PLATE XXVII. 



Page. 

 ParaphoIas sphenoideus White 125 



Figs. 1, 2. Two views of one of fclie type specimens (alter White). 



C<> R1U J LA .NKAIATOIMIOKA Meek 124 



Figs. 3, 4. Right valves oi'the ordinary size (after White). 



COEBULA KANABBNSIS ll. Sp 125 



Fig. 5. Left valve. 



Nat. Mus. Cat. Invert. Foss., 22900. 

 6. Right valve. 



CORBULA SUTRIGONALIS M. & II.? 123 



Nat, Mus. Cat. Invert, FoSS., 22901. 

 Fig. 7. Left valve with portion oi'the surface restored. 

 8. Small right valve. 



MACTRA EMMONS] Meek 121 



Nat. Mus. Cat. Invert. Foss., 22902 and 22903. 

 Fig. !>. Small right valve from Huerfano park, Colorado. 



10, 12. Two views of a larger left valve from same place. 



11. Cast of left valve from Coalville, (Mali. 



13. Cast of right valve from Huerfano park, Colorado, showing pallia! 

 sinus. 



MACTRA HUERFANENSIS ll. sp 122 



Nat, Mus. Cat, Invert . Foss., 22904. 

 Fig. 14. Cast of right valve showing pallia! line. 



15. Cast of a more elongate right valve retaining portions of the shell. 



MACTRA (CYMBOPHORA) UTAIiKNSis Meek 120 



Fig. 16. Cast, Of a right valve (after Meek). 



17. Cast of another right valve differing in outline (after Meek). 

 246 



