PLATE XV. 



Digestive okgaks or Penguins. 



(All till' figures are of the natural size.) 



Fig. 1. — Tongue and floor of nioutli of Pygoxceles tceniatus. 



B. P. Buccal group of papillae. 



L. P. Laryngeal pad, separated from its fellow ^y the superior aperture of 



the laiynx. > 



OL. Commeneement of cesophagus. 



T. Tongue. 



Fig. 2. — Roof of mouth of Pygosceles tmiiatus. 



P Horny plate which completes the palate in front. 



P. G. Apertures of ducts of palatal glands. 

 P. L. Palate covered by papillae. 



Fig. 3.^ — Tongue and floor of moutli of Aptenodytes longirostris. Letters as in fig. 1. 



Fig. 4. — Roof of mouth of Apte>iodytef( lovgirostns. Letters as in fig. 2. 



Fig. 5. — Floor of mouth of Aptenodytes longirostris showing the double row of papilhe 

 with which its margins are provided. 



