24 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



35281. Acrotreta ophirensis Walcott. Cotypes. 



Middle Cambrian. Ophir City, Utah. 



Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 591. 



35282. Acrotreta ophirensis rugosus Walcott. Cotypes. 



Middle Cambrian. Ophir City, Utah. 



Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 592. 



35283. Acrotreta parvula Wallerius. Plesiotype. 



Middle Cambrian. Borgholm, Oland, Sweden. 

 Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 592. 



15343. Acrotreta primaaea Walcott. Cotj^pes. 



Lower Cambrian. Pioche, Nevada. 



Walcott, Proc. U. S. Nat. Mus.. XXV, 1902, p. 593. 

 See Acrotreta gemma. 



8570. Acrotreta pyxidicula White. Cotypes. 



Upper Cambrian. Schellbourne, Schell Creek Range, 

 Nevada. 



White, Prelim. Rept. U. S. Geogr. Surv. W. 100th Merid., 8 vo., 

 1874, p. 9; Rept. U. S. Geogr. Surv. W. 100th Merid., IV, 

 Pt. I, 1S77 ,p. 53, pi. 3, figs. 3a-3d. 



35284. Acrotreta sagittalis magna Matthew. Plesiotypes. 



Middle Cambrian. Hastings Cove, Kennebecasis River, 

 St. John County, New Brunswick. 

 Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 595. 



35285. Acrotreta signalis Walcott. Cotypes. 



Middle Cambrian. St. Croix Falls, Wisconsin. 

 Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 599. 



35286. Acrotreta socialis v. Seebach. Plesiotypes. 



Middle Cambrian. Oland, Island of Borgholm, Sweden. 



Walcott, Proc. U. S. Nat. Mus. XXV, 1902, p. 599. 



8575. Acrotreta? subsidua White. Cotypes. 



*5345- Middle and Lower Cambrian. Antelope Spring, House 



15346. Range, Utah. 



White, Prelim. Rept., U. S. Geogr. Surv. W. 100th Merid., 8 vo., 

 1874, p. 6; Rept. U. S Geogr. Surv. W. 100th Merid., IV, 

 Pt. I, 1S77, p. 34, pi. 1, figs. 3~3d. — Walcott, Bull. No. 36, 

 U. S. Geol. Surv., 1886, p. 108, pi. 9, figs. 4-4C; Tenth Ann. 

 Rept. U. S. Geol. Surv., 1890, p. 60S, pi. 70, figs. i-ic. 



= Acrothele subsidua. 



285. Actaeon | Solidula ) attenuata Meek and Hayden. Holotype. 

 Montana (Cret). Yellowstone River, near Miles City, 

 Montana. 

 Meek and Hayden, Proc. Acad. Nat. Sci. Phila., 1858, p. 54. 

 = Actaeon attenuatus. 



