67 



The fresh-water mussel (Anodonta cygnea) dissected so as 

 to show the alimentary canal and nervous system. Ld. 25. 



The anatomy of the human lung, after Aeb} 7 . Aa. 116. 



The anatomy of the respiratory organs of the sloth (Brady- 

 pus). Ga. 29. 



The anatomy of the air-sacs of the duck, after Stroner. He. 92. 



The ventral air-sacs of the pigeon with the humerus. 

 He. 93. 



The sternum and trachea of the crane. He. 95. 



The structure of the lung of the goose, after Strieker. 

 He. 98. 



The sternum and trachea of Nothocrax and Phony gama. 

 He. 100. 



The skeletons of the wolf and man placed side by side for 

 comparison. Ca. 33. 



The right pes (dorsal view) of the wolf and man. Ca. 34. 



The right manus (dorsal view). Ca. 35. 



The skull of the wolf and man superposed to show the diffe- 

 rent form of the corresponding parts. Ca. 36. 



The bifurcation of the bronchi, Aeby. A. x 2. 



The alveoli of the lucg of the ape and the cat. A. x 3. 



The histology of the lung. A. x 4. 



Larval oyster. Ld. 39. 



The rabbit (Lepus cuniculus) dissected from the side. 

 Be. 33. 



The intestinal epithelium of the frog and the rat, showing the 

 process of absorption, after Schafer. Be. 38. 



The general arrangement of the circulating organs in the 

 rabbit. Be. 42. 



The anatomy of the lungs in the rabbit. Be. 43. 



A transverse section of the thorax in the rabbit. Be. 44. 



The anatomy of the lungs of the porcupine (Hysti'ix). 

 Be. 45. 



The anatomy of the ear of the rabbit. Be. 35. 



The histology of the ear of the rabbit. Be. 36. 



The general arrangement of the circulatory organs in the fish. 

 Kb. 33. 



The fresh- water mussel (Anodonta cygnea) dissected so as to 

 show the shell, the heart, and the muscles. Ld. 24. 



The fresh-water polyp (Hydra fusca and H. viridis) show- 

 ing the external characters, the genitalia and the thread cells. 

 Nb. 25. 



The fresh-water polyp (Hydra sp.) showing its minute struc- 

 ture. Nb. 26. 



The fresh-water polyp (Hydra sp.) showing the cells of the 

 inner layer or endoderm. Nb. 29. 



The development of the fresh-water polyp, Hydra sp., after 

 Kleinenberg. Nb. 27. 



Various forms of the proteus animalcule (Amceba), after Leidy 

 Qa. 2. 



