638 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



Arca sp. 



A single imperfect specimen, probably of an undescribed species, from 

 the locality near the second crossing of Snake River. 



Nucula sp. 



A cast near month of Glade Creek. 



Cardium pauperculum Meek. 



Gardium pauperculum Meek, 1871 : Ann. Rept. U. S. Geol. Surv. Terr, for 1870, p. 306. 



White, 1879: Idem for 1877, p. 291, PI. IX, fig. 3a. Stanton, 1894: Bull. U. S. 



Geol. Surv. No. 106, p. 99, PI. XXII, figs. 9-12. 

 Gardium subcurtum Meek, 1873: Ann. Rept. U. S. Geol. Surv. Terr, for 1S72, p. 476. 

 1877: U. S. Geol. Expl. 40th Parallel, Vol. IV, Pt. I, p. 152, PI. XV, fig. 3a. 



This is the most abundant species in the sandstones near Glade Creek, 

 near second crossing of Snake River, and on Lizard Creek. 



It is common in the Colorado formation at Coalville, Utah; in south- 

 western Wyoming, and in Huerfano Park, southern Colorado. In these 

 localities it is not known to range as high as the Montana formation. 



Baroda wvomingensis Meek. 



Tapes wyomingensis Meek, 1871 : Ann. Rept. U. S. Geol. Surv. Terr, for 1870, p. 310. 

 Baroda wyomingensis Meek, 1S73: Idem for 1872, p. 493. White, 1879: Idem for 1877, 

 p. 293, PI. X, figs. 3«, b. 



A single specimen from Glade Creek. 



It is possible that this species belongs to Conrad's genus Legumen, 

 described from the Cretaceous of Ripley, Mississippi. I have elsewhere 1 

 expressed the opinion that Baroda is probably a synonym of Legumen, 

 which is a prior name. 



Donax cuneata Stanton. 



DoNAx(?) OBLONGA StailtOll. 



Both these species occur on a single hand specimen from near the 

 second crossing of the Snake River. The type of D. cuneata was collected 

 in sandstone of the Colorado formation at Old Bear River City, southwestern 

 Wyoming, 2 and D. oblonga came from the same horizon at Coalville, Utah. 

 D. cuneata occurs also in the Montana formation of the Coalville section. 



'Bull. U. S. Geol. Surv. No. 106, p. 107. 2 Ideni, p. 110, PI. XXV, fig. 1. 



