1879.] NATURAL SCIENCES OF PHILADELPHIA. 335 



*1869. Poteriocr. notabilis Meek and Worthen. (Scaphiocr. notabilis.) Pro- 

 posed type of the genus. Proc. Acad. Nat. Sci. Phila., p. 148. Geol. Rep. 

 111., vol. v. p. 410, pi. 1, fig. 9. Lower Burl, liuiest. Subcarb. Burlington, 

 Iowa. 



1862. Poteriocr. obuncus White. Proc. Bost. Soc. Nat. Hist., p. 11. Lower Burl. 

 limest. Subcarb. Burliagton, Iowa. 



1842. Poteriocr. plicatus Austin. Ann. and Mag. Nat. Hist. (ser. 1), vol. x. p. 

 108; Id., vol. xi. p. 196. Mon. Rec. and Foss. Crin., p. 79, pi. 9, figs. 4 

 a-f ; DeKoninck and Lehon, Recherch. Crin. Belg., p. 100, pi. 1, fig. 11. 

 Subcarb. Bristol, England, and Tournay, Belgium. 



1854. Poteriocr. spissus DeKon. and Lehon. Recherd. s. les Crin. Belg., p. 100, 

 pi. i. figs. 9 a, b. Subcarb. Avon, England. 



1866. Poteriocr. stellaris Schultze. Mon. Echinod. Eifl. Kalk., p. 49, pi. 5, fig. 2. 



Devonian. Eifel, Germany. 

 *1861. Poteriocr. Whitei Hall. (Scaphiocr. Wbitei.) Desc. New. Pal. Crin., p. 

 7, Bost. Journ. Nat. Hist., p. 306. Lower Burl, limest. Subcarb. Bur- 

 lington, Iowa. 



B. SCAPHIOCRINUS Hall (modified by W. & Spr.). 



1858. ScapMocrinus Hall (subgenus of Poteriocr.). Geol. Rep. Iowa, vol. 

 i. pi. ii. p. 550. 



1867. Hydriocrinus Traatschold, Bull. de. Moscou, p. 16. 



Calyx obconical to semiovoid. Radials truncate above ; bra- 

 chials simple or compound, and similar in form to the radials, but 

 truncate below; line of articulation straight, occupying the full 

 width of the plate ; sutures gaping. Column round, obscurely 

 pentagonal, or even pentalobate. 



a. Species with a Simple Brachial. 



*1859. Pot. (ScapMocrinus) aequalis Hall (not Scaphiocr. aequalis Hall, 1861, 

 Bost. Journ. Nat. Hist., p. 316 = Pot. (Pack //locri)U(s) irregularis, W. & 

 Spr.). Supp. Geol. Rep. Iowa, p. 63. Lower Burl, limest. Subcarb. Bur- 

 lington, Iowa. 

 Syn. Scaphiocr. solidus M. & W. 1861. Proc. Acad. Nat. Sci. Phila., p. 60. 

 Syn. Scaphiocr. tenuidactylus M. & W. 1865. Proc. Acad. Nat. Sci. Phila., 

 p. 156. Geol. Rep. III., vol. iii. pi. 18, fig. 10. 



#1864. Pot. (Scaphiocr.) corycea Hall. (Pot. corycea) 17th Rep. N. Y. St. Cab., 

 p. 57. Geol. Sur. Ohio, Pa*., vol. ii. p. 173, pi. 12, fig. 9. Waverly Gr. 

 Subcarb. Richfield, Ohio. 



1869. Pot. iScaphiocr.) coreyi Meek & Worthen (not Pot. coreyi, Worthen. Geol. 

 Rep. III., vol. vi. p. 514 = Pot. Scytaloerinus grandis, W. & Sp.). Proc. 

 Acad. Nat. Sci. Phila., p. 148. Geol. Rep. 111., vol. v. pi. 15, fig. 1. Keo- 

 kuk limest. Subcarb. Crawfordsville, Ind. 



1864. Pot. (Scaphiocr.) crineus Hall. 17th Rep. N. Y. St. Cab., p. 56. Geol. 

 Surv. Ohio, Pal., vol. ii. p. 172 pi. 12, figs. 6, 7. Waverly Gr. Subcarb. 

 Richfield, Ohio. 



1858. Pot. (Scaphiocr.) dactyliformis Hall. Geol. Rep. Iowa, vol. i. pt. ii. p. 670, 

 pi. 17, fig. 6. St. Louis limest. Subcarb. St. Louis, Mo. 



