ADDITIONS. 



PAGE 12, paragraph 2. Cilia present in alimentary canal of fishes. (Stan- 

 nius.) 



Page 22, paragraph 3. Compsognathus, a genus of Dinosaurian reptiles; 

 possesses in the construction of its posterior extremities features recalling 

 those of the birds. 



Page 25, paragraph 4. Loxosoma, a genus of naked Polyzoa. (Clara- 

 pdde.) 



Page 30, second line from top. The Y-shaped bones placed below the 

 'bodies of the caudal vertebrae are more properly recognized as " chevron 

 ^bones." 



Page 37, paragraph 3. Invcrtebrata is a term of convenience employed 

 in speaking of animals not included within the Vertebrata. It is not consid- 

 ered to have any systemic significance. 



Page 45, sixth line from top. Paramecium may improvise an anus. 



(118-) 



