AG A. — AGE.] 



ECHINODERMA TA. 



221 



Fig. 238.— Agaricocrinus 

 elegans, basal view. 



and Ohio Pal., vol. 2, p. 164, Wa- 

 verly Gr. 



excavat us, Hall, 



1861, (Actinocri- 



nus excavat us,) 



Desc. New Spec. 



Crin., p. 3, and 



Bost. Jour. Nat. 



Hist., p. 282, Bur- 



lington Gr. 



Wachsmuth says 



it is a syn. for A. 



americanus. 



fiscellus, Hall, 1861, 



( Actinocrinusfis- 



cellus,) Desc. 



New Spec. Crin., p. 2, and Bost. Jour. 



Nat. Hist., p. 272, Burlington Gr. 



geometricus, Hall, 1860, Supp. to Geo. 



Sur. Iowa, p. 56, Burlington Gr. 

 gracilis, Meek & Worthen, 1861, Proc. 

 Acad. Nat. Sci. Phil., p. 135, Burling- 

 ton Gr. 

 helice, Hall, 1864, (Ac 

 tinocrinus helice, 

 17th Rep. N. Y. St. 

 Mus. Nat. Hist., p. 

 53, and Ohio Pal., 

 vol. 2, p. 163, Wa- 

 verly Gr. 

 inflatus, Hall, 1861, 

 Desc. New Criniodea, 

 p. 4, and Bost. Jour. 

 Nat. Hist., p. 284, 

 Burlington Gr. 

 macadamsi, Worthen, 

 (in press,) Geo. Sur. 

 111., vol. 8, p. 94, 

 Keokuk Gr. 

 nodosus, 'Meek & 



Worthen, 1869, Proc. Acad. Nat. Sci. 

 Phil., p. 167, and Geo. Sur. 111., vol. 5, 

 p. 387, Burlington Gr. Wachsmuth 

 says it is a syn. for A. americanus. 

 nodulosus, Worthen, (in press,) Geo. Sur. 



111., vol. 8, p. 94, Keokuk Gr. 

 ornotrema, Hall, 1861, Desc. New Crin- 



oidea, p. 3, Burlington Gr. 

 pentagonus, Hall, 1860, Supp. Geo. Rep. 



Iowa, p. 57, Burlington Gr. 

 pentagonus var. convexus,-8ee A. convexus. 

 planoconvexus, Hall, 1861, Desc. New 

 Crinoidea, p. 3, and Bost. Jour. Nat. 

 Hist, p. 280, Burlington Gr. 

 pyramidatus, Hall, 1858, (Actinocrinus 

 pyramidatus,) Geo. Rep. Iowa, p. 565, 

 Burlington Gr. 

 springeri, White, 1882, 11th Rep. Geo. 

 and Nat. Hist. Indiana, p. 363, Keo- 

 kuk Gr. 

 stellatus, Hall, 1858, Geo. Rep. Iowa, p. 



564, Burlington Gr. 

 tuberosm, Troost, 1850, Catal. Hall. 1858, 

 Geo. Rep. Iowa, p. 617, syn. for A. 

 americanus. 

 whitfieldi, Hall, 1858, Geo. Rep. Iowa, 



p. 621, Keokuk Gr. 

 wortheni, Hall, 1858, Geo. Rep. Iowa, p. 

 619, Keokuk Gr. 



Fig. 239— Agarico- 

 crinus helice. 



Agassizocrinus, Troost, 1850 Mss., Shu- 

 mard, 1853, Marcy's Rep. Red Riv., and 

 Hall, 1858, Geo. Rep. Iowa, p. 684. 

 [Ety. proper name ; krinon, lily.] Calyx 

 conical or semielliptical; not ornamental; 

 basals 5, usually anchylosed, very 

 small inner cavity; subradials 5, thick, 

 usually anchylosed; radials 2x5; arms 

 10 ; azygous plates 3 or 4 ; column evi- 

 denced by a small cylindrical tube ex- 

 tending from a minute cicatrix at the 

 center of the basals to the interior of 

 the cup. Type A. dactyliformis. 

 carbonarius, Worthen, 1873, Geo. Sur. 



Ill, vol. 5, p. 566, Up. Coal Meas. 

 chesterensis, Worthen, 1873, Geo. Sur. 



111., vol. 5, p. 558, Kaskaskia Gr. 

 conicus, Owen & Shumard, 1851, Jour. 

 Acad. Nat. Sci, Phil., 2d. ser., vol. 2, p. 

 93, and Geo. Sur. 111., vol. 5, p. 557, 

 Kaskaskia Gr. 

 constrictus, Hall, 1858, Geo. Rep. Iowa, 



p. 687, Kaskaskia Gr. 

 dacty liformis, 

 Troost, 18 5 0, 

 described by 

 Shumard, 1853, 

 Marcy's Rep. 

 Red. Riv., p. 

 199, Kaskaskia 

 Gr. 

 gibbosus, Hall, 

 1858, Geo. Rep. 

 Iowa, p, 686, 

 Kaskaskia Gr. 

 globosus, Worth- 

 en, 1873, Geo. 

 Sur. 111., vol. 5, 

 p. 557, Kaskas- 

 kia Gr. 

 gracilis, Troost, 

 1850. Not de- 

 fined, 

 hemispheric us, 

 Worthen, 1882, 

 Bull. No. 1, 111. 

 St. Mus. Nat. 

 Hist., p. 37, and 

  Geo. Sur. 111., 

 vol. 7, p. 316, 

 Kaskaskia Gr. 

 occidentalis, 

 Owen & Shumard, 1852, (Poteriocrinus 

 occidentalis,) Jour. Acad. Nat. Sci. 

 Phil., vol. 2, p. 92, Kaskaskia Gr. 

 papillatus, Worthen, 1882, Bull. No. 1, 

 111. St. Mus. Nat. Hist., p. 36, and Geo. 

 Sur. 111., vol, 7, p. 315, Kaskaskia Gr. 

 pentagonus, Worthen, 1873, Geo. Sur. 



111., vol. 5, p. 556, Kaskaskia Gr. 

 tumidus, Owen & Shumard, 1852, (Poteri- 

 ocrinus tumidus,) Jour. Acad. Nat. Sci. 

 Phil., vol. 2, p. 90, Kaskaskia Gr. 

 Agelacrinus, Vanuxem, 1842, (Agelacri- 

 nites,) Geo. Rep. 3d Dist. N. Y., p. 158. 

 [Ety. agele, herd ; krinon, lily.] A thin, 

 circular, parasitic disk ; upper face more 

 or less convex, aud composed of thin 

 imbricating plates ; ambuh era consist- 



Fig. 240. — Agassizocrinus 

 dactyliformis. 



