PLATE XVI. 



Digestive organs of Penguins, 



Fig. 1. — Interior of stomach of Eudyptes chrysolophus ; half natural size. 



D. Duodenum. 



M. S. Muscular portion of stomach (gizzard). 



CE. (Esophagus. 



P. G. Proventricular gland. 

 Pio-. 2. — Interior of stomach of Spheniscus demer.sus ; half natural size. Letters as in 



fig- 1- 

 Ficr. 3. — Interior of stomach of Spheniscus magellanicus ; half natural size. Lettei-s as 



in fig. 1. 

 Fig. 4. — Interior of stomach of Spheniscus mendiculus ; half natural size. Letters as 



in fig. 1. 

 Fig. 5.— Spleen oi Eudyptes chrysocome, from Kerguelen ; natural size. 

 Fig. 6. — Spleen of Eudyptes chrysolopjhus ; natural size. 

 Fig. 7. — Spleen of Spheniscus demersus ; natural size. 

 Fig. 8. — Spleen oi Spheniscus nuigellanicKs ; natural size. 



Fig. 9.. — Dissection of Spheniscus demersus, to show the relative positions of tlie th(:>rfir'i<- 

 and abdominal viscera in the Spheniscidre. 



C Cloaca. 



C. A. Carotid artery. 



C. T. Cleido-thjrroid muscle. 



G. B. Gall bladder. 



H. Heart. 



/. Small intestine. 



L. L. Lungs. 



LI. LI. Liver. 



(E. (Esophagus. 



^Sl Stomach. 



S. A. Subclavian artery. 



S. T. Sterno-tracheal muscle. 



T. Tongue. 



T. II. Thyro-hyoid muscle. 



Tr. Trachea. 



V. C. S. Vena cava superior right and left. 



