22 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



24595. Acrothele? dichotoma Walcott. Holotype. 



Upper Cambrian. Secret Canyon, Eureka District, Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 14, pi. 9, fig. 11. 



15344. Acrothele subsidua (White). Plesiotypes. 



15345. Middle Cambrian. Antelope Springs, Utah, and Pioche, 



15346. Nevada. 



Walcott, Bull. No. 30, U. S. Geol. Surv., 1886, p. 108, pi. 9, figs. 

 4-4C; Tenth Ann. Rept. U. S. Geol. Surv., 1890, p. 608, pi. 70, 

 figs. i-ic. 



See Acrotreta? subsidua. 



35265. Acrotreta argenta Walcott. Cotypes. 



Upper Cambrian. Near Benders Pass, Silver Peak Range, 

 Nevada. 

 Walcott, Proc U. S. Nat. Mus., XXV, 1902, p. 580. 



7867. Acrotreta attenuata Meek. Cotypes. 



Middle Cambrian. Above Gallatin City, east side of Gal- 

 latin River, Montana. 



Meek, Sixth Ann. Rept. U. S. Geol. Surv. Terr., 1S73, p. 463, in 

 a footnote. 



[Listed as Acrotreta subconica Kutorga, but changed to A. attenu- 

 ata Meek in a footnote.] 



= Acrotreta gemma. 



35266. Acrotreta concentrica Walcott. Cotypes. 



Middle Cambrian. Between Dalton and Lafayette, Georgia. 



Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 583. 



35267. Acrotreta conula Walcott. Cotypes. 



Upper Cambrian. Oland, Sweden. 



Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 584. 



35268. Acrotreta convexa Walcott. Cotypes. 



Upper Cambrian. Gillis Hill, Salmon River, near Marion 

 Bridge, Cape Breton, Nova Scotia. 



Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 584. 



35269. Acrotreta curvata Walcott. Cotypes. 



Upper Cambrian passage beds. Hamburgh Ridge, 

 Eureka District, Nevada. 

 Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 584. 



35270. Acrotreta definita Walcott. Cotypes. 



35271. Middle Cambrian and summit of Prospect Mountain lime- 



stone. Montpelier, Idaho; Prospect Mountain, Eureka 

 District, Nevada. 

 Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 584. 



