ENGONOCERATID &. Ne 
in length to the line of involution and are entire. On the opposite or left 
side there are ten saddles and eleven lobes. The tenth saddle is completed, 
and there is a small lobe on the line of involution. The first saddle is 
narrower and the eighth and ninth saddles broad, and both similar to the 
ninth on the right side in being bifid. On both sides the first five lobes 
are long, and the same change occurs in the shortness of the sixth and 
remaining lobes and saddles. The matrix is similar to that which occurs in 
the Colorado formation at Horton’s mill, Dallas County, Tex. 
Locality: Texas. 
Age: Stanton suggests Upper Cretaceous from the matrix. 
PROTENGONOCERAS ? EMARGINATUM (Cragin).“ 
Sphenodiscus emarginatus ? Cragin, 1893, Geol. Surv. Texas, Fourth Ann. Rept., 
p. 245. 
This species is described as having straight distinct ventral channel at 
the diameter of 90 mm. and also as having two rows of feeble tubercles, one 
on the umbilical shoulders and the other midway on the lateral aspect. 
The bilobed saddles mentioned by Cragin indicate a more complicated 
suture line than occurs in Protengonoceras as far as known, but the condition 
of the venter indicates that genus. 
Not having seen any specimens of the species, I can not say positively 
that it is a member of this genus. : 
Locality: 2 miles south of Pleasant Point, Tex. 
Age: Comanche series, Walnut beds. 
ENGONOCERAS Neumayr. 
Although the descriptions and figures of Engonoceras pierdenale led me 
to believe that this species had an acute venter, Bohm” has stated, after 
studying the fragmentary originals, that these had truncated concave venters, 
bordered by ventro-lateral ridges or elongated tubercles, and that the species 
upon which the genus Engonoceras was founded, Anum. pierdenalis v. Buch, 
closely resembles his Eng stolleyi. The two fragments figured by B6hm do 
not show conclusively that this is the fact, but it appears to be safest to 
follow him in the effort to give stability to von Buch’s name and Neumayr’s 
genus. Von Buch’s and Roemer’s descriptions lead to the belief that the 
aSee p. 177, where this species is referred to Hngonoceras.—T. W. S. 
bUeber Ammonites pedernalis v. Buch: Zeitschr. Deutsch. geol. Gesell., Vol. L, 1898, p. 183. 
