BATOCRINID^. 5^9 



Horizon and Localihj. — Upper part of Hudson River group ; Wajnes- 

 viUe, 0. 



Type in the collection of I. H. Harris, Esq., 'Waynesvine. 



B. PERIECHOCRINITES. 



PERIECHOCRINUS Austin. 



1842. Austin ; Ann. & Mag. Nat. Hist., Vol. X., p. 109 (uo definition). 



1843. Austin ; ibid., Vol. XL, p. 203. 



1843. MoKEis ; Catal. Brit. Foss. (Ed. 1), p. 56 (Ed. 2, p. 86). 



1855. McGot; Sjnops. Brit. Palasoz. Foss., p. 56. 



1857. PiCTET ; Traite de Paleont., Vol. IV., p. 323. 



1859. MuRCHisoN ; Siluria, p. 536. 



1862. DujAKDiN and Hupe; Hist. Natur. des Zooph. Echin., p. 137. 



1878. Angelin; loonogr. Crin. Suec, p. 6. 



1879. ZiTTEL ; Haudb. der PaliEoat., Vol. I., p. 369. 



1881. W. and Sp. ; Revision Pateocr., Part II., p. 127 (Proceed. Acad. Nat. Sci. PMla.,p. 301). 

 Syu. AcUmcrinUes — J. S. Millek; 1S21, Historj of tlie Crinoidea, p. 116. 

 Syn. ^c^/noCT-M^M — Phillips ; 1839, Murcb. Silur. Syst., p. 673, Plate IS, Fi". 4. 

 Syn. Trochocrinites — Portlock; 1848, Geol. of Londonderry, p. 345. 



Syn. i^)Pradomniis — Di, Verneuil; 1850, BuU. Soc. Geol. France (ser. XL), Vol. VIL, p. 184. 

 Syn. ff«ocW««s — D'Okbignt; 1850, Prodr. de Paleont., Vol. L, p, 46. 

 Syn. Saccocrinus — Tkoost; 1850; List of Crin. Tenn. (no description). 

 Syu. Saccocrinus — "a.\-L-L\ 1852, Palfeont. N. York, Vol. II., p. 205. 

 Syn. Py.nV&(;«MS — MiJ-LLEE ; (in part.) ; 1857, Neue Ecbin. Eifl. Kalk., p. 253, 

 Syn. (?)2'/-o<^/wc«/HVfi — Pander, 1858, Helmerson's Geol. Bemerk. auf einer Reise in Sweden eic 

 p. 20. ' ■' 



Syn. Saccocrimis — 'F. Roeiier; 1860, Silur. Fauna West Tenn., pp. 42-44. 

 Syn. Actinocrims {ileijistocrims) Hall ; 1861, Bost. Journ. Nat. Hist., p. 271. 

 Syn. Actinocrhms {Pradocrums) — ^. and W. ; 1861, Proceed. Acad. Nat. Sci. PLila., p. 133. 

 Syn. Acfinocrimis — Hall, 1863, Trans. Alb. Inst., Vol. V., p. 196. 



Syn. Megistocrimis—l^mc^. and SlAKcr; 1865; (not 0. and Sh.), Mem. Bost Soc Nat Hist I 

 p. 87. ■' ■' 



Syn. Actimcrhms {Saccocrimis) — li. and W. ; 1S69, Geol. Rep. Illinois, Vol. III., pp. 347 and 470. 

 Syn. Meghtocriuus {Saccocmius) M. and W. ; 1873, Geol. Rep. lUinois, Vol. V., p. 397. 

 Syn. &«™c«-«p« — Hall; 1879, 28th Rep. N. Y. State Mus. Nat. Hist. (Revise'd Ed.), p. 127. 

 Syn. Saccocrinus — S. A. Miller — Journ. Cinciii, Soc. Nat. Hist, of 1881 and 1882. ' 



Calyx large, elongate, bell- or urn-shaped. Plates thin, and their surfaces 

 smooth or delicately sculptured ; the radial plates generally having a ridge 

 passing from plate to plate, which increases in prominence upwards until it 

 becomes identified with the free arms. 



Basals three, equal, forming a deep cup ; column facet wide. Radials 

 and costals long and narrow ; constricted at their upper and lower faces, 

 sometimes connected merely by the point of an angle. Costals two, hex- 

 angular and heptangular. Distichals in two to four rows; supporting from 

 two to six palmars, except in a few eases where the arms are free above the 



