XVI LIST OF ILLUSTRATIONS. 



Fig. 50, p. 633. Phoca groelandiea, animal. 



Fig. 51, p. 691. Halichcerus grypus, animal. 



Fig. 52, p. 727. Oystophora cristata, animal. 



Fig. 53, p. 728. Oystophora cristata, skull in profile. 



Fig. 54, p. 729. Cystophora cristata,, skull from above. 



Fig. 55, p. 730. Oystophora cristata, skull from below. 



Fig. 56, p. 731. Oystophora cristata, lower jaw. 



Fig. 57, p. 744. Macrorhinus angustirostris, skull in profile. 



Fig. 58, p. 745. Macrorhinus angustirostris, skull from above. 



Fig. 59, p. 746. Macrorhinus angustirostris, skull from below. 



Fig. 60, p. 747. Macrorhinus angustirostris, lower jaw. 



