DE AP OIL EET 
PLACENTICERAS. 
: Page. 
Fies. 1, 2. Placenticeras stantoni var. bolt Hyatt....--..----------------------+-------------- 214 
Fig. 1. Side view of small costate specimen. 
2. Suture of same, > 2. ; 
Horton’s mill, Dallas County, Tex.; Taylor beds (?), Upper Cretaceous; Coll. 
Mus. Comp. Zool., Cambridge. ; 
Figs. 3-11. Placenticeras pseudoplacenta Hyatt.......-..--.---------------------------------- 216 
Fig. 3. Side view of small fragmentary specimen. 
4. Sectional view of same. 
5. Center of same enlarged. 
6. Ventral view of first whorls of same specimen much enlarged. 
7, 8. Inner whorls of another specimen, natural size. 
, 10. Lateral sutures of last whorl of same as indicated on fig. 7. 
Upper Kanab Valley, Utah; Colorado group; Upper Cretaceous; Coll. U. 8. Nat. 
Mus., No. 22344. 
11. Parts of internal sutures of ephebic stage when dorsoventral diameter of 
? 
yolution measures 49 mm. 
Muddy Creek, Huerfano County, Colo.; Fort Benton formation; Upper Cre- 
taceous; Coll. U. 8. Nat. Mus., No. 22199. 
