306 PROCEEDINGS OF THE ACADEMY OF [1881. 



*1863. Periechoor. Christyi Hall. (Actinoor. Christyi— not Shum., 1855) Trans. 



Albany Inst., iv, p. 196; (Abstr., p. 2); Meek and Worth, 1868, Saocoor. 



Chrystyi, Geol. Rep. 111., iii, p. 347, PI. 5, fig. 1 ; also Hall, 1879,28th Rep. N. 



Y. St. Cab. Vat, Hist. (pd. ii), p. 127, PI. 13, figs. 12-20. Niagara gr. 



Waldron, Ind., near Chicago, III.; and Racine, Wis. 

 ^S"^". Actinocr. Whitfieldi Hall, 1868. 20th Rep. N. York St. Cab. Nat. Hist., 



p. 326; Actinocr. (Saocoor.) Whitfieldi Hall. Ibid. (Revised Ed.), 1870, 



pp. 370 and 430, 

 Syn. Megistoor. Marcouanus (1860) Winchell and Marcy. Mem. Best. Soc. 



Nat. Hist., i, p. 87, PI. 2, fig. 5. S. A. Miller, Journ. Cincin. Soc. Nat. Hist. 



(.July number), considers it a good species. 

 Si/n. Megistocr. infeliz Winch, and Marcy, 1866, Ibid., p. 7. 

 »185S. Periechocr. Gothlandicas Pander. (Trochocrinites Gothlandicus) Helmer- 



son's Geol. Bemerk. auf einer Reise in Schweden und Norwegen, p. 20, PI. 3, 



figs, a, b, d, e (not c); Angelin, 1878, Periechocr. gothlandicus, Iconogr. 



Crin. Suec, p. 7, PI. x, figs. 3, 4. Upper Silur. Gothland, Sweden. 

 This species and P. radiatUS difier from the typical form of the genus. 

 1878. Periechocr. interradiatus Angl. Iconogr. Crin, Suec. Figured without 



description, PI. 19, fig. 15. Upper Silur. Dudley, Eng. 

 *184S. Periechoor. Isevis Portlock. (Trochocrinites laevis) Geol. of Londonderry, 



p. 346, PI. 15, fig. 1. Silurian. Tyrone, Ireland. 

 *18S0. Periechoor. Lindstromi Wachsm. and Spr. (Described by Angelin as 



Actinocr. interradiatus = Periechocr. interradiatus — not the previous 



species from Dudley). Iconogr, Crin, Suec, p. 6, PI, 26, fig. 15. Upper 



Silur. Gothland, Sweden. 

 This species was named in honor of Prof. Lindstrom of Stockholm. 

 *187S. Periechocr. longidigitatus Angel. (Actinocr. longidigitatus) Iconogr. Crin. 



Suec, p. 6, PI. 26,figs. 19, 19 a. Upper Silur. Gothland,Sweden. 

 *I878. Perieohoor. longimanus Angel. (Actinocr. longimanus). Iconogr. Crin. 



Suec, p. 6, PI. 15, fig. 17 and PI. 26, fig, 16; PI..28, figs. 5 and 6. Upper 



Silur, Gothland, Sweden. 

 *1878. Perieohoor. minor Wachsm, and Spr, (Desc, by Angel, as P. Isevis, not 



P. laevis Portlock's sp.) Iconogr. Crin. Suec, p. 7, PI, 18, fig, 11, Upper 



vSilur, Gothland, Sweden, 

 1821. Periechoor, moniliformis Miller, (Actinoor. moniliformis). Type of the genus, 



Nat. Hist. Crinoidea, p. 116; Phillips, 1839, Murchison's Silur. Syst., p, 



673, PI, 18, fig, 4; d'Orhigny, 1850, Geocr. moniliformis Prodr., i, p. 46; 



Angel,, 1878, Iconogr, Crin, Suec, PI. 19, figs. 14, a, b, c Upper Silur, 



Dudley, Eng. 

 Syn. Periechocr. oostatus Austin, 1843. Ann. and Mag. Nat, Hist,, xi, 



p. 204. 

 *1878. Perieohoor. nubilus Angelin. (Actinocr. nubilus). Iconogr. Crin. Suec, p. 



6, PI. 18, fig. 14. Upper Silur. Gothland, Sweden. 

 *1875. Periechocr. ornatus Hall. (Saccocr. ornatus). Geol. Rep. Ohio Paleont., 



ii, p. 126, PI. 6, figs. 7, 9. Niagara gr. Yellow Springs, 0. 

 *1854. (?) Periechocr. pulcher (Salter MS.) McCoy. (Actinocr. pulcher). Synop. 



Brit. Pal. Foss., p, 55, PI. 1 d, fig, 3, Upper Silur, Wales, 

 (This species is not well known, and may possibly belong to a separate group 



with P. radiatus, P. gothlandicus, or may be a Glyptoorinus.) 

 *1878. Periechocr. quinquangularis Angel. (Actinocr. quinquangularis). Iconogr. 

 Crin. Suec, p. 6, Pi. 16, figs. 27, 27 a, 28. Upper Silur. Gothland, Sweden. 



