152 DR. 0. F, SOiTNTAG ON THE ANATOMY 



may contain a viscid oi* glairy substance which pi'otects the 

 mucous membrane from being injured by prolonged immersion 

 in the water. I also observed numerous pits on the roof of the 

 mouth and on the tongue in fresh-water and marine fishes. 

 But the}' are not so numerous in the Pinnipedia, as might be 

 inferred from a comparative study of the habits of tliese groups 

 of animals. Poulton (26) believes that the large glands in the 

 bill of OrnitJiorhynchus secrete a substance which protects the 

 delicate integument. The glands may also be numerous in 

 the Cetacea because salivary glands are absent. 



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