OKI.. DOR.] 



ECHINODERMA TA. 



677 



and the other two hexagonal ; second 

 radials quadrangular; third radials pent- 

 agonal, and bear on the upper slop- 

 ing sides secondary 

 radials; regular inter- 

 radials numerous ; the 

 first one large and 

 resting between the 

 short upper sloping 

 sides of the first radials; 

 Fig. 1222.— Cyphocri- it is followed, in the 

 3£r£2&-x. 81de second range by two 

 plates, and by three 

 plates in succeeding ranges until they 

 unite with the plates of the vault ; inter- 

 secondary radials present ; first azygous 

 plate large, truncates a subradial, and 

 is followed by three or four plates in 

 each succeeding range, until they unite 

 with the plates of the vault ; vault con- 

 vex and covered with more or less nu- 

 merous plane, convex, or spinous 

 plates; a large spinous plate occupies 

 the center of the vault, and the anal 

 orifice, without any prominence, is on 

 the azygous side of it. Type Cyph- 

 ocrinus gorbyi, described at the same 

 place from the Niagara Gr. 

 Delocrinus, Miller and Gurley, 1890, Jour. 

 Cin. Soc. Nat. Hist., vol. 13. p. 9, and 

 16th Rep. Geo. Sur. Ind., p. 333. [Ety. 

 delos, manifest; krinon, lily.] Calyx 

 basin- shaped ; arms broad, composed of 

 a double series of interlocking plates ; 

 column round ; surface smooth or granu- 

 lous ; plates thick ; basals 5, occupying 

 a concavity and forming a cone in the 

 interior ; subradials 5, large, inflexed 

 '■ below the middla, regularly arched, and 

 the upper part terminating in an acute 

 angle ; first radials wider than high, 

 truncated above and separated from the 

 second radial on the outer face by a 

 gaping suture, but immediately within, 

 a straight crenated ridge extends from 

 one outer angle of the plates to the 

 other, having a furrow on each side so 



Fig. 1223.— Delocrinus hemisphericus. 



as to form a toothed hinge on which the 

 second plate articulates ; behind this 

 hinge, in the middle part of each plate, 

 there is a socket for the reception of a 



tooth-like projection ; second radials or 

 brachials produced externally in a strong 

 spine ; no regular interradials ; one 

 azygous interradial resting on a sub- 

 radial and followed by another piece 

 above the top of the calyx. Type D. 

 hemisphericus. 



craigi, Worthen, 1875, (Eupachycrinus 

 craigi,) Geo. Sur. 111., vol 6, p. 527, Coal 

 Meas. 



fayettensis, Worthen, 1873, (Eupachycri- 

 nus fayettensis,) Worthen, Geo. Sur. 

 111., vol. 5, p. 565, Up. Coal Meas. 



hemisphericus, Shumard, 1858, (Poteri- 

 ocrinus hemisphericus,) Trans. St. Louis 

 Acad. Sci., vol. 1, p. 221, and 16th Rep. 

 Geo. Sur. Ind., p. 335, Up. Coal 

 Meas. 



inflexus, Geinitz, 1866, (Cyathocrinus 

 inflexus,) Carb. und Dyas, in Neb., 

 p. 62, and White's Cont. to Pal., No. 6, 

 p. 128, Up. Coal Meas. 



missouriensis, Miller and Gurley, 1890, 

 Jour. Cin. Soc. Nat. Hist., vol. 13, p. 14. 

 Up. Coal Meas. 

 Dendrocrinus nodobrachiatus, Ringueberg, 

 1890, Ann. N. Y. Acad. Sci., vol. 5, 

 p. 303, Niagara Gr. « 



Dichocrinus blairi, S. A. Miller, 1891, Ad- 

 vance Sheets 17th Rep. Geo. Sur. Ind., 

 p. 36, Keokuk Gr. 

 cinctus, Miller & Gurley, 

 1890, Jour. Cin. Soc. Nat. 

 Hist., vol. 13, p. 21, and 

 16th Rep. Geo. Sur. Ind., 



Fig. 1224.— Dichocrinus cinctus. Two of the views 

 are magnified. 



p. 342, Kinderhook or Waverly Gr. 



humbergi, S. A. Miller, 1891, Bull. No. 4, 

 Geo. Sur. Mo., p. 26, and Advance Sheets 

 17th Rep. Geo. Sur. Ind., p. 36, Ke- 

 okuk Gr. 



parvulus, S. A. Miller, 1891, Bull. No. 4, 

 Geo. Sur. Mo., p. 27, Keokuk Gr. 



ulrichi, Miller & Gurley, 1890, Desc. 

 New Gen. and Spec. Echinodermata, 

 p. 48, and 16th Rep. Geo. Sur. Ind., 

 p. 366, Keokuk Gr. 

 Dolatocrinus has only three basals, as 

 shown by a specimen belonging to Mr. 

 Gurley. 

 Dorycrinus amcenus, and D. confragosus, 

 S. A. Miller, 1890, Bull. No. 4, Geo. Sur. 

 Mo., p. 34, Burlington Gr. 



elegans, S. A. Miller, 1892, Advance Sheets 

 18th Rep. Geo. Sur. Ind., p. 17, Bur- 

 lington Gr. 



