TYPE SPECIMENS OF INVERTEBRATE FOSSILS. 445 



27310. Obolus (Lingulella) chuarensis Walcott. Cotypes. 



Middle Cambrian. Head of Nunkoweap and Chuar Val- 

 leys, Grand Canyon, Arizona. 

 Walcott, Proc. U. S. Nat. Mus., XXI, 1898, p. 399. 



35294. Obolus (Lingulella) collicia Matthew. Plesiotypes. 



Middle Cambrian. Dougal Brook, Branch of Indian 

 River, Cape Breton, Nova Scotia. 



Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 610. 



35239. Obolus (Lingulella) davisi McCoy. Plesiotype. 



Lingula Flags (Upper Cambrian). Port Madoc, North 

 Wales. 



Walcott, Proc. U. S. Nat. Mus., XXI, 1898, pp. 391-4, 420, pi. 27, 

 figs. 1-5. 



2731 1 Obolus (Lingulella) desideratus Walcott. Cotypes. 



to Upper Cambrian arid Lower Ordovician. Crowfoot Sec- 



27313. tion, Gallatin Range, Wyoming; Hamburg Mine, 

 Eureka District, Nevada. 



Walcott, Proc. U. S. Nat. Mus., XXI, 1898, p. 399. 



35207. Obolus (Lingulella) desideratus Walcott. Cotypes. 



Gallatin (Upper Cambrian). Crowfoot section, Gallatin 

 Range, Yellowstone National Park. 



Walcott, Mon. XXXII, Pt. II, U. S. Geol. Surv., 1899, p. 445, 

 pi. 60, figs. 2, 2a. 



27314. Obolus (Lingulella) dubius Walcott. Cotypes. 



Middle Cambrian. Chisholm Mine, Ely Mountains, near 

 Pioche, Nevada. 

 Walcott, Proc. U. S. Nat. Mus., XXI, 1898, p. 401. 



35242. Obolus (Lingulella) ella Hall and Whitfield. Plesiotypes. 



35243. Middle Cambrian. East Canyon, Oquirrh Mountains, 



35244. Utah, near Pioche, Nevada, and near Helena, Mon- 

 tana. 



Walcott, Proc. U. S. Nat. Mus., XXI, 1898, pp. 390, 420, pi. 28, 

 figs. 5-8. 



2 73 I 5- Obolus fLingulella) ellsi Walcott. Cotypes. 



Upper Cambrian. Chaudiere River, Quebec, Canada. 

 Walcott, Proc. U. S. Nat. Mus., XXI, 1898, p. 402. 



27316. Obolus (Lingulella) euglyphus Walcott. Cotypes. 



Middle Cambrian. Head of Lava and Nunkoweap Valleys, 

 Grand Canyon, Arizona. 



Walcott, Proc. U. S. Nat. Mus., XXI, 1898, p. 402. 



35296. Obolus (Westonia) finlandensis Walcott. Cotypes. 



Middle Cambrian. Aland Saltvik, Finland. 

 Walcott, Proc. U. S. Nat. Mus., XXV, 1902, p. 611. 



