106 SPECIMENS OF CETACEA. 



10. Dorsal tin, dried, falcate ; the anterior border is roughened 



through the presence of low tubercles. From No. 3. 



11. Dorsal tin of young Porpoise, base 6| inches, height 2| 



inches ; anterior border 5^ inches, rough, with about 

 twenty low tubercles projecting from the free border. 



12. Caudal tin, dried, showing the mesial notch and the con- 



cave border to the tip on each side. From No. 3. 



18. Heart of a well-grown Porpoise, showing well-marked 

 inter- ventricular grooves ending in a definite notch 

 near the apex. 



14. Heart of a small Porpoise ; the cavities and great vessels 



have been opened into to show the valves. 



Goodsir Collection. 



15. Rete mirabile with heart of Porpoise and the adjacent 



wall of thorax. The aorta gives origin to a branch 

 which ends in the rete mirabile on the superior wall 

 of the thoracic cavity. Goodsir Collection. 



16. Larynx of Porpoise, showing the relation of the windpipe 



to the nasal chamber. On the inferior surface the 

 liyoid apparatus has been dissected. 



Turner Collection. 



17. Larynx of Porpoise, showing the pyramidal projection of 



the windpipe, which projects into the nasal chamber ; 

 its neck is surrounded by a marked sphincter muscle. 

 Prepared by Dr T. Spencer Cobbold. 



18. Stomach of Porpoise, inflated and dried. It consists of a 



paunch-like (esophageal compartment ; a cardiac com- 

 partment in which are numerous folds of mucous 

 membrane running mostly longitudinally ; a small 

 intermediate compartment and a long tubular pyloric 

 compartment, which opens into the dilated commence- 

 ment of the duodenum. See for microscopic structure 

 Turner's memoir in Journ. Anat. and PJrys., vol. xxiii., 

 1889. 



19. Intestine, small, of Porpoise inverted and injected. The 



valvulse conniventes are arranged longitudinally. 



Goodsir Collection. 



20. Kidney of Porpoise, vessels minutely injected. The 



numerous small lobules are displayed ; the capsule has 

 been removed. 



21. Kidney, a similar preparation. Goodsir Collection. 



22. Brain of Common Porpoise exposed in the skull. 



23. Brain of Common Porpoise cut into sections. 



