WHITE.] LARAMIE FOSSILS FROM BEAR RIVER VALLEY. 245 



under Goniobasis. It is described in Powell's Eeport on the Geology of 

 the Uiutii Mountains, p. 122. 



25. Goniobasis chrysalUs Meek. 



Described in An. Eep. U. S. Geol. Sur. TeiT. for 1870, p. 31G. (See 

 remarks under No. 24.) 



2G. Goniobasis chrysaloidea White. 



Described in Powell's Eeport on the Geology of the Uinta Mountains, 

 p. 123. The iigure given by Professor Hall in Fremont's Exploration 

 of Oregon and Xortheru California of his Cerifhium Frcmonti so nuich 

 resembles this species as to suggest the i30ssibility that it may be iden- 

 tical. (See remarks under j!^o. 24.) 



27. Goniobasis endUclii White. 



This is rather a rare species, having been found only in the lower beds 

 seven miles northward from Evanston, where it is associated with the 

 common species of those beds. It posesses tiie raised revolving lines of 

 the three foregoing species, but is without their longitudinal varices or 

 ridges. It is described in the Bull. U. S. Geol. and Geog. Siu\ Terr., 

 vol. iv, p. 716. In the Evanston coal-mines some fragments of a species 

 have been obtained which indicate that it resembles this in its siuiVice 

 markings, but that it is a smaller and more slender species. 



28. Pi/rgulifera liumerosa Meek. 



This is one of the most abundant and characteristic species of the 

 lower beds of the Laramie Group in Bear Eiver Valley. Mr. Meek made 

 it the type of his genus Fyrgidifera, and described and figured it in the 

 U. S. Geol. Sur. 40th Parallel ; and also in U. S. Expl. Great Basin of 

 Utah (Simpson). It is probably a widely-distributed species in the 

 equivalents of the Bear Eiver Laramie. Among some fossils brought 

 by Professor Powell from Upper Kanab, Southern Utah, I have recog- 

 nized this species, together with some which characterize the Laramie 

 Group farther eastward, but I do not know whether they were there as- 

 sociated together in the same layers. 



29. Hydrobia recta White. 



This species has been found only in the upper beds at the coal-mines, 

 three miles from Evanston. It is associated with fresh- water and land 

 shells only, and is probably not a true Sydrobia, but the condition of the 

 specimens does not warrant a conclusive reference to any other genus. 

 It is described in Powell's Eeport on the Geology of the Uinta Moimt- 

 ains, p. 132. 



30. Viviparus couesi White. 



This is the largest species of Viviparus known to me. It has has been 

 foimd only in the lower Laramie beds of the Bear Eiver Valley, but 

 examples of it have been obtained wherever those strata have been exam- 

 ined by me. It is described in the Bulletin U. S. Geol. Sur. Terr. vol. iv, 

 p. 717. Mr. Meek gave two figures of an imperfect example of it in U. 

 S. Geol. Sur. 40th Parallel, vol. iv, pi. 17, fig. 15 and 15rt, under the 

 generic name of Campeloma, but without a specific name. It has the 

 straight outer lip and other characteristics of Vivijjarus, and not the 

 sinuate outer lij) of Campeloma. 



31. Campeloma macrospira INIeek. 



This species is associated with No. 30, and has been found in consider- 

 able numbers wherever the lower beds are exposed in Bear Eiver Valley. 



