TYPE SPECIMENS OF INVERTEBRATE FOSSILS. 559 



15434. Ptychoparia piochensis Walcott. Cotype. 



Middle Cambrian. Near Pioche, Nevada. 



Walcott, Bull. No. 30, U. S. Geol. Surv., 1886, p. 201, pi. 26, figs. 

 2-2b; pi. 28, figs. i-ie. 



15441. Ptychoparia? prospectensis Walcott. Holotype. 



Lower Cambrian. Prospect Peak, Eureka District, 

 Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 46, pi. 9, fig. 20; 

 Bull. No. 30, U. S. Geol. Surv., 1886, p. 202, pi. 27, fig. 5. 



15432. Ptychoparia quadrans (Hall and Whitfield). Cotypes. 



Middle Cambrian. Box Elder Canyon, Wahsatch Moun- 

 tains, Utah. 



Walcott, Bull. No. 30, U. S. Geol. Surv., 1886, p. 199, pi. 29, figs. 

 4-4b. 



See Crepicephalus ? (Doganellus) quadrans. 



24641. Ptychoparia similis Walcott. Cotype. 



Upper Cambrian. Secret Canyon, Eureka District, 

 Nevada. 

 Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 52, pi. io, fig. 10. 



24609. Ptychoparia similis robustus Walcott. Holotype. 



Upper Cambrian. Secret Canyon, Eureka District, 

 Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 53, pi. 1, figs. 9, 9a. 



23860. Ptychoparia suada Walcott. Holotype. 



Upper Cambrian. Morgans Creek, Burnett County, 

 Texas. 

 Walcott, Proc. U. S. Nat. Mus., XIII, 1890, p. 274, pi. 21, fig. 9. 



15442. Ptychoparia subcoronata (Hall and Whitfield). Cotypes. 



Dower Cambrian. Ute Peak, Wahsatch Range, Utah. 



Walcott, Bull. No. 30, U. S. Geol. Surv., 1886, p. 205, pi. 28, fig. 4; 

 Tenth Ann. Rept. U. S. Geol. Surv., 1890, p. 652, pi. 96, fig. 6. 



See Conocephalites subcoronatus. 



15436. Ptychoparia teucer (Billings). Plesiotype. 



Dower Cambrian. Near Highgate Springs, Vermont. 



Walcott, Bull. No. 30, U. S. Geol. Surv., 1886, p. 197, pi. 26, fig. 3; 

 Tenth Ann. Rept. U. S. Geol. Surv., 1890, p. 652, pi. 96, fig. 3. 



23861. Ptychoparia? urania Walcott. Cotypes. 



Upper Cambrian. Packsaddle Mountain, Dlano County, 

 Texas. 

 Walcott, Proc. U. S. Nat. Mus., XIII, 1890, p. 274, pi. 21, figs. 10, 11. 



15437. Ptychoparia vulcanus (Billings). Plesiotype. 



Dower Cambrian. Georgia, Vermont. 



Walcott, Bull. No. 30, U. S. Geol. Surv., 1886, p. 198, pi. 26, fig. 4; 

 Tenth Ann. Rept. U. S. Geol. Surv., 1890, p. 653, pi. 96, fig. 4. 



