus PoE oar’) diary >) 100 : 60 
Macrorhinus angustirostris Zany 113} 9) | 100. 59° | 
Callorhinus ursinus ality) 4» 100 : 50. 
