ARCTOCEPHALUS. 177 



2. Stomach of a Seal, dried, probably from A. pusillus. 

 It contains a number of smooth pebbles, flattened 

 at the sides, from the size of a coffee bean to a diameter 

 of Ih inch. It was sent from the Cape of Good 

 Hope and labelled " Seal's Ballast Bag." 



Challenger Collection. 



(4) ARCTOCEPHALUS GAZELLA. (ArC. GA.) 



(Kerguelen Island Fur Seal.) 



Otaria (Arctophora) gazella, Peters, Monatsbericht, 'j^^^'^uss. 

 Akad. d. Wiss., 1875, 1876. 



Sagittal crest absent ; tympanic almost flattened ] 

 mastoid moderate ; upper and lower post-canines 

 with one large cusp and no secondary cusp ; 6th 

 post-canine much smaller than the others. 



1. Skeleton, not adult, vertebral plates and epiphyses not 



fused. Length of spine along curve 8 feet 7h inches, 



of skull 8^ inches ; total length of skeleton 4 feet 3| 



inches. Vertebral formula C^D^^LgSoCd^o^SO. Ribs, 



flfteen pairs. Sternum, nine segments. Scapula 



falcate, diameter between angles 7^ inches, glenoido- 



vertebral 5^ inches, praespinous about three times 



larger than postspinous fossa, acromion rudimentary, 



no coracoid. Humerus 6 inches long, no supracon- 



dyloid foramen; radius 5| inches; ulna 6| inches, 



with large olecranon. Manus pentadactylous, digits 



diminish in length from pollex to minimus. Pelvic 



bone 5f inches long ; iliac crest directed forwards and 



outwards ; femur 3| inches ; tibia and fibula partially 



fused at upper end, tibia 6i inches, fibula 5| inches. 



Pes digits almost equal in length ; tarsalia, eight bones 



with an entoscaphoid. Length over vertex 1 1 inches ; 



zygomatic breadth 4f inches. Palate slightly concave 



on surface, Sh inches long ; posterior border concave 



from mid suture to pterygoid 1 inch. Mandible length 



6 6 

 5 1 inches. Dentition : p.c. ^ ^ , not closely set, small 



diastema between upper 5 and 6. Peters examined 

 this skull and considered it to be an example of 

 A. gazella. 



The characters of the skeleton in ^4. australis and 

 A. gazella are compared with each other by Turner 

 in Challenger Report on Seals. Kerguelen Island, 

 Fuller's Harbour. Challenger Collection. 



12 



