618 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



place. A few specimens were obtained on divide between Fawn Creek 



and Gallatin Valley; saddle in ridge west of south head of Gardiner; hills 



west of Snake River 4 miles south of second crossing ; top of hill 3 miles 



southeast of Gravel Peak; ridge between Basin and Red creeks, and slopes 



of Mount Sheridan. 



Pinna kingi Meek. 



Pinna kingi Meek, 1877 : U. S. Geol. Expl. 40tk Parallel, Vol. IV, Pt. I, p. 131 , PI. 

 XII, figs. 9, 9«. 



A few fragments of this species were obtained in ridge west of south 

 head of Gardiner, and on north side of old road between Terrace Mountain 

 and Sentinel Butte. The species was described from Weber Canyon, Utah. 



Cucull.ea haguei Meek. 



PI. LXNIII, fig. 1. 



Cucullcea haguei Meek, 1S77: IT. S. Geol. Expl. 40th Parallel, Vol. IV, Pt. I, p. 134, 

 PI. XII, figs. 1«, b. 



The type of the species came from Weber Canyon, Wasatch Range, 

 Utah. In Meek's figure the radiating stria? of the body of the shell are 

 somewhat exaggerated and the concentric lines are not given cpiite as much 

 prominence as they usually have. On most of the Yellowstone National 

 Park specimens the radiating lines are prominent and widely separated on 

 the anterior third, and are numerous on the umbones, but all excepting the 

 anterior ones usually fade out before reaching the middle of the shell. The 

 fine, regular, closely arranged concentric lines cover the whole valve. 



Some of the casts show the horizontal teeth at both ends of the hinge 

 line characteristic of Cucullaea, but there are no traces of the ridge bor- 

 dering the posterior muscular impression that is seen in typical species of 

 that genus. 



The specimen figured is from a locality near Sentinel Butte. The 

 species is also represented in the collection from north side of Fan Creek 

 Pass; saddle in ridge west of south head of Gardiner River; summit of 

 wagon road between Sentinel Butte and Terrace Mountain; Cinnabar 

 Mountain, and west side of Snake River north of Berry Creek. 



Trigonia amekicana Meek. 



Trigonia americana Meek, 1873: Ann. Kept. U. S. Geol. Surv. Terr, for 1872, p. 472. 

 White, 1880: Idem for 1878, p. 148, PI. XXXVIII. fig. la, 6. 



A single specimen from ridge northwest of second crossing of Snake 



