176 PSEUDOCERATITES OF THE CRETACEOUS. 
them and those on the first quarter of the same volution. The entire 
fourteen overlap, but the tenth, eleventh, and twelfth are nearer together 
than any others. The ephebic sutures on the first quarter of this same 
volution are well separated. There are eleven slender saddles and ten 
slender lobes on the left side. The first lateral is narrower than in any 
other species and bifid, with tongue-shaped entire arms; the second and 
third laterals are also entire and linguiform; the fourth to the ninth are 
phylliform and bifid; the tenth could not be seen; the eleventh was entire. 
The ventral lobe is narrower, deeper in proportion than in other 
‘species. There is a smaller and contorted cast from Benbrook, Tex., 
with similar sutures so far as the bifidity of some of the principal 
saddles is concerned. It is very likely a variety of this species. The 
markings, so far as can be determined, are similar. The living chamber is 
about one-half of a volution, the last sutures overlap, and the shell was 
evidently in the gerontic stage. The third lateral saddles were bifid, the 
fourth was entire, the fifth to ninth were more or less phylliform and bifid, 
and beyond this none were visible. 
it differs from Protengonoceras emarginatum (Cragin) in having pro- 
nounced lines of tubercles along the ventro-lateral angles and its greater 
number of lobes and saddles, judging from the descriptions of that species. 
The characteristics of the venter and the size as given by him indicate 
a larger species, with venter more like that of Proten. gabbi. A small 
specimen, a cast, from 15 miles west of Denison, Tex., has a diameter 
of 46 mm.; outer part of volution is 23 mm.; transverse diameter, 
11 mm.; umbilicus, 7 mm., and opposite diameter from line of involution to 
venter, 16 mm.; transverse diameter, 7.5 mm. This has same shape of 
venter and general aspect. The nodes of the inner line are present as 
elongated coste, most prominent at the umbilical shoulders and much 
inclined orad. These disappear as they pass the centran lateral surface. 
Nodes could not be seen nor felt over the perfect surface of the cast, and 
none were visible at the beginning of this volution on a small bit of the 
shell of the venter exposed by excavation. 
The sutures in this specimen are crowded together unusually close for 
shells of this genus, the inner lobes and saddles overlapping slightly, 
beginning with the third lobes and fourth saddles. It is probably a 
