TYPE SPECIMENS OF INVERTEBRATE FOSSILS. 23 



15343. Acrotreta gemma Billings. Plesiotypes. 



Dower Cambrian. Pioche, Nevada. 



Walcott, Bull. No. 30, U. S. Geol. Surv., 1886, p. 98, pi. 8, figs, 

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

 67, figs. 5-5C 



—- Acrotreta primasea. 



24549. Acrotreta gemma Billings. Plesiotypes. 



Upper Cambrian. Eureka District, Nevada. 



Walcott, Mon., VIII, U. S. Geol. Surv., 1884, p. 17, pi. 1, figs, 

 ia, ib, id-if; pi. 9, figs. 9, 9a. 



See Acrotreta attenuata. 



35216. Acrotreta gemma Billings. Plesiotypes. 



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

 tin Range, Yellowstone National Park. 



Walcott, Mon. XXXII, Pt. II, U. S. Geol. Surv., 1899, p. 449, 

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



35272. Acrotreta gracia Walcott. Cotypes. 



Middle Cambrian. Hastings Cove, Kennebecasis River, 

 St. John County, New Brunswick. 

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



35273. Acrotreta idahoensis alta Walcott. .Cotypes. 



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



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 Brunswick. 

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



35277. Acrotreta kutorgai Walcott. Cotypes. 



Middle Cambrian. Coosa Valley, near Gadsden and Che- 

 pultepec, Alabama. 



Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 5S9. 



35278. Acrotreta microscopica missouriensis Walcott. Cotypes. 



35279. Middle Cambrian. St. Francois County, and near Potosi, 



Missouri. 



Walcott, Proc. U. 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. Mus., XXV, 1902, p. 590. 



