IPI AID be WE 
SPHENODISCUS. 
Fies. 1-3. Sphenodiscus pleurisepta (Conrad) 
Figs. 1, 2. Fig. 2 is restored in the lower part. The venter, where it is covered by 
the shell, is slightly more acute than is shown in the drawing. Near 
Eagle Pass, Tex.; Upper Cretaceous. Coll. U. 8. Geol. Survey. 
3. Ventral view of same fossil as figured in PI. III, fig. 15. Coll. Colum- 
bia University, No. 10881e. 
Fie. 4. Sphenodiscus stantoni Hyatt 
Fig. 4. The sutures do not show very well in this, and an enlarged view of the 
first six saddles is given on Pl. VI, fig. 5. Same locality, age, and col- 
lection as figs. 1-2. 
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