Te 1b ACAD 19) DON ITIL, 
PLACENTICERAS. 
Page. 
Hie. 1; Placenticeras sancarlosense var. seudosyriale Eiyatt 222222222222 222 eee eee eee 200 
Fig. 1. Aperture view of specimen figured on Pl]. XX NIT. 
ies: 2-44 -Rlacenticenas plant Ely alitesaee Seen ae eer eee ee See eee eee eee eee 202 
Fig. 2. Aperture view of medium-sized specimen partly restored. 
3. Side view of same. 
4. Peripheral view of another specimen showing less development of nodes. 
(See Pl. XXXIV, fig. 1.) 
San Carlos, Presidio County, Tex.; San Carlos beds, Upper Cretaceous; Coll. 
U. 8. Geol. Survey. 
