REVIEWS. 679 
4. — á golf EIU te Maite 238 Peters. 
5. Callorhinus ursi T iibris dab iioad bacc da C o o Mr, 
6. Arc den vi lr is aas Pipes EE MINUS RAD 262 . Gray. 
7. Zalophus ee sl (aponica, UU MUR. 8 o, D a 
8. Callorhinus ursin $ o an a eae i ei 975 Allen. 
9. Zalophus Gimespiys e ode e oet RH Roane 0 OR eg 
10. "t st i ‘ . . ` 290 Allen 
1l. O HrOvL | ol E E AET T A EE S a 
12. Zalophus Gillespii (Japonica), . . +. «.« -. >œ 310 Peters, 
13. e « À : $ : : : i r . 830 Allen. 
M.íOtatii])ubiMa, (^ "Lose ead: Sa 835 Gray. 
15. Eumetopias "C ‘ ane Reine Vau s . A . 85 Gray 
16. ee al ea og lel 374 Allen. 
17. i ud - 889 Allen. 
As it may be objected that the skull of Otaria Ullow was of a female or 
young, we will at once dismiss that from consideration. But the forms 
still remaining, and concerning which no objection, it appears to us, can 
plies a greater relative total length for those animals than the head alone 
would verde and thus the inapplicability of the diagnosis is still fur- 
ther enhan 
As to us PE VER — from the comparative robustness or slen- 
derness, the following measurements by Mr. ^P M of the hair and fur 
seals of Alaska, show the usta proportion 
Ratio of skull to 
Unmounted. Mounted Skull. length of male skin. 
Callorhinus weinus (2, M 2,470 245 I-X. 20- 
2,311 2,390 275 I-VIII. 190-275 
Eumetopias — G mo, 2,750 2,790 874  L-VII. 300-374 
: 2,896 3,010 385 .— L-VII. 315-385 
When we thus become cognizant of the comparatively slight differences 
between the two members of the family observed, when too, we notice the 
range of variations in one of the species, and when we reflect that such 
difference may be created by the mode of preparation of skins, and that 
other forms appear to be intermediate, to say the least, the character be- 
ngible. 
The length of the ears is the next character noticed; ge following 
measurements will strate the relative lengths in millimetre 
Otaria ETE T Eumetopias, $ Allen. 
Zalo tiai BEI ters Arctocephalus è 30-40 Peters. 
E aw is cos E Pete Callorhinus, à . 85-50 Allen. 
These measurements, by Mr. apes are from the same individuals, before 
* No data are given concerning the pu E the girth to the length, and no very appreciable 
MM dn constant differences appear to exist, : hough Pee is said to be considerable diference 
