ILLUSTRATIONS. 



XV 



Monodon monoceros, pulps of teeth, magnified 



J, ,, tympanic bone, left, inferior surface 



„ ,, manus, radiogram . . . • 



„ ,, stomach ...-•• 



Delphinapterus leucas, tympanic Ijone, left, inferior surface . 

 Phocaina communis, animal from photograph . 



„ „ teeth, upper and lower, x 2 . 



„ „ tympanic bone, left, inferior surface 



Cephalorhynchus albifrons, tympanic bone, left, inferior surface 

 Orca gladiator, tympanic bone, left, inferior surface . 

 „ „ periotic bone, left, outer surface 



„ „ chorion, stellate non-villous area opposite the os uteri 



,, ,, uterxis, gravid, mucous membrane of . 



Globicephalus melas, tympanic bone, left, inferior surface 

 „ ,, carpus, right and left, bones of . 



„ „ aorta, pulmonary artery, primary branches 



Grampus griseus, tympanic bone, left, inferior surface 

 ,, ,, stomach 



„ ,, manus, bones of 



Lagenorhynchus albirostris, animal from photograph 

 „ ,, tympanic bone, left, infer 



,, ,, manus, bones of . 



Lagenorhynchus acutus, skull, dorsum . 



„ „ tympanic bone, left, inferior 



„ „ pectoral limb, radiogram 



Delphinus delphis, animal from photograph 



„ „ tympanic bone, left, inferior surface 



„ ,, manus, bones of 



,, „ stomach 



Tursiops tursio, tympanic bone, left, inferior surface 

 Halicore Dugong, foetus 



„ „ right tympano-periotic bone, with tympanic ossicles 



„ „ placenta and foetus . 



„ „ foetus, heads of 



„ „ face and pectoral region 



Manatus senegalensis, right tympano-periotic bone 

 Trichechus rosmarus, cerebrum, cranial surface 

 „ „ ,, mesial surface 



Eumetopias californianus, skull 

 Arctocephalus pusillus, hard palate 

 Phnca hispida, recent and fossil mandibles 



,, „ mandible, fossil . 



Phoca, species ? humerus 

 Macrorhinus leoninus, base of brain 



,, ,, mesial surface . 



Leptonychotes weddelli, foetus in utero 

 Ommatophoca rossi, dorsum of skull 



:0V surface 



surface 



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