PLATE XVI. 



PLATYCERAS CONRADI 182 



Fig. 1. .Lateral view, showing the first volution and the sinuosity of the peristome. 



1 a. Dorsal views of another example, showing the concentric ridges on tho back. 



EUOMPHALUS EUREKENSIS 185 



Fig. 2. Cast of a medium size shell. 



2 a. Lateral view of the cast of a large shell, showing the sinuosity in tlie aperture 



and the decollation of the inner whorls. 



CALLONEMA OCCIDENTALIS 189 



Fig. 3. Lateral view, showing the depressed spine. 



3 a. Vertical view. The lines on the left side are an accidental feature. 



CONOCARDIUM NEVADENSI8 177 



Figs. 4, 4 a. Two views, showing the character of the species. 



LEPERDITIA ROTUNDATA 206 



Fig. 5. Enlargement to four diameters of the right valve. 



SANGUINOLITES RIGIDUS 176 



Fig. 0. Left valve. Natural size. 



STRAP AROLLUS NEWARKENSIS 187 



Fig. 7. Basal view. ^ 



7 a. Summit view of same specimen, enlarged to two diameters. 



LOXONEMA EUREKENSIS 190 



Fig. 8. View of internal cast. 



LOXONEMA NOBtLE , 190 



Fig. 9. View of internal cast. 



