PLA^TE XV. 



Page. 

 I'^ig. 1. Gykodes depressa 159 



1. Upper view of an iuternal cast. 

 1 a. Side view of same. 



Fig. 2. AnCHUUA ? FUSIFOBMIS 1(50 



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



of the lip not clearly seen. 

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



Fig. 3. Cakdium cortum 151 



Left view of one of the largest specimens, which is an internal cast. 



Fig. 3 a. Cardium subcurtum 152 



A small specimen, right side view. 



Fig. 4. Tellina modesta. Cast of left valve 157 



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 



Fig.7. CypRiMERiit SDBALATA. Internal cast of left valve 158 



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



Fig. 9. Teluna (Abcopagia) ? Utahensls I.''i5 



9. Cast of right valve. 



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



ing to the same species. 



Fig. 10. OsTREA 140 



10. Interior of an upper valve. 



10 a. Outer or upper side of same. 

 10 b. Interior of an under valve. 

 10 c. Outside of same. 



