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. 



:55283. Acrotreta parvula Walleriiis. Ple.siotype. 



Middle Cambrian. Borgholm, Oland, Sweden. 



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



15343. Acrotreta primaaea Walcott. Cot5'^pes. 



lyower Cambrian. Pioche, Nevada. 



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

 See Acrotreta gemma. 



8570. Acrotreta pyxidicula White. Cotypes. 



Upper Cambrian. Schellbourne, vSchell Creek Range, 

 Nevada. 



White, Prelirn. Rept. U. vS. Geogr. Surv. W. lootli Merid., 8 vo., 

 1874, p. 9; Rept. U. vS. Geogr. Surv. W. lootli Merid., IV, 

 Pt. I^ 1877 ,p. 53, pi. 3, figs. 3a-3d. 



35284. Acrotreta sagittalis magna Matthew. Plesiotypes. 



Middle Camln'ian. Hastings Cove, Kennebecasis River, 

 St. John Comity, New Brnnswick. 



Walcott, Proc. I^. vS. Nat. Mus., XXV, 1902, p. 595. 



35285. Acrotreta signalis Walcott. Cotyi)es. 



Middle CamlM'ian. St. Croix Falls, Wisconsin. 



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



35286. Acrotreta socialis v. vSeebach. Ple.siotypes. 



Middle Cambrian. Oland, Island of Borgholm, Sweden. 



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



8575. Acrotreta? subsidua White. Cotypes. 



15345. Middle and Lower Cambrian. Antelope vSpring, House 



15346. Range, Utah. 



White, Prelim. Rejit., U. S. Geogr. vSurv. W. looth Merid., 8 vo., 

 1874, ]). 6; Rejtt. U. vS Geogr. vSurv. W. looth Merid., IV, 

 Pt. I, 1S77, p. 34, ])1. I, figs. 3-3d. — Walcott, Bull. No. 30, 

 IT. S. (icoi. Surv., 18S6, p. 108, pi. 9, figs. 4-4C; Tenth Ann. 

 Rept. V. vS. Geol. vSurv., 1890, p. 608, pi. 70, figs. i-ic. 



= Acrothele stib.sidua. 



285. Actseon ( Solidula) attenuata Meek and Hayden. Holotyj^e. 

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

 Montana. 

 Meek and Ilayden, Proc. Acad. Nat. vSci. Phila., 185S, p. 54. 

 = Actaion atteniiatiis. 



