PHOCID^E 605 



nails of both fore and hind feet very small and rudimentary. One 

 species, M. albiventer, the Monk -Seal of the Mediterranean and 

 adjacent parts of the Atlantic. 



The other genera x of this section have the same dental formula, 

 but are distinguished by the characters of the cheek-teeth and the 

 feet. They are all inhabitants of the shores of the southern 

 hemisphere. 



Ogmorhinus. 2 All the teeth of the cheek - series with three 

 distinct pointed cusps, deeply separated from each other ; of these 

 the middle or principal cusp is largest and slightly recurved ; the 

 other two (anterior and posterior) are nearly equal in size, and 

 have their apices directed towards the middle one. Skull much 

 elongated. One species, 0. leptonyx, the Sea-Leopard, widely distrib- 

 uted in the Antarctic and southern temperate seas. 



Lobodon? Cheek-teeth with much-compressed elongated crowns 

 and a principal recurved cusp, rounded and somewhat bulbous at 

 the apex, and one anterior, and one, two, or three posterior, very 

 distinct accessory cusps. One species, L. carcinophaga. 



PcecilopJwca.* Cheek-teeth small, with simple, subcompressed, 

 conical crowns, having a broad cingulum, but no distinct accessory 

 cusps. One species, P. weddelli. 



Ommafophoca. 5 All the teeth very small ; those of the cheek- 

 series with pointed recurved crowns, and small posterior and still 

 less developed anterior accessory cusps. Orbits very large. Nails 

 quite rudimentary on front, and absent on hind feet. The skull 

 bears a considerable resemblance to that of the members of the 

 next subfamily, towards which it may form a transition. There is 

 one species, 0. rossi, of which very little is known. 



Subfamily Cystophorinse. Incisors -f. Teeth of cheek -series 

 generally one-rooted. Nose of males with an appendage capable of 

 being inflated. First and fifth toes of hind feet greatly exceeding 

 the others in length, with prolonged cutaneous lobes, and rudi- 

 mentary or no nails. 



Cystophora. 6 Dentition : i -f, c -J-, p , m J- ; total 30. The 

 last molar has generally two distinct roots. Beneath the skin over 

 the face of the adult male, and connected with the nostrils, is a 

 sac which, when inflated, forms a kind of hood covering the 



1 For details of these and the other genera see Mivart, Proc. Zool. Soc. 1885, 

 p. 486, et seq. 



2 Peters, Monatsb. K. P. Akad. Wissenseh. zu Berlin, p. 393 (1875), substituted 

 for Stenorhynchus, F. Cuvier ; preoccupied for a genus of Crustacea. 



3 Gray, Zoology of Erebus and Terror, vol. i. p. 5 (1844). 



4 New name, Syn. Leptonyx, Gray, Charlesworth's May. Nat. Hist. vol. i. p. 

 582 (1837) ; preoccupied by Swainson, 1821. 



5 Gray, Zoology of Erebus and Terror, vol. i. p. 7 (1844). 



6 Nilsson, Faun. Scandinav. vol. i. p. 382 (1820). 



