68 
XXIII. ARCTOCYONIDAE. 
Extinct. 
Arctocyon Blainv.+Palaeocyon Blainy. (not Lund). 
, 
XXIV. HYAENODONTIDAE. 
Extinct. 
Hyaenodon de Laiz & de Par.=? Hyaenodon4- Taxotherium+ Pterodon Blainy. 
Fissipedium Genera incertae sedis. 
Acanthodon Meyer. 
Harpagodon Meyer. 
Patriofelis Leidy. 
Sinopa Leidy. 
(Hyaenidae?) 
Lycyaena Hensel. 
Hyaenictis Gaudry. 
( Viverridae?) 
Ictitherium Gaudry. 
PINNIPEDIA. 
FAMILIES. 
I. Molar teeth 2 or $; canines of both jaws moderately developed, those of 
upper jaw being scarcely larger than those of lower; incisors persistent. 
( Phocoidea.) 
A. Form comparatively archetypical, with the hinder legs flexible for- 
wards. Small ear conchs developed. Skull with the mastoid processes 
strong and salient, standing aloof from the auditory bullae; with well- 
developed post-orbital processes, and alisphenoid canals. Incisors (§) 
of upper jaw notched. Anterior limbs about as large as the posterior ; 
their feet with digits decreasing in a curved line and without claws: 
posterior feet with all their digits nearly co-terminal and furnished with 
long linguiform flaps extending beyond their tips; the three middle toes 
alone clawed. 
OTARIIDAE. 
B. Form attypically phociform, with the hinder legs projected back- 
wards aud not flexible forwards, Ear conchs obsolete. Skull with the 
mastoid processes swollen, and seeming to form part of the auditory 
bullae; the post-orbital processes null or obsolete; no alisphenoid 
canals. Incisors (variable in number—® or 4, or $—) of upper jaw not 
notched. Anterior limbs smaller than the posterior; the feet with the 
digits successively abbreviated and armed with claws; the posterior 
flippers emarginated (the third and fourth digits being shortest), and 
provided with claws (rarely suppressed). 
PHOCIDAE. 
(KXXV.) 
(XXVI.) 
‘ 
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4 
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~~ £27 ee 
