518 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



39887. Platycrinus polydactylus Troost. Chirotypes. 



Mississippiaii. Near Huntsville, Alabama. 



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



8526. Platycrinus vexabilis White. Holotype. 



lyower Carboniferous. Mountain Spring, Old Mormon 

 Road, Nevada. 



White, Prelim. Rept. U. S. Geogr. Surv. W. looth Merid., 1S74, 

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

 1877, p. 81, 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. Holotj'pe. 



lyOwer 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, Honeoye 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 ( L,ower 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, 1849, p. 707, Atlas, pi. 10, 

 figs. 2a, 2b. 



13947. Platyschisma mccoyi Walcott. Cotj^pe. 



Upper Devonian. Newark Mountain, Eureka District, 

 Nevada. 



Walcott, Mon. VIII, U. S. (ieol. vSurv., 1884, p. 1S8, pi. 17, figs, 

 i-ic. 



