1881.] NATURAL SCIENCES OF PHILADELPHIA. 393 



*I836. Ollacrinus bursa Phill. (Gilbertsocr. bursa) Geol. Yorkshire, p. 207, PI. 



4, figs. 24, 25; Austin, 1842, Rhodocr. bursa, Ann. and Mag. Nat. Hist., 



p. 109: also d'Orbigny, Gilbertsocr. bursa, Prodr. de Paleont., i, p. 165. 



Mount, limest, England. 

 «1836. Ollacr. calcaratus Phill. (Gilbertsocr. calcaratus) Geol. Yorkshire p. 207, 



PI. 4, fig. 22 ; d'Orbigny, 1850, Prodr. de Paleont., i, p. 155 ; Austin, 1842, 



Shodocr. calcaratus, Ann. and Mag. Nat. Hist., p. 109. Mount, limest. 



England. (Cumberland's original figure in the Reliquiae Conservata, 1826, 



represents this species.) 

 *1860. Ollacr. fiscellus Meek and Worth. (Trematocr. fiscellus) Proc. Acad. 



Nat. Sci. Phila., p. 383 ; also 1865, Gilbertsocr. (Goniasteroidocr.) fiscellus, 



Ibid., p. 167; also 1866, Gilbertsocr. fiscellus, Geol. Rep. III., ii, p. 222, PI. 



15, fig. 5. Lower Burlington limest. Burlington, Iowa. 

 *1836. Ollacr. mammilaris Phill. (Gilbertsocr. mammilaris) Geol. Yorkshire, 



p. 207, PI. 4, fig. 23; also d'Orbigny, 1850, Prodr. de Paleont., i, p. 155; 



Austin, 1842, Bhodocr. mammilaris, Ann. and Mag. Nat. Hist., p. 109. 



Mount, limest. England. 

 1869. Ollacr. obovatus Meek and Worth. (Goniasteroidocr. obovatus) Proc. 



Acad. Nat. Sci. Phila., p. 76 ; Geol. Rep. 111., v, p. 391, PI. 4, fig. 6 ; 



Wachsm. and Spr., 1878, Ollacr. obovatus, Proc. Acad. Nat. Sci. Phila., 



p. 263. Uppermost part of Upper Burlington limest. Burlington, Iowa. 

 »1860. Ollacr. reticulatus Hall. (Trematocr. reticulatus) Desc. New Sp. Grin., 



p. 9; also Bost. Journ. Nat. Hist., p. 325. Lower Burlington limest. 



Burlington, Iowa. 

 *1860. Ollacr. robustus Hall. (Trematocr, robustus) Supp. Geol. Rep. Iowa., 



p. 77. Lower part of Keokuk limest. Nauvoo, 111., and Keokuk, Iowa. 

 1843. (?) 0. simplex Portloek. (Gilbertsocr. simplex) Geol. Londonderry, p. 350, 



PI. 16, figs. 3 and 13. Fermanaugh, Ireland. Mount, limestone. (This 



species may possibly belong to Bhodocrinus, variety Acantbocrinus ; the 



upper portions of the body are not known.) 

 «i862. Ollacr. spinigerus Hall. (Trematocr. spinigerus) 15th Rep. N. Y. St. 



Cab. Nat. Hist., p. 128. Hamilton gr, Devonian. Ontario Co., N. Y. 

 *1869. Ollacr. tenuiradiatus Meek and Worth. (Goniasteroidocr. tenuiradiatus ) 



Proc. Acad. Nat. Sci. Phila., p. 75; Geol. Rep. 111., v, p. 389, PI. 11, fig. 1. 



Lower Burl, limest. Burlington, Iowa. 

 1860. Ollacr. tuberculosus Hall. (Trematocr. tuberculosus) Supp. Geol. Rep. 



Iowa, p. 75; Wachsm. and Spr., 1878. Ollacr. tuberculosus Proc. Acad. 



Nat. Sci. Phila., p. 263. Upper Burlington limest. Burlington, Iowa. 

 Si/n Trematocr. papillatus Hall, 1860. Supp. Geol. Rep. Iowa, p. 78. 



Synon. (Wachsm. and Spr., 1878). 

 "1859. Ollacr. tuberosus Lyon and Cass. (Goniasteroidocr. tuberosus, and type 



of that genus). Amer. Journ. Sci. and Arts, vol. 28, (ser. 2) p. 233; 



Wachsm. and Spr., Proc. Acad. Nat. Sci. Phila., p. 263. Keokuk limest. 



Crawfordville, Ind., and Hardin Co., Ky. 

 1860. Ollacr. typus Hall. (Trematocr. typus, type of that genus). Supp. Geol. 



Rep. Iowa., p. 73; Wachsm. and Spr. Ollacr. typus. Proc. Acad. Nat. 



Sci. Phila., p. 262. Upper Burlington limest. Burlington, Iowa. 



