200 SPECIMENS OF PINNIPEDIA. 



1. Skull, with mandible, adult. Length in straight line 

 12 inches, over vertex 14^ inches. Breadth, zygo- 

 matic 6y\j inches, cranial 5^0 inches. Anterior nares, 

 greatest width If inch, sagittal diameter S\l inches. 

 Nasals fused mesially into a triangular plate with 

 base in front ; premaxillaj reach nasals. Hard palate 

 with markedly concave posterior border, mesial length 

 5-1 inches. Mandible 7| inches long, angle distinct, 

 symphysis 2| inches long. Teeth characteristically 

 cusped. 

 From the Scottish National Antarctic Expedition. 



Donor — Dr W. S. Bruce. 



II. LEPTONYCHOTES. (Lep.) 



Leptonychotes, Gill, Proc. Essex Inst., x., 1866. 



Premaxillse articulating with nasals ; cranial breadth 



more than interzygomatic ; anterior nares oblique ; 



inter-orbital part of frontal long, constricted behind, 



broader anteriorly ; superior maxilh© with moderate 



articulation with nasals. Hard palate scooped out at 



posterior border. No post-orbital process; hamular and 



pterygoid horizontal, everted; tympanic bulla swollen, 



not ridged, its anterior border truncated. Humerus 



without supracondyloid foramen. Dentition : in. 



2 2 11 5 5 



% ^, c. T y , pc. p y . Post-canines two-fanged 



excej)t the most anterior, crowns with one large cusp. 

 (1) Leptonychotes weddelli. (Lep. w.) 



(WeddeH's Seal, Southern Ocean.) 

 (The only species.) 



Otaria weddelli, Lesson, Ferussac, Bull. Sci. Nat., vii , 1826. 

 Leptonyx weddelli. Gray, Zool. Voy. Erebus and Tensor, 1844. 

 Leptonychotes weddelli, Gill, op. cit. 



The skull and other bones of the skeleton of Weddell's 

 Seal were described and figured by Turner in the 

 Challenger Report, Zoology, part Ixviii., 1887, and 

 the characters of the skull were compared with those 

 of Stenorhynchus (Ogmorhinus) leptonyx. Subse- 

 quently Dr David Hepburn has described in Trans. 

 Roij. Soc. Eclin., vol. xlvii., 1909-1912, the viscera 

 of Weddell's Seal, from a young male 51^ inches 

 long, obtained by the Scottish National Antarctic 

 Expedition. 



