JP 1 AN IPI XS Wye 
PLACENTICERAS. 
Fias. 1, 2. Placenticeras placenta (Dekay ) 
Fig. 1. Peripheral view of specimen represented by Pl. XXXINX, fig. 5. 
2. Side view of same, enlarged nearly two diameters. 
Figs. 3-7. Placenticeras stanton var. bolli Hyatt 
Figs. 
3,4. Aperture and side views of the small specimen from Tarrant County, 
Tex., in the Martin collection, Rutgers Female Institute, described by 
Meek as P. intercalare. 
5. Suture of same, * 2. 
for) 
. Fragmentary specimen from Horton’s mill, Dallas County, Tex.; Coll. Mus. 
Comp. Zool., Cambridge. 
7. Lateral and internal suture of same, xX 2. (See Pl. XLI.) 
Taylor beds (?), Upper Cretaceous. 
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