ECH.] 



ECHINODERMA TA. 



241 



lineatus, S. A. Miller, 1881, Jour. Gin. Soc. 

 Nat. Hist., vol. 4, p. 310, Burling- 

 ton Gr. 



mississippiensis, Roemer, 1853, Archiv. 

 fur Nat. Jahr. 19, p. 207, Keo- 

 kuk Gr. 



mississippiensis, var. spiniger, Hall, 1860, 

 Supp. to Geo. Sur. Iowa, p. 53, Keo- 

 kuk Gr. 



missouriensis, Shumard, 1858, (Actinocri- 

 nus missouriensis,) Geo. Rep. Mo., p. 

 190, Burlington Gr. 



parvibasis, Wachsmuth & Springer, (in 

 press,) Geo. Sur. 111., vol. 8, p. 177, Kin- 

 derhook Gr. 



FIG. 291.-Dorycrinus parvibasis. Anterior, 

 terior, and ventral views. 



parvus, Shumard, 1855, (Actinocrinus par- 

 yus,) Geo. Sur. Mo., p. 193, Upper Bur- 

 lington Gr. 



pendens, Hall, 1860, (Actinocrinus pen- 

 dens,) Supp. to Geo. Sur. Iowa, p. 31, 

 Burlington Gr. 



precursor, Hall, 1862, (Actinocrinus prse- 

 cursor,) 15th Rep. N. Y. St. Mus. Nat. 

 Hist., p. 131, Ham. Gr. 



quinquelobus, Hall, 1860, (Actinocrinus 

 quinquelobus,) Supp. to Geo. Rep. Iowa, 

 p. 15, Burlington Gr. 



FIG. 292. Dorycrinus radiatus. Posterior and 

 anterior views. 



quinquelobus var. intermedius, Meek & 

 Worthen, 1868, Proc. Acad. Nat. Sci., p. 

 346, and Geo. Sur. 111., vol. 5, p. 385, 

 Burlington Gr. 



radiatus, Wachsmuth & Springer, (in 

 press,) Geo. Sur. 111., vol. 8, p. 176, Kin- 

 derhook Gr. 



roemeri, Meek & Worthen, 1868, Proc. 

 Acad. Nat. Sci. Phil., p. 346, and 

 Geo. Sur. 111., vol. 5, p. 383, Burling- 

 ton Gr. 



spinulosus, Hall, 1860, (Actinocrinus 

 spinulosus,) Supp. Geo. Sur. Iowa, p. 

 52, Keokuk Gr. 



subaculeatus, Hall, 1858,( Actinocrinus sub- 

 aculeatus,) Geo. Rep. Iowa, p. 570, Burl- 

 ington Gr. 



subturbina- 

 tus, Meek & 



Worthen, 

 1860, (Acti- 

 n o c r i n u s 

 subturbina- 

 tus,) Proc. 

 Acad. Nat. 

 Sci.Phil.,p. 

 388, and 

 Geo. Sur. 



Til vnl 9 '. 



o%o ri 'FiG. 293. Dorj crinus subtur- 

 p. 212, Bur- binatus. Diagram, 



lington Gr. 



symmetricus, Hall, 1858, (Actinocrinus 

 symmetricus,) Geo. Sur. Iowa, p. 574, 

 Burlington Gr. 



trinodus,) Hall, 1858, (Actinocrinus tri- 

 nodus,) Geo. Sur. Iowa, p. 575, Burling- 

 ton Gr. 



unicornis, Owen & Shu- 

 mard, 1850, (Actinocri- 

 nus unicornis,) Jour. 

 Acad. Nat. Sci. Phil., 

 vol. 2, new ser., p. 67, 

 and Geo. Sur. 111., vol. 

 5, p. 380, Burlington 

 Gr. 



unispinus, Hall, 1861, Ac- 

 tinocrinus unispinus,) 

 Desc. New Crinoidea, 

 p. 2, and Bost. Jour. 

 Nat. Hist,, vol. 7, p. 270, 

 Burlington Gr. 

 Echinocystites, Hall, 1864, 20th Rep. N. Y. 

 St. Mus. Nat. Hist., p. 360. The name 

 was preoccupied by Wyville Thompson. 

 See Lysocystites. 

 nodosus, see Lysocystites nodosus. 

 ECHINODISCUS, Worthen & Miller, 1883, Geo. 

 Sur. 111., vol. 7, p. 335. [Ely. echinos, 

 sea urchin ; diskos, quoit,] Body dis- 

 coid ; depressed convex, larger plates in 

 the center of the interradial areas, none 

 imbricating; narrow elongate plates 

 form the border and pass to the under 

 side forming a non-sessile rim ; ambu- 

 lacra 5, connected near the center, 

 and composed of numerous interlocking 

 plates; mouth central or subcentral. 

 Type E. optatus. 



kaskaskiensis, Hall, 1858, (Agelacrinus 

 kaskask'ensis,) Geo. Sur. Iowa, p. 696, 

 Kaskaskia Gr. 



optatus, Worthen & Miller, 1883, Geo. 

 Sur. 111., vol. 7. p. 336, Kaskaskia 

 Gr. 



Echino-encrinites, Meyer, 1826, Karst. Archiv. 

 Nat., vol. 7. [Ety. echinos, sea urchin ; 

 krinon, lily.] 



anatifoi-mis, see Glyptocystites anatiformis. 

 fenestratus, Troost. Not defined. 

 Echinus drydenensis, see Eocidaris dryden- 



ensis. 

 gyracanthus, see Tentaculites gyracanthus. 



FIG. 294. Dorycri- 

 nus unicornis. 



