IP I AL hy XIII, 
MeETOICOCERAS. 
EMG Sale PamVMELOUCOCEN CLS? SUUCLLLOt I (US LNT eam: ClO) tees ee eee eee reo 118 
Fig. 1. Same as Pl. XI, figs. 20-23. First three saddles and two lobes of lateral 
suture, X 12, to show mode of division of saddles and their distinct 
marginals at this late neanic substage. 
2. Grayson County, Tex; Coll. D. 8S. Martin. 
EGS eio=psMCLOUGOCEN CIS WAU ILE Cy lly yieLU Ue aes et aaa eee 122 
Fig. 3. Shows shell on part of outer volution and how little this differs from the 
cast. 1 
4. Shows this also as well as the rounding of the living chamber on the venter 
in old age. See also younger suture from opposite or left side; Pl. XIV, 
fig. 10. 
5. Last suture of another specimen of about the same size as fig. 4. 
Upper Kanab Valley, Utah; Coll. U.S. Nat. Mus. 
