12 A IDID) D-\Y 1Ee 
PEATYCERAS CONRADLI .....- 2-2. -cnenenncnnwieneens (oon en nen n= een ree = orem nen onsen n= anne 
Fig. 1. Lateral view, showing the first volution and the sinuosity of the peristome. 
la. Dorsal views of another example, showing the concentric ridges on the back. 
EXUOMPHADUS) OREKENSIS) 3 -(o102 0) ommtes cee Sale ee nema la oa elete oleate otal elated 
Fig.2. Cast of a medium size shell. 
2a. Lateral view of the cast of a large shell, showing the sinuosity in the aperture 
and the decollation of the inner whorls. 
CATTEONEMATOCCIDENTADIBI = sac ce ioc sees sae eee ee eal =e a) eee eects on seen 
Fig. 3. Lateral view, showing the depressed spine. 
3a. Vertical view. The lines on the left side are an accidental feature. 
CONOCARDIUMG NEWADENSIS eo some 2 sei =a[= 9 = eee eee eae ee aaa ela teeete 
Figs. 4,4 a. Two views, showing the character of the species. 
LEPERDITIA ROTUNDATA....... .. 2-22 2020 20-2 202 = oon eon ne nen ee ne teen eee ne wane conn none 
Fig. 5. Enlargement to four diameters of the right valve. 
BANGUINOUEDES RIGID US iso siesta gate areal ai ee ae oer ee eee eel are tetera eter 
Fig. 6. Left valve. Natural size. 
StRAPAROLLUS NRWARKENSI Sse hice sai cae eae cinco ae alc emine aaiee is alent = cleeninetcial sociale = setanets 
Fig. 7. Basal view. 
7a. Summit view of same specimen, enlarged to two diameters. 
LLOXONEMA) DUREKENSIS seeessee ete ae ence eee ae ae ee a eat eral aera a ale teeta ote meal el 
Fig. 8. View of internal cast. 
LOXONEMA NOBILE...- .-..-- --- 22 - 2202 cone cone oe enn cece cone coe cee s cone cece cece meee anne 
Fig. 9. View of internal cast, 
182 
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206 
176 
187 
190 
190 
