109 
DEPARTMENT OF ZOOLOGY. 
The collections of the Department of Zoology are very exten- 
sive, covering fully this held of science from Protozoa to man. 
The classihcation begins with the lowest forms of life, in Hall 
24, and follows in ascending scale through the halls in serial or- 
der. The sequence of halls may be tabulated as follows : 
Hall 24. Lower Invertebrates. 
Hall 25. Higher Invertebrates. 
Hall 26. Ornithology. 
Hall 27. Osteology. 
Hall 20. Systematic Collection of Vertebrata. 
The collections of Aves properly belongs, in the classihcation, 
between the Reptilia, in ease 61, and the Order Monotremata, of the 
Mammalia, in case 62, A. The collections are especially rich in sev- 
eral divisions, as for example: the Sub-kingdo 7 n Mollusca^ in which 
is nearly every family, genus and sub-genus, at present described; 
also the collection of cordAs (Sub-kingdo 7 n Ccelenterata)vf\i\c\i is un- 
usually rich in species of great interest. The Osteological collec- 
tion is one of great value, and contains many very rare specimens. 
The classihcation adopted is essentially that of the best Ger- 
man and French sava^its, with such additions as modern American 
investigations have made necessary. 
