MACRORHINUS. 195 



2 2 

 orbital region much swollen. Dentition : in. , 



11 . 5 5 4 4 



c. J J, p.c. either ~ - or ^ j; canines large, with 



conical fluted crowns, fangs simple. Vertebral 

 formula C^D^^LjS^Cdjo = 40. Body bulky; males 15 

 to 20 feet long, much larger than females; males 

 with a tubular proboscis. 



(1) Macrorhinus leoninus. (Mac. l.) 



(Elephant Seal, Southern and Antarctic Oceans.) 

 (The only species.) 

 Phoca leonina, LinncBus, Syst. Nat., 1758. 

 Phoca elephantina, Molina, Saggio sul. Stor. Nat. del Chili, 

 1782. 



External Characters, Skeletons, and Skulls of the 

 Elephant Seal were described and figured by Turner 

 in his Challenger Report, Zoology, part Ixviii., 1887. 



1. Skull, male (/i). Length from end of premaxilla to occipital 



condyl 19^ inches, over vertex 25i inches ; breadth, 

 zygomatic 13f inches, of cranium at squamous sutures 

 8 J inches ; length of hard palate 9f inches ; greatest 

 width of anterior nares ^^^ inches, lateral boundaries 

 steep and almost in the plane of the front of the zygo- 

 matic arch. Mandible, length 13f inches ; subcondyloid 

 process not inverted and not continuous with the angle. 

 Basi-occipito-sphenoid joint not ossified, no foramen 

 in basi-occipital ; large occipital crest, sagittal crest 



5 5 



feeble and bifurcated. Dentition : p.c. ^ -= . 



Heard Island. Challenger Collection. 



2. Skeleton, well-grown male (e), from Betsy Cove, Kerguelen. 



Basi-cranial joint open, plates not fused with vertebral 

 bodies, nor epiphyses with long bones. Spine 8 feet 

 5 inches long, skull 15 inches, skeleton 10 feet long, 

 greatest width of atlas 7| inches. Vertebral formula 

 C-D^gLjSgCdjo = 40. Ribs, fifteen pairs, of which nine 

 articulated with sternum, which consisted of nine 

 segments. Scapula between angles llf inches, 

 glenoido-vertebral 8| inches, not strongly falciform, 

 prespinous somewhat larger than postspinous fossa. 

 Humerus 10^ inches long, no supracondyloid foramen, 

 radius 9| inches, ulna 11 inches long. Manus, radiale 



