70 
A. PHOCINAE, 
at 
Phoca Linn., Gill=Callocephalus F. Cuv., Gray. 
Callocephalus Gray. Halicyon Gray. 
Pagomys Gray. 
Fagophilus Gray. 
Erignathas Gill=Phoca Gray, not Linn. 
LTalichoerus Nilss. 
2. 3. 
Monachus Flem.=Pelagios F. Cuv.=Heliophoca Gray. 
B. CYSTOPHORINAE, 
Cystophora Nilss.=Stemmatopus F. Cuv. 
Macrorhinus F. Cauv.=Mirounga Gray=Macrorhyna Gray=Morunga Gray. 
Cc. STENORHYNCHINAE. 
Lobodon Gray. 
Stenorhynchus F. Cuv. 
Leptonychotes=Leptonyx Gray, not Sw. 1821. 
Ommatophoca Gray. 
Extinct Phocidae? 
Pachyodon Meyer. 
Pristiphoca Gerv. 
SUPER-FAMILY ROSMAROIDEA. 
XXVII. ROSMARIDAE. 
Single genus. 
Rosmarus Scop.=Odobaenus (Briss.) Il. Trichechus auct. pl., not Linn. 
Extinct Rosmaridae. 
Trichechodon Lankester. 
UNGULATA, 
SUB-ORDERS. 
I. Digits paired, the third and fourth being subequally developed and ex- 
serted; (the fifth, generally, nearly corresponding in size and position to 
the second, and, generally, developed—or atrophied—in nearly equal 
degree ;) the articulating phalanges and proximal carpal and tarsal bones 
correspondingly modified. Astragalus with its anterior or inferior articular 
surface divided by a crest into two sub-equal facets. Femur without 
a third trochanter, and with its shaft generally perforated at the fore and 
