174 SPECIMENS OF PINNIPEDIA. 



edge of zygoma. Hard palate narrowed behind, 

 hinder border concave ; mandible with inverted sub- 

 condyloid process. Length, old males 7 to 8 feet, 

 females about 4 feet. Manus long, narrow, naked : 

 nails rudimentary. Pes with toe-flaps very long; 

 nails rudimentary in outer toes, strong in middle toes. 



1. Skeleton of well-grown animal, not articulated, vertebral 

 plates not ossified to bodies; epiphyses of long bones not 

 fused with shafts. Vertebral formula, C^D^gLgSyCdg to ^^ 

 = 38 to 40. Ribs, fifteen pairs. Sternum, nine seg- 

 ments, 23 inches long ; upper segment 3,^ inches ; xiphi- 

 sternum with cartilaginous tip 5h inches; nine pairs 

 of costal cartilages articulated at junction of segments, 

 two pairs between 8th and 9th segments. Scapula 

 broad, prespinous much larger than postspinous fossa, 

 acromion rudimentary, coracoid a tubercle, lower 

 border falciform. Humerus without supracondyloid 

 foramen. Pelvic bones, iliac crest not inverted nor 

 everted ; ilium articulates with 1st and 2nd sacral 

 vertebras. Skull, length 9 inches, over vertex 12 

 inches ; zygomatic breadth 5h inches ; cranial breadth 

 3| inches ; pair of occipital crests. Hard palate 

 scooped out behind, from middle of posterior border 

 to hamular pterygoid If inch, from incisors to posterior 

 border 3| inches; surface shallow. Mandible 6^ inches 



long. Dentition: - ^ , c. - , p.c. - -; no diastema: 



* 2 2 11^ 5 5 



each post-canine tooth with large cusp, lower molars 

 also with small supplementary cusps. 

 St Paul's Island, Alaska. 



Donor— The Smithsonian Institute, Washington. 



(2) Arctocephalus australis. (Arc. au.) 



(South American Fur Seal.) 

 Phoca australis, Zimviermann, Geog. GeschicJite, iii., 1783. 



Facial part narrow, slender, elongated ; nasal bones 

 horizontal ; sagittal crest moderate ; post-canines 

 with large cusp, small anterior cusp and cingulum, 

 the last two with small posterior cusp ; mandible. 



1. Skeleton, imperfect, of a male A. australis, No. 3 in 

 Cliallenger Report, from Messier Channel Seven 

 cervical vertebrae, atlas greatest width 4i inches. 

 Ribs and sternum absent. Scapula, length between 



