XVI LIST OF ILLUSTRATIONS. 



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



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



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



Fig. 53, p. 728. Gystophora cristata, skvXL in profile. 



Fig. 54, p. 729. Oystophora 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. 



