240 



ECHINODERMA TA. 



[DIC. — DOR. 



Dictyocrinvs, Conrad, 1841, (Dictuocrinites,) 

 Ann. Rep. N. Y. and Pal. N. Y., vol. 3, 

 p. 135, syn. for Receptaculites. 

 squamifer, Hall, see Receptaculites squam- 

 ifer. 



Dolatocrinus, Lyon, 1857, Geo. Sur. Ky., 

 vol. 3, p. 482. [Ety. dolatus, hewn or 

 tooled ; krinon, lily.] Body subsphe- 

 roidal ; calyx basin-shaped ; vault hem- 

 ispherical, depressed in the interradial 

 areas; basals anchylosed and probably 

 numbering 5; radials 3x5; secondary 

 radials 2x10; sometimes tertiary 

 radials 2x20; arms 20 to 40, bifurcat- 

 ing and bearing pinnules ; interradials 5 

 or more, the first one large ; aperture sub- 

 central; column round. Type D. lacus. 

 canadensis, Whiteaves, 1887, Cont. to Can. 



Pal. vol. 1, p. 99, Ham. Gr. 

 glyptus, Hall., 1862, (Cacabocrinus glyp- 

 tus,) 15th Rep. N. Y. St. Mus. Nat. 'Hist., 

 p. 140, Ham. Gr. 



Fio. 286.— Dolatocriuus Fio. 

 lacus. SUle view. lac 



iilocrinus 

 I nil v lew. 



glyptus var. intermedius, Hall, 1862, (Ca- 

 cabocrinus glvptus var. intermedins.) 

 15th Rep. N. Y.St. Mus. Nat. Hist., p. 

 141, Ham. Gr. 



facus, Lyon, 1857, Geo. Sur. 

 Ky., vol. 3, p. 482, Up. 

 Held. Gr. 

 lamellosus, Hal), 1862, 

 (Cacabocrinus lamello- 

 sus,) 15th Rep. N. Y. 

 St. Mus. Nat. Hist., p. 

 141, Up. Held. Gr. 

 liratus, Hall, 1862, (Caca- 

 bocrinus liratus,,) L5th 

 Rep. N. Y. St. Mus. Nat. 

 Hist., p. 139, Ham. Gr. 

 liratus var. multilira, Hall, 

 1862, (Cacabocrinus li- 

 ratus var. multilira,) 15th 

 Rep. N. Y. St. Mus. Nat. 

 Hist., p. 139, Ham. Gr. 

 marshi, Lyon, 1869, Trans. Am. Phil. Soc, 



vol. 13, p. 461, Up. Held. Gr. 

 ornatus, Meek, 1871, Proc. Acad. Nat. Sci., 



p. 57, Up. Held. Gr. 

 speciosus, Hall, 1862, (Cacabocrinus speci- 

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

 Hist., p. 137, Up. Held. Gr. 

 triadactylus, Barris, 1885, Proc. Dav. Acad. 



Sci., vol. 4, p. 100, Ham. Gr. 

 troosti, Hall, 1862, (Cacabocrinus, troosti,) 

 15th Rep. N. Y. St. Mus. Nat. Hist., p. 

 138, Ham. Gr. 



Fio. 288.— Dola- 

 tocrinus lacus. 

 Diagram of a 

 ray. 



DonacicrinUes, Troost. Not defined. 



simplex, Troost. Not defined. 

 DORYCRINU8, Roemer, 1854, Archiv. f. Natur- 

 gesch Jahrg. 19, p. 207. [Kty. dory, 

 spear; krirwn, lily.] Body turbinate 

 or subglobose, truncate at tiie base, de- 

 pressed in the interradial spaces so as 

 to make it pentalobate ; dome convex 

 and usually bearing from 1 to 6 spines ; 

 basals 3 ; primary radials 3x5; second- 

 ary radials 2x2; or when there are 

 tertiary radials, there are only 1 x 2 

 secondaries; arms24to40; interradials 

 2 or 3, in two series; aayffoui UM very 

 different from the interradial areas, and 

 having several more plates and an 

 aperture near the top directed laterally ; 

 readilv distinguished from Batoerinus 

 and Eretmocrinus by the lobed form 

 of the body, by the azvgous area and 

 lateral opening, and by the shortness 

 of the arms. Type D. missi^sipin- 

 ensis. 



canaliculatus, Meek & Worthen, 

 Proc. Acad. Nat. Sci., p. 166, an.! 

 Sur. 111., vol. 5, p. 381, Burlington < I r. 



concavus, Meek & ^ v*<. r> 

 Worthen, 1861, OK^ Vpry 

 (Actinocrinus con- /~*\ j ~~}f" iO 

 cavus,) Proc. Acad. ri X^^SrQ a 



181. and I leo. Sur. <> i^VSt^' 

 III., vol. 2, p. 215, ^O'iki v 

 Low. Burlington 0O^?J 



( ' r ' 



cornigerus, Hall.1858, W SJSSl^3SSS^ 



(Actinocrinus cor- 

 nigerus,) Geo. Rep. Iowa, p. 576, Bur- 

 lington Gr. 

 gouldi, Hall, 1858, (Actinocrinus gouldi,) 

 Geo. Rep. Iowa, p. 613, Keokuk ( .1. 



Fig. 290.— Dorycrlnus imma- 

 1 in us. Posterior and ante- 

 rior views. 



immaturus, Wachsmuth & Springer, (in 

 press,) Geo. Sur. 111., vol. 8, p. 175, 

 Waverly or Kinderhook Gr. 



kelloggi, Worthen, 1875, Geo. Sur. 111. 

 vol. 6, p. 513, Keokuk Gr. 



