258 



ECHINODERMA TA. 



moorii, Meek, 1871, (Lepocrinites moorii,) 

 Am. Jour. Sci., 3d series, vol. 2, p. 296, 

 and Ohio Pal., vol. 1, p. 39, Hud. 

 Riv. Gr. 



LEPIDECHINUS, Hall, 1861, Desc. New Spec. 

 Crinoidea, p. 18. [Ety. lepis, scale ; 

 echinus, sea-urchin.] Subspheroidal ; 

 ambulacral area having a double row of 

 plates imbricating downward, with two 

 pores in each plate, near the outer end ; 

 interambulacral areas wide, and having 

 numerous ranges of plates, imbricating 

 from below upward, and from the cen- 

 ter outward. Type L. imbricatus. 



imbricatus, Hall, 1861, Desc. New Cri- 

 noidea, p. 18, Burlington Gr. 



rarispinus, Hall, 1867, 20th Rep. N. Y. 



St. Mus. Nat. Hist., p. 340, Waverly Gr. 



LEPIDESTHES, Meek & Worthen, 1868, Geo. 



Sur. 111., vol. 3, p. 522. [Ety. lepis, 



scale ; esthes, garment.] Subspheroidal ; 



i 



FIG. 350. Leptdesthes coreyi. Diagram 3 diam.; (a.) ambulacrals 

 (6.) section of them ; position of interambulacrals. 



ambulacral areas wide, having numer- 

 ous plates, and imbricating from above 

 downward, and having two pores in 

 each plate, nearly central; interam- 

 bulacral areas narrow, plates im- 

 bricating from below upward, as 

 well as outward from the middle; 

 jaws well developed ; surface granular. 

 Type L. coreyi. 



colletti, White, 1878, Proc. Acad. Nat. 

 Sci. Phil., p. 33, and Cont. to Pal., No. 

 8, p. 163, Keokuk Gr. 



coreyi, Meek & Worthen, 1868, Geo. Sur. 

 111., vol. 3, p. 525. Keokuk Gr. 



formosus, S. A. Miller, 1879, Jour. Gin. 

 Soc. Nat. Hist., vol. 2, p. 41, Ke- 

 okuk Gr. 



LEPIDOCIDARIS, Meek & Worthen, 1873, Geo. 

 Sur. 111., vol. 5, p. 478. Ety. lepis, 

 scale; Cidaris, a genus.] Body large, 

 globose, eight or more rows of im- 

 bricating plates in the middle of each 

 interambulacral area, but only two reach 

 the oral apertures; plates hexagonal or 

 pentagonal ; tubercles for the support 

 of primary spines smooth and in the 

 center of each plate ; pustules near the 

 outer edge of the plates for the second- 

 ary spines; ambulacra narrow; plates 

 slightly imbricating in the opposite 

 direction from the interambulacral 

 series, and each pierced by two pores ; 

 jaws strong. Type L. squamosus. 



squamosus, Meek & Worthen, 1873, Geo. 



Sur. 111., vol. 5, p. 478, Burlington Gr. 

 LEPIDODISCUS, Meek & Worthen, 1875, Geo. 

 Sur. 111., vol. 5, p. 573. [Ety. lepis, 

 scale; diskos, quoit.] A proposed sub- 

 genus for Agelacrinus, founded upon 

 A. squamosus. 



Lepocrinites, Conrad, 1840. The correct 

 orthography seems to be Lepadocrinus. 

 rnoorei, Meek, see Lepadocrinus moorii. 

 LICHENOCEINUS, Hall, 1866, Adv. sheets 24th 

 Rep. N. Y. St. Mus. Nat. Hist., p. 216. 

 [Ety. lichen, tree-moss; krinon, lily.] Body 

 parasitic, discoid, more or less crateri- 

 form, from the center of which arises a 

 long tapering column, each ring of 

 which is composed of small interlock- 

 ing plates; upper surface of body 

 covered with polygonal plates, which 

 are supported in the interior by numer- 

 ous radiating lamellse. Type L. dyeri. 

 affinis.S. A." Miller, 1882, 

 Jour. Cin. Soc. Nat. 

 Hist., vol. 5, p. 229, 

 Hud. Riv. Gr. 

 crateriformis, Hall, 1866, 

 Adv. sheets 24th Rep. 

 N. Y. St. Mus. Nat. 

 Hist,, p. 217, Hud. 

 Riv. Gr. 



dubius, S. A. Miller, 

 1880, Jour. Cin. Soc. 

 Nat. Hist,, vol. 3. p. 

 234, Utica Slate Gr. 

 dyeri, Hall, 1866, Adv. 

 sheets, 24th Rep. N. Y. 

 Hist., p. 216, Hud. 



Mus. Nat, 



FIG. 351. Licheiiocrinus ttiberculatus ; one speci- 

 men shows the radiating lamelice. 



pattersoni, S. A. Miller, 1879, Jour. Cin. 



Soc. Nat. Hist., vol. 2, p. 118, Utica 



Slate Gr. 

 tuberculatus,S.A. 



Miller, 1874, 



Cin. Quar. Jour. 



Sci., vol. 1, p- 



346, Hud. Riv. 



Gr. 

 LYRIOCRINITS, Hall, 



1852, Pal. N. Y., 



vol. 2, p. 197. 



[Ety. lyrion, 



small lyre; 



krinon , lily.] 



Calyx h e m i - 



spherical; bapals 



5 ; subradials 5 ; 



primary radials 



3x5; secondary Fl 



radials 2 x 10 ; 



interradial areas 4 or 5, which are in 



closed above by the secondary radials ; 



352 Lyriocrinus dac- 

 tylus. Side view. 



