216 PSEUDOCERATITES OF THE CRETACEOUS. 
distinct from those of other species and come nearer to those of the old 
whorl of P. placenta from New Jersey than any other form. They are, 
however, smaller, and the apical trend of the outer lobes is less, the third 
lateral being shorter, and the remaining lobes more abruptly separated 
through their extreme shortening up as compared with the third lateral. 
Having received through Professor Martin the specimen described by 
Meek from Tarrant County, Tex.,“ as belonging to P. intercalare, I am able 
to state that it is a good cast of this species. The diameter is 90 mm. 
The living chamber is incomplete but nearly half of a volution in length. 
The median lateral line of tubercles is absent, the inner line of small 
tubercles recedes from the umbilical shoulder, and the ventral tubercles 
are rather coarse and large, and the venter broad as in typical bolli. The 
sutures have the solid short saddles and short lobes of this form. The 
paraphebic substage is reached near the aperture. 
Locality: Elm Fork and West Fork, Dallas County and Tarrant 
County, Tex. 
Age: “Probably Eagle Ford shales” (Stanton) 
PLACENTICERAS PSEUDOPLACENTA Hyatt. 
Pl. XLIII, figs. 3-11; Pl. XLIV. 
Placenticeras placenta (?) Stanton (pars), 1894, Bull. U. S. Geol. Survey No. 106, 
pl. 39, fig. 1 (not figs. 2, 3.) 
The sutures are peculiar and unlike those of any of the forms of true 
P. placenta or whitfieldi. Vhis fact was noticed by Stanton, who considered 
the Colorado species to be different from true placenta. In confirmation of 
these remarks I can add the following: A large fragment, U. S. National 
Museum, locality Upper Kanab, Utah, No. 22344, diameter from line of 
involution to venter 88 mm., greatest transverse about 35 mm., shows a 
wider venter 6 mm. and flatter than in whitfieldi at same age. The side 
which is unaffected by pressure is not so evenly convex as in that species, 
the outer part being very slightly concave, the centran part slightly 
gibbous. The sutures exhibit more complicated outlines than in the 
younger stage figured by Stanton, but they have similar ragged outlines 
and very broad lobes and are obviously the same. <A specimen with 
diameter of 35 mm. has on the last volution sutures with same rugged 
«Mon. U.S. Geol. Survey Terr., Vol. IX, p. 471. 
