1870.] ■*'^" [Haydou' 



Cketaceous Species. 

 Fountain Creek, Colorado City, Colorado. 



1. Inocerajnus (undt. sp.) Cret. No. 4 



2. Baculites compresstis, Say. " 



3. Baculites ovatus, Say. " 



4. Scaphites Cheyennensis, Owen. " 



5. Scapliites nodosus, Owen. " 



6. Scaphites Conradi, Morton.' " 5 



7. Ammonites placenta, De Kay.^ " 4 



8. Inoceramus proMematicus, Sclilot. (sp.) "3 



9. Osirea congesta, Conrad. " 



10. Inoceramus {nndt.large gibbons distorted sTp.) " 



11. Ammonites (undt.) " 2 or 3 



Miser Station, TT. P. R. B., Oct. 19tli. 



12. Inoceramus (undt.) Cret. No. 4. 



13. Baculites ovatus, Say. " 



N'ear Canon City. 



14. Bivalve (undt. sp.) Cret. No. 4 



15. Baculties ovatus, Say. " 



Iledicine Bow Station. 



16. Inoceramus (undt). Large sp. No. 4 Cret. 



Mission Station, W. P. B. B. 



17. Inoceramus (undt. sp). Cret. No. 4. 



18. Ammonites (undt). 



19. Caprina (undt). 



Between Denver and Cheyenne. 



20. Inoceramus (large undt. sp). 



Six oniles east of Como Station, U. P. B. B, 



21. Inoceramus (undt. sp). 



Valley of Fountain Creek, Colorado. 



22. Anisomyon (undt. sp). No. 4 Cret. 



Bed. Between Hard Scrabble and St. Charles. 



23. Inoceramus problematieus, Schlot. (sp). Cret No. 3. 



24. Ostrea congesta, Conrad. " " 



Medicine Bow Biver. 



25. Inoceramus fragilis. Hall and Meek. No. 2 Cret. 



26. Scaphites Warrenana, M. & W. " " 



27. Ammonties serrato-carinatus. Meek. Cret. No. 2. 



Shell attaining a rather large size ; discoid, with periphery provided 

 with a very narrow, prominent, serrated mesial keel, including the siph- 

 uncle. Volutions increasing rather gradually in size, somewhat com- 



> I propose for the group of Scaphites, of which this may be regarded as the tj'pe, the sub- 

 generic name, Discoscaphites. 

 2 This may bs regarded as the type of a group, for which I propose the name Placeiitocerus. 



A. P. S. — VOL. XI. — 26e 



