white.] CEETACEOUS FOSSILS OF COALVILLE, UTAH. 235 



li. Volsella (BracJiydontes) mult Hi nigera Meek. 



This species was found in the sandstones of the first ridge at Coalville. 

 I have also found examples, probably of the same species, in apparently 

 equivalent strata, hi the valley of Bear Eivcr, some thirty -five miles to 

 the northeastward of Coalville. 



15. Barbatia eoalrillensis, White. 



A considerable number of examples of this species were also found in 

 the sandstones of the first ridge shown in Mr. Meek's section. It seems 

 never to have been discovered elsewhere. 



10. Maeradon f 



The examples referred by Mr. Meek to Macrodon have never been seen 

 by me. An imperfect example found by me, and apparently referable 

 to this genus, indicates a rather large elongate species. 



17. Unio ? 



See remarks under head of No. 29. 



18. Ludna ? • 



The few examples found were obtained from No. 3 of Meek's section. 

 They seem to indicate a species closely allied to, if not identical with, 

 L. subundata Hall & Meek. 



19. Card turn curtum Meek & Hayden. 



The proper horizon of the types of this species, which were obtained 

 by Dr. Hayden on the Gros Ventres liiver, Wyoming, seems not to have 

 been ascertained. It is therefore of no present value for the purpose of 

 correlating those strata with those which contain this species at Coalville. 



20. Gardium subcurtum Meek. 



Besides the specimens obtained from No. 3, of Meek's section, I ob- 

 tained others from some of the sandstones of the third ridge, which is 

 much higher in that series. I also obtained some examples of it near 

 Old Bear River City, which were associated with forms which indicate 

 that the strata there belong to the Fox Hills Group. 



21. Cyrena carletoni Meek. 



The differences between the recognized genera Cyrena and Corbicula 

 are so slight as to be of doubtful generic importance as regards fossil 

 shells. I am not acquainted with any species from the Cretaceous strata 

 of the West, except the one in question, that is referable to either of 

 these generic forms, the examples of which have the hinge so perfectly 

 preserved as to show the crenulations of the lateral teeth if they had 

 ever existed. I have, therefore, referred all such to Cyrena, although 

 in outward form they closely resemble some of those Laramie shells that 

 I refer to Corbicula. This species, however, seems to have been entirely 

 without crenulations of the lateral teeth, and Mr. Meek has no doubt 

 correctly referred it to Cyrena. As to its associates, see remarks under 

 5To. 29. 



22. Cyprimcria ? subalata Meek. 



The examples of this and the three following species collected by me 

 afford no further information concerning their characteristics than is re- 

 corded by Mr. Meek in vol. iv., U. S. Geol. Sur. 40th Parallel. 



23. Tellina ? isonema Meek. 

 See remarks under No. 22. 



