518 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



39887. Platycrinus polydactylus Troost. Chirotypes. 



Mississippian. Near Huntsville, Alabama. 



Troost, Proc. Amer. Assoc. Adv. Sci., II, 1S50, p. 62. 



8526. Platycrinus vexabilis White. Holotype. 



Lower Carboniferous. Mountain Spring, Old Mormon 

 Road, Nevada. 



White, Prelim. Rept. U. S. Geogr. Surv. W. 100th Merid., 1874, 

 p. 15; Rept. U. S. Geogr. Surv. W. 100th Merid., IV, Pt. I, 

 1877, p. Si, pi. 5, fig. 2. 



35396. Platycystites faberi Miller. Plastotype. 



Trenton (Ord.). Scott County, Virginia. 



Miller, N. Amer. Geol. and Pal., 1889, p. 272, fig. 398. 



14407. Platyostoma inornatum Walcott. Holotype. 



Lower Carboniferous. Eureka District, Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 255, pi. 24, figs. 

 3- 3a. 



14984. Platyostoma (?) minutissimum Clarke. Cotypes. 



Naples (Dev.). Briggs Gully, Houeoye Lake, New York. 

 Clarke, Bull. No. 16, U. S. Geol. Surv., 1885, p. 55. 



34129. Platyostoma minutum Girty. Holotype. 



Three Forks (Dev.). Soda Butte Creek, Yellowstone 

 National Park. 



Girty, Mon. XXXII, Pt. II, U. S. Geol. Surv., 1899, p. 506, pi. 

 66, figs. 7a, 7b. 



4802. Platyostoma ventricosa Conrad. Plastotype. 



Oriskany (Lower Dev.). Albany County, New York. 

 Hall, Nat. Hist. N. Y., Pal. Ill, 1859, p. 469, pi. 113, figs. 7, 8. 



13946. Platyschisma? ambiguum Walcott. Cotypes. 



Upper Devonian. The Gate, Eureka District, Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 188, pi. 17, figs. 

 3, 3a. 



3626. Platyschisma depressum Dana. Cotypes. 



Carboniferous. Harpers Hill on the Hunter, New South 

 Wales, Australia. 



Dana, Wilkes U. S. Expl. Exped., X, 1S49, p. 707, Atlas, pi. io, 

 figs. 2a, 2b. 



13947. Platyschisma mccoyi Walcott. Cotype. 



Upper Devonian. Newark Mountain, Eureka District, 

 Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 1SS4, p. 1S8, pi. 17, figs. 

 i-ic. 



