THE VOYAGE OF THE ' CHALLENGER.' 437 



PLATE XIII. 



Fig. 1. Head of Fregetta grallaria. 1 a leg and 1 b foot (from before) of same. 



2. 2 a, 2 b. The same of Procellaria pelagica. 



3. Bill of Bulweria columbina. 



4. View of external nares of same, from before, to show their two distinct 



openings. 



5. Nostrils of Oceanites oceanicus, from before. 



6. The same of Procellaria pelagica. 



Figs. 4-6 enlarged. The others are of the natural size. 



PTATV XTV Zool> 



Exp.vcl.iv. 



Fig. 1. Liver, stomach, and duodenal loop of Majaqueus (squinoctialis, viewed from in pt. ii. pi. ii. 

 front. L. Liver ; pr. Proventriculus (the letters are placed on its fundus) ; 

 g. Gizzard ; p. Pancreas ; g.b. Gall-bladder ; r.K.d., l.h.d. Eight and left 

 hepatic ducts ; v.p. Vena portse ; h.a. Hepatic artery. 



2. Palate of Pelecano'ides urinatrix. 



3. Palate of (Estrelata lessoni. 



4. Palate of Fulmarus glacialis. 



5. Palate of Prion banksi. 



6. Palate of Oceanites oceanicus, enlarged. (The line shows the natural size.) 



7. Colic caeca of Majaqueus (squinoctialis, enlarged slightly. 



All the figures, except figs. 6 and 7, are of the natural size. 



PLATE XV. 



Fig. 1. Tongue of Oceanites oceanicus. 



2. Tongue of Pelecano'ides urinatrix. 



3. Tongue of Diomedea brachyura. 



4. Tongue of Phosbetria fuliginosa. 



5. Tongue of Cymochorea leucorrhoa. 



6. Tongue of Aeipetes antarcticus. 



7. Tongue of Daption capensis. 



8. Tongue of Pagodroma nivea. 



9. Tongue of Ossifraga gigantea. 



10. Tongue of Prion banksi. 



11. Tongue of Majaqueus (squinoctialis. 



12. Tongue of (Estrelata lessoni. 



13. Tongue of Larus, sp. ? 



14. Tongue of Puffinus brevicauda. 



15. Outline of stomach, &c., of Fregetta grallaria. 



16. Gizzard of Fulmarus glacialislaid open, to show the character of its epithelium. 



Fig. 1. Left pectoral region of Majaqueus <zquinoctialis, to show the double pectoralis 

 major (seu primus) muscle ; its superficial layer (p. 1 a) has been for the 

 most part removed, its cut origin from the sternal crest and furcula (F.) being 

 reflected : p. 1 a', its insertion into the humerus, also cut and reflected ; 

 p. 1 b, the deep layer ; p. 2, fascia covering the pectoralis secundus muscle ; 



