700 CLASS XVII. 



simple root, distinct, small, conic or compressed at the apex, rugose 

 or striate. Nose of males furnished with expansile appendage. 



9 9 -j -i o o 9 9 



(Dent. form. OWEN, i. ^ -j , c. j j , p. '^ ^ , m. ^ ^ = 30.) 



Sp. Cystophora proboscidea NILSS., Phoca leonina L. (not 0. FABR.), Phoca 

 proboscidea PRON, SCHREB. Sdugth. Tab. 83, (fig. from ANSON'S Voyage), 

 PERON Voyage, Ail. PL 32 ; F. Cov. Mem. du Mm. xi. PL 14, (figures 

 of cranium 1 ), Des Dents des Mammif. pp. 123, 124, PL 39 A, OWEN Odont. 

 p. 510, PL 132, 137 ; the largest species, it attains a length of 20 to 25 

 feet ; it lives in the southern hemisphere, is much hunted for the oil, and 

 great numbers are killed annually. Cystophora borealis NILSSON, Phoca 

 cristata ERXL., FABR., Phoca leonina 0. FABB. previously, H. EGEDE 

 Gronlands nye Perlustraiion, Kjobenhavn, 1741, Tab. at p. 46, Klapmuts 

 (Dutch Trans., Delft, 1746, p. 69), FABR. Skr. of not. SehTcab. i. 2, 

 pp. 120 139, Tab. 12, fig. 2 (cranium), F. Cuv. Mem. du Mus. \. L PL 13, 

 figs, g, h, i, Dents des Mammif. PL 388; (the two lower canines have 

 fallen out in some skulls). This species occurs chiefly in Greenland, and 

 becomes 7 or 8 feet long. The space between the external nostrils and the 

 apertures in the bony head is occupied in adult males by a membranous 

 and muscular sac divided into two lateral chambers by a prolongation 

 of the septum of the nose ; when the nostrils are closed the seal can 

 inflate these spaces in a remarkable manner : see W. RAPP in MECKEL'S 

 Archivf. Anat. u. Physiol. 1829, s. 236 241, Tab. 7. 



4 



Leptonyx GRAY, WAGN. Incisor teeth ^ , cuspidate, the lower 



5 5 



small, molars = =-, the hinder furnished with a double root, 

 o o 



Claws, especially of hind feet, small. 



Stenorhynchus F. Cuv. Molars compressed, with the edge of 

 crown divided by three or four lobes. Cranium narrow, elongate. 



Sp. Leptonyx leopardinus WAGN., Phoca leptonyx BLAINV., Stenorhynchus 

 leptonyx F. Cuv. Diet, des Sc. nat., Mammif. PL 47, fig. i, Mem. du Mus. 

 L L PL 13, figs, a, b, c, des Dents des Mammif. PL 38 A ; Stenorh. serridens 

 OWEN, Ann. and Mag. of nat. Hist. xn. 1843, P- 33 2 > Phoca carcinophaga, 

 D'URVILLE Voy. au pdle sud, &c. The known species of this division are 

 all from the southern hemisphere. Comp. GRAY Voy. of the Erebus. 



Pelagius F. Cuv. Molars with base oblique, somewhat broad, 

 oblong, compressed towards the crown, with middle cusp conical. 



Sp. Leptonyx monachus WAGN., Phoca monachus (HERMANN Beschdftigungen 

 der Berliner Gesellschaft naturf. Freunde, iv. s. 456, Tab. 12, 13), Phoca 



1 Fig. 2 (d, e, /), there named Phoque des Patagons, belongs to a younger 

 individual of the same species. 



