TYl'E SPECIMENS OF INVERTEBRATE FOSSILS. 23 



15343. Acrotreta gemma Billings. Plesiotypcs. 



lyower Cambrian. Pioche, Nevada. 



Walcott, Bull. No. 30, U. vS. Geol. Surv., 18S6, p. 98, pi. 8, figs, 

 i-ib; Tenth Ann. Rept. U. S. Geol. Surv., 1890, p. 608, pi. 

 67, figs. 5-56. 



=^ Acrotreta primasea. 



24549. Acrotreta gemma Billings. Plesiotypes. 



Upper Cambrian. luireka Di.strict, Nevada. 



Walcott, Mon., VIII, U. vS. Geol. Surv., 1884, p. 17, pi. i, figs, 

 la, lb, id-if; pi. 9, figs. 9, 9a. 



See Acrotreta attenuata. 



35216. Acrotreta gemma P)illin.2;s. Plesiotypes. 



Flathead and Oallatin (Mid. and Up. Cambrian). Galla- 

 tin Range, Yellowstone National Park. 



Walcott, Mon. XXXII, Pt. II, U. S. Geol. Surv., 1S99, p. 449, 

 pi. 62, figs. 2, 2a-e. 



35272. Acrotreta gracia Walcott. Cotypes. 



Middle Cambrian. Hastings Cove, Kennebecasis River, 

 vSt. John County, New Brunswick. 

 Walcott, Proc. U. S. Nat. IMus., XXV, 1902, p. 586. 



35273. Acrotreta idahoensis alta Walcott. Cotypes. 



35274. Middle Cambrian. Secret and New York canyons, Kureka 



District, Nevada. 



Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 588. 



35275. Acrotreta idahoensis sulcata Walcott. Cotypes. 



Middle Cambrian. Near Paris, Idaho. 



Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 588. 



35276. Acrotreta inflata Matthew. Plesiotypes. 



Middle Cambrian. Hanford Brook, New Brun.swick. 

 Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 58S. 



35277. Acrotreta kutorgai Walcott. Cotypes. 



Middle Cambrian. Coosa \'alley, near Gadsden and Che- 

 pnltepec, Alabama. 



Walcott, Proc. V. S. Nat. Mus., XXV, 1902, p. 589. 



35278. Acrotreta microscopica missouriensis Walcott. Cotypes. 



35279. Middle Cambrian. St. Francois County, and near Poto.si, 



Missouri. 



Walcott, Proc. I'. S. Nat. ]Mus., XXV, 1902, p. 590. 



35280. Acrotreta microscopica tetonensis Walcott. Cotypes. 



Middle Cambrian. Divide at head of Sheep Creek, Teton 

 Range, Wyoming. 



Walcott, Proc. U. S. Nat. ^lus., XXV, 1902, p. 590. 



