240 



ECHINODERMA TA. 



[DIC. DOR. 



Dictyocrinus. Conrad. 1841, (Dictuocrinites,) 

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

 p. 135, syn. for Receptaculites. 

 squamifer, Hall, see Receptaculites squam- 

 ifer. 



DOLATOCRINOS, Lyon, 1857, Geo. Sur. Ky., 

 vol. 3, p. 482. [Ety. dolaius, 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 2 x 10 ; sometimes tertiary 

 radials 2 x 20 ; 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. 



FIG. 286. Dolatocriuus FIG. 287. Dolalocrinus 

 lacus. Side view. lacus. Ventral view. 



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

 cabocrinus glyptus var. intermedius.) 

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

 141, Ham. Gr. 



lacus, Lyon, 1857, Geo. Sur. 

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

 Held. Gr. 



lamellosus, Hall, 1862, 

 (Cacabocrinus lamello- 

 sus,) 15th Rep. N. Y. 

 St. Mus. Nat. Hist., p. 

 141, Up. Held. Gr. 

 liratus, Hall, 1862, (Caca- 

 bocrinus liratus,) 15th 

 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, (Cacabacrinus, troosti,) 

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

 138, Ham. Gr. 



FIG. 288. Dola- 

 tocrinas lacus. 

 Diagram of a 



Donacicrinites, Troost. Not defined. 



simplex, Troost. Not defined. 

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

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

 spear ; krinon, lily.] Body turbinate 

 or subglobose, truncate at the 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 where there are 

 tertiary radials, there are only 1x2 

 secondaries; arms 24 to 40; interradials 

 2 or 3, in two series ; azygous area very 

 different from the interradial areas, and 

 having several more plates and an 

 aperture near the top directed laterally ; 

 readily distinguished from Batocrinus 

 and Eretmocrinus by the lobed form 

 of the body, by the azygous area and 

 lateral opening, and by the shortness 

 of the arms. Type D. mississippi- 

 ensis. 



canaliculatus, Meek & Worthen, 1869, 

 Proc. Acad. Nat. Sci., p. 166, and Geo. 

 Sur. 111., vol. 5, p. 381, Burlington Gr. 



concavus, Meek & 

 Worthen, 1861, 

 (Actinocrinus con- 

 cavus,) Proc. Acad. 

 Nat. Sci. Phil., p. 

 131, and Geo. Sur. 

 111., vol. 2, p. 215, 

 Low. Burlington 



coSigems, Hall,1858, 

 (Actinocrinus cor- 

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

 lington Gr. 



gouldi, Hall, 1858, (Actinocrinus gouldi,) 

 Geo. Rep. Iowa, p. 613, Keokuk Gr. 



FIG. 290. Dorycrinus imma- 

 turus. 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. 



