11,^-^0. BULLKTIN 



OF THE 



SGientific Laboratories 



OF 



DENISON UNIVERSITY. 



VOL. VI. PART II. 



WITH FIVE PLATES. 



EDITED BY 



W. G. TIGHT, M. S., 

 Department of Geology and Natural History. 



COKTKKTS : 



PAGE 



Notes upon the Cladocera, Copepoda, Ostracoda and Rotifera of Cincin- 

 nati, with Description of N«w Species. Plates I-II. C. H. Turner— 57 



The Cerebrum and Olfactories of the Opossum, Didelphys mttk Virginica. 



Plates A, Basd C. C. L. Herrick 75 



GRANVILLE, OHIO, JANUARY, 1892. 



