117 



S. Meekella striaticostatii 31 



9. Rhombopora sp 30 



10. Thamniscus sp 30 



11. Bairdia beedei 100 



12. Bairdia beedei abrupta 25 



13. Pteria sulcata 128 



14. Nuculaua bellistriata attenuata 28 



15. Aviculopecten occideutalis 40 



16. Pelecypod sp 200 



17. Bulimorpha chrysalis 25 



18. Bellerophon sp 39 



19. 20. Gastropod, two small species 500 



This list comprises one species of Foraminifera, seven of Brachiopoda, 

 two Bryozoa; two ostracods, four pelecypods, and four gastropods. 



The Fusulina can not be said to be characteristic of the formation as a 

 whole as it is very rare farther north. The brachiopods, as a general rule 

 are somewhat larger than normal. 



One of the most interesting species in the collection is Derby a multi- 

 striata Meek and Hayden. We find the first account of this species by 

 Meek, under the name of Orthisina iinihraculum ( "i) Schlotheim. He de- 

 scribes it as follows: 



"Orthisina umbraculumCi) Schlot. sp. Petrefact. I, p. 256, et 2. p. 67. 

 We find in Kansas ranging from 16 to 19 of the foregoing section, many 

 specimens of a large species of 07'thi.nna, liaving almost the form and other 

 characters of 0. iimbraculum, excepting that the striae appear to be more 

 numerous. According to Koninck that species has about 108 striae on each 

 valve, while on our Kansas specimens, we count from 160 to 200 ; conse- 

 quently we suspect it to be a distinct but closely allied species. If so we 

 would propose to designate it by the name of O. muUiHirlatnm. We find 

 it at Fort Riley and at several localities between there and Blue river, 

 also in the same position on Cottonwood creek."** 



This species is not very abundant in the Florena shale, but in the shale 

 bed just beneath the Wreford limestone, that is, in a horizon higher than 

 this, it reaches its maximum development and becomes one of the pre- 

 dominating species of that fauna. Its characters are a high cardinal area, 

 and a hinge line shorter than the greatest width of the shell. These char 



**Proc. Acad. Nat. Sci. Phil., 1859. p. 26. 



