962 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Petraster(?) antiqua Shumard. See Palseaster antiquus. 

 Petraster bellulus Billings. See Mesopalseaster bellulus. 

 Petraster jamesi Schuchert. See Petraster americanus. 



Petraster rigidus (Billings). 



Palseasterina rigidus Billings, Geol. Surv. Canada, Rep. Progr. for 1853-1856, 1857, 

 p. 291. 



Petraster rigidus Billings, Geol. Surv. Canada, dec. 3, 1858, p. 80, pi. 10, fig. 3a.— 

 Wright, Mon. British Foss. Echinod., Oolitic, 2, pt. 1, 1862 (Pal. Soc. for 1861), 

 p. 29.— Hall, 20th Rep. New York State Cab. Nat. Hist., 1868, p. 294; rev. 

 ed., 1870, p. 337.— James, Jour. Cincinnati Soc. Nat. Hist., 18, 1895, p. 134.— 

 Springer, Geol. Surv. Canada, Mem., 15P, 1911, p. 46 (loc. occ). — Schuchert, 

 in Freeh, Foss. Cat., 1, Anim., 1914, p. 32; Bull. U. S. Nat. Mus., 88, 1915, 

 p. 141, pi. 27, fig. 5. 



Trenton (Curdsville) : Ottawa and Kirkfield, Ontario. 



Petraster rigidus Billings (part). See Hudsonaster matutinus. 



Petraster speciosus (Miller and Dyer). 



Palseasterina speciosa Miller and Dyer, Jour. Cincinnati Soc. Nat. Hist., 1, 1878, 



p. 30, pi. 1, fig. 7.— Miller, N. A. Geol. Pal., 1889, p. 266, fig. 381.— Cumings, 



32d Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1908, p. 731, pi. 3, fig. 8. 

 Petraster speciosus Schuchert in Freeh, Foss. Cat., 1, Anim., pt. 3, 1914, p. 33; 



Bull. IT. S. Nat. Mus., 88, 1915, p. 142, pi. 23, fig. 5-7; pi. 26, fig. 1; pi. 27, 



figs. 1-4. 

 Palaeasterina approximata Miller and Dyer, Jour. Cincinnati Soc. Nat. Hist., 1, 



1878, p. 30, pi. 1, fig. 8. 

 Richmond: Near Winchester, Ohio, and Richmond, Indiana. 



Petraster wilberanus Meek and Worthen. See Mesopalseaster wilberanus. 



PETROCRANIA Raymond. Genotype: Craniella meduanensis (Ehlert. 



Craniella (Ehlert (not Schmidt, 1870), Bull. Soc. Etudes Scientif. d'Angers, 1888, 

 p. 37.— Hall and Clarke, Pal. New York, 7, pt. 1, 1892, pp. 153, 170.— Miller, 

 N. A. Geol. Pal., 1st App., 1892, p. 687.— Winchell and Schuchert, Geol. 

 Minnesota, 3, 1893, p. 374.— Hall and Clarke, 11th Ann. Rep. New York State 

 Geol., 1894, p. 262.— Huene, Verh. d. Russ.-Kais. Mineral. Ges. zu St. 

 Petersb., 2d ser., 36, 1899, pp. 297, 315; Neues Jahrb. Min. Geol. Pal., 1, 1899, 

 p. 147.— Grabau, Bull. Buffalo Soc. Nat. Sci., 6, 1899, p. 186.— Schuchert, 

 Zittel-Eastman Textb. Pal., 1, 1900, p. 311. 



Petrocrania Raymond, Ann. Carnegie Mus., 7, 1911, p. 229— Sclmchert, Zittel- 

 Eastman Textb. Pal., 1913, p. 378. 



Petrocrania? clintonensis (Foerste). 



Craniella? clintonensis Foerste, Geol. Ohio, 7, 1895, p. 565, pi. 37, figs. 3a, 3b. 

 Upper Medinan (Brassfield) : Todds Fork, Ohio. 



Petrocrania prona Raymond. ' 



Crania prona Raymond, Ann Carnegie Mus., 3, 1906, p. 594; 7, 1911, p. 229, 



pi. 34, figs. 26-31. 

 Chazyan: Valcour Island and Chazy (Valcour), New York. 

 Petrocrania ulrichi (Hall and Clarke). 



Craniella ulrichi Hall and Clarke, Pal. New York, 8, pt. 1, 1892, pp. 153, 181, pi. 



4, figs. 1, 2; 48th Rep. New York State Mus., 2, for 1895, 1S97, p. 336, pi. 3, 



figs. 15, 16; 14th Rep. State Geol. New York for 1894, 1897, p. 336, pi. 3, figs. 



15, 16.— Winchell and Schuchert, Geol. Minnesota, 3, 1893, p. 375, pi. 29, 



figs. 38, 39. 



