ENGONOCERATID 2. 175 
resemblances to those of the older stages of this species than to any others. 
The ventral lobe is narrow and slightly asymmetrical to the left, but the 
first lateral saddles on both sides are alike. They are both bifid, the outer 
arm is entire but is blunter than usual on the venter. The first to sixth 
saddles are otherwise like those of the specimen described above; the sev- 
enth to ninth saddles, seen only on the left side, are symmetrically bifid, the 
tenth is entire. This bifidity of the internal saddles agrees with those of 
uddent, but the aspect of the volution and the general form of the saddles 
and lobes agree better with those of this species. 
Locality: Cook County, Tex., 15 miles southwest of Gainesville and 
15 miles west of Denison. 
Age: Fredericksburg division of Comanche series. 
EXNGONOCERAS STOLLEYI Bohm. 
P). XXII, figs. 7-9; Pl. XXIV, figs. 1-5. 
Engonoceras stolleyi Bohm, 1898, Zeitschr. Deutsch. geol. Gesell., Vol. L, pl. 5. 
This species has the flattened venter, becoming alternately nodose and 
zigzag in old age, as is characteristic of this genus. It is not distinguish- 
able from EF. pierdenale except in the sutures. 'The lateral saddles and lobes 
are smaller than in any other species of this genus, and the first lateral 
saddles are apt to have the inner marginal saddles tongue-shaped. This 
peculiarity is noticeable in Bohm’s figure and in the large fossil (Pl. XXIV, 
fig. 5). 
Age: Fredericksburg group [?], Comanche series, Lower Cretaceous. 
ENGONOCERAS COMPLICATUM n. sp. Hyatt. 
Pl. XXIV, figs. 6-8. 
This is founded upon a cast from near Austin, Tex. The whole 
diameter, partly estimated, is 73 mm., the outer volution is 39 mm., the 
umbilicus 9 mm., the volution opposite (estimated) 25 mm. By the cast 
alone this species could not be separated from Hngonoceras gibbosum, but 
the sutures are nevertheless entirely different. A better preserved specimen 
might, however, show some external characteristic distinctions. There are 
fourteen sutures visible on the outer volution; then comes a gap between 
