XVI LIST OF ILLUSTRATIONS. 



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



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



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



Fig. 53, p. 728. Cystophora cristata, skull 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. 



