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Fig. 1. Gyrodes depressa ■. 159 



.,- 1- '. 1. Upper view of an internal cast. 

 1 a. Side view of same. 



Fig. 2. Anchura? FUSiroBMis 1 160 



2. External cast of a specimen with the apex of the spire broken away, and the outline 

 of the lip not clearly seen. 

 .c\ i/2a. A smaller specimen, with the lip and the extremity of the canal broken away. 



Fig. B.^Cardium curtum : ; 151 



. r^<j Left view of one of the largest specimens, which is an internal cast. 



Fig. Sfa. Cardidm subcurtum 152 



fS-''- • A small specimen, right side view. 



Fig. 4. Tellina MODESTA. Cast of left valve .' 157 



V Fig. 5. Tellina ? modesta. Cast of a larger left valve, possibly of this species 157 



Fig. 6. Tellina? isonema. Left view of a cast of exterior 156 



vFifi^.' Cyprimeria? subalata. Internal cast of left valve 158 



Fig. 8. Mactra ? Emmonsi. Cast of outside of left valve, two diameters. 153 



/Ipig. 9. -Tellina (AkcoPAGiA)? Utahensis 155 



\^ 9. Cast of right valve. 



.^ 9 a-6. Two other casts of right valves, differing somewhat in form, but probably belong- 

 j ing to the same species. 



Fig. lO. OSTREA 140 



^ 10. Interior of an upper valve. 

 N 10 a. Outer or upper side of same. 



10 6. Interior of an under \'alve. 



10 c. Outside of same. 



