TEI AI CIN IL 
PLACENTICERAS WHITFIELDI Hyatt. 
(Page 221.) 
Fies. 1, 2. Two views of a large specimen, ;°; actual diameter. 
Black Hilis, South Dakota; Montana formation, Upper Cretaceous; Coll. Bost. Soc. Nat Hist., 
No. 11124. : 
344 
