* 
REVIEWS. 671 
Zalophus), raised to generic rank two additional groups named as sub- 
The extreme to which differentiation was carried may be judged from 
the fact that Mr. Allen has reduced two of his genera to one species, and 
was strongly inclined to reduce three others to a second species. Those 
sub-families in the main agreed with the genera defined in the ** Prodrome 
of the TTE but were rendered unnatural by the combination — in 
face of the characters used as diagnostic — of Arctophoca (a sub-division 
of sil cn with d and by the Marcum of Phocarctos 
(a form inseparable from Otaria) in the ** Arctocephalin As an example 
of the mode of differentiation, a follo wing diagnoses will suffice. 
** Nerphoca. sti large, thick, all equal, in a continuous uniform 
Series. Austra 
S will be eau E the same feature is indicated <a ae by a vot 
different phraseology, save as to the locality. But th 
character of locality is erroneous, for Zalophus has never yr Pap in 
South America, and its type is an inhabitant of the North Pacific only, 
i. e. California and Japan! 
The chief and most valuable information published after the “ Pro- 
drome," and up to the year 1870, was contributed by Dr. Wilhelm Peters, 
er al ch tas 
und to d impossible with the material possessed by the author of the 
> Prod: rom 
Much anc PUR had also accumulated as to the distribution, habits, 
‘Was with t 
investigation of the North Pacific species of s family, and incidentally 
f the classification of the entire group. He has, like his immediate pe 
decessors, admitted the validity of the family ee by him ** Otariade, 
and has admirably contrasted the characteristics of the pelvis and hind 
that **these appear to be natural groups, of true generic rank, and prop- 
erly restricted; and, after a careful examination of the subject,..... 
" nd appear to [him] to include all the natural genera of the family." * 
e genera are considered by Mr. Allen as separable among two 
se 
sub-families, the author remarking (p. es * that if the Otariade constitute 
à group entitled to family rank. — and the so-called sub-families of the 
neater 
* Allen, op. cit., p. 38. 
