PLATE XLVI. 
PAGE. 
LEPTAENA RHOMBOIDALIS var. VENTRICOSA (Hall)....... 346 
Fig. 1. A very large, incomplete brachial valve. Peters Valley, 
Locality 53 B. 
RUYNCHONELLA, BREVIPLICA TAN Nu SDuewsie microns os sie) aise 350 
Fig. 2.°A nearly complete brachial valve. Locality 6 A. 
3. A nearly complete pedicle valve. Same locality. 
4. Anterior view of the same. 
RHIPTDOMERUA OBLAT A) (Ea! )) se). cciem «aie ieo clele = slevereheneneks 350 
Fig. 5. A large, incomplete brachial valve. Locality 6A. 
6. An incomplete pedicle valve. Same locality. 
7. Internal cast of an incomplete pedicle valve. Same 
locality. 
IMNOPDEA INU CEMA TAG: (EVA) Py saperecesaceletenetatct= tenets clierratenaerete 349 
Tig. 8. The internal cast of a pedicle valve. Near Layton, Lo- 
cality 87 A. (x2). 
9,10. Two views of a complete pedicle valve. Locality 6A. 
(Geir 
CHONETESU HUDSONTCAy (@lAPKGR art) 12s: a)eeye a shores coneiet ete 347 
Fig. 11. A complete pedicle valve. Locality 6A. 
CHONOSTROPHIA COMPLANATA (Hall)................. 348 
Fig. 12. An incomplete, partial, internal cast of a pedicle valve. 
Near Layton, Locality 37 A. 
(444) 
