PLATE XXX 



PAGE. 



Fig. 1. Spiuifer suborbicularis 523 



1 a. Dorsal view ; L 6, view of ventral val*ft. 



1 d. Profile view showing the beaks. 



Fig. 2. Spirifek neglectus 523 



2 a. Profile view ; 1 c, front view. 



Fig. 3. Spirifer fastigatus 521 



3 a. Dorsal view sbowing cardinal area. 

 3 b. View of the ventral valve. 



Fig. 4. Pinna subspatulata 524 



Fig. 5. Myalixa Keokuk 524 



View of a left valve. 



