PLA DE XT. 
BELLEROPHON MAJUSCULUS « ...--- ccce eoccce cncnee woe cnnnee ence ns coc nce = cn cens cesses cecece 
Fig. 1. View of aperture, callus, and body-whorl. Natural size. 
la. Lateral view of fig. 1. 
ORTHOCERAS EUREKENSIS....-.---------+--2- 2-02 ses eee eee ee eee teen ee eee ee paces cneco: 
Fig. 2. Lateral view, showing curvature of the chambered portion of the tube. Natural 
size. 
2a. One of the septa, with the small siphuncle and areole about it. 
EDO EU TEES | CARBON ARUAGstotere e watet clatter te tale ta eee Soecoes 
Fig. 3. Enlargement to three diameters of the type specimen. 
CONULARIA MISSOURIENSIS .... ..--5--- 2200 scence oone cece ee pa oscoodersocecs mobsnscoonececs 
Fig.4. A crushed specimen, Natural size. 
MACRODON) SIAMELTONAD oe -aeaeele oases eas selvesise ces nceeeme item ccne tee see 
Fig. 5. Cast of right valve. Natural size. 
5a,b. Casts of left valve. Natural size. 
5e. Enlargement of the surface of another specimen,to show the characteristic 
radiating and concentric lines. 
EDMOND IAW MED ON fee tets ete eet al erate new tea el a 
Fig. 6. Right and left valve. Natural size. 
SANGUENOEYTES) STRIATUS ie ace eee eae nase se eaela eee ane tee es eee nas ase e=heee saa leme sales 
Fig. 7. Left valve. Natural size. 
264 
264 
_ 243 
245 
