164 SPECIMENS OF PINNIPEDIA. 



Scapula, prsespinous larger than postspinous fossa. 

 Humerus without a supracondyloid foramen ; crest 

 of ilium in front of base of sacrum ; femur with 

 rudimentary small trochanter. The last and the 

 penultimate upper molars and the last lower molar 

 sometimes absent. North Atlantic and North Pacific. 



1. Skeleton, adult, articulated. Length 9 feet 4 inches. 



Skull, length in straight line 15 inches, over vertex 

 20 inches. Spine, length 8 feet 1 inch, formula 

 CyDj^LgSgCdy = 37 ; the terminal vertebrae have not 

 been preserved. Ribs, 14 pairs, the last of which, 

 12 inches long, is apparently a floating rib. Sternum 

 is 2 feet 4 inches long, and 2| inches broad about the 

 middle ; it consists of 9 segments, the last of which 

 is tipped with cartilage. The 1st pair of costal carti- 

 lages articulate near anterior end, the 2nd to 9th at 

 the junction of segments, the 10th to 14th do not reach 

 the sternum. Mandible 10^ inches long. Tusk, length 

 of protruded part 16 inches, girth at alveolus 6 inches. 

 Scapula, glenoiclo-vertebral diameter 14| inches ; spine 

 low, acromion short, coracoid feeble, praespinous fossa 

 much larger than postspinous. Humerus 13f inches 

 long; radius lOi inches; ulna with long olecranon 

 13^ inches. Carpus; radiale and intermedium fused 

 together, ulnare, pisiform, four distal carpalia. Digits 

 five, pollex MPh2, the others each MPhg. Os inno- 

 minatum from iliac crest to ischial tuber 154 inches. 

 Femur, head to inner condyl 10 inches; tibia, length 

 13| inches ; fibula 13| inches. Tarsus the customary 

 seven bones ; digits five, hallux MPh,, the others 

 MPh,. 



2. Skeleton, length 8 feet 5 inches. Skull, length in straight 



line 13 inches, over vertex 17 inches. Spine 7 feet 

 3^ inches, formula C^D^^LgS^Cdg = 39. Two or perhaps 

 three caudal vertebras missing ; the fifteenth rib on 

 each side is only 2^ inches long, free and floating ; its 

 presence increases the number of dorsal vertebrae and 

 diminishes that of the lumbar. Sternum consists of 

 nine segments and articulates with the cartilages of 

 nine pairs of ribs. Manus and pes imperfect. 



3. Skull, with tusks and mandible; length 15 inches, over 



vertex 19J inches. Tusk, left, length Hi inches, right 

 9J inches, girth 6^ inches left. Mandible, length 10^ 



11 3 3 



inches. Dentition: c.-^ tt, p.c. , -,. 

 0^ 44 



