262 



ECHINODERMA TA. 



[MEN. NUC. 



stewarti, Safford, 1869, Geo. of Tenn., 

 p. 346, St. Louis Gr. 



FIG. 366. Melonites multiporus. Diagram, showing 

 pores in ambulacra! area, 2 uiam. 



MINOCRINUS, n. gen. Ety. menos, strength of 

 body ; krinon, lily.] Calyx somewhat 

 globular; bapals 3; subradials 1x5; ra- 

 dials 1x5; azygous and interradials ; 

 which distinguishes the genus from 

 Platycrinus. Type M. olliculiformis. 

 This generic name is proposed as a 

 substitute for Lecythiocrinus, White, 

 1880, because that name was preoc- 

 cupied by Muller in 1858, and by 

 Zittelin 1879. 



adamsi, Worthen, 1882, (Lecythiocrinus 

 adamsi,) Bull. No. 1, 111. St. Mus. Nat. 

 Hist., p. 37, and Geo. Sur. 111., vol. 7, 

 p. 317, Coal Meas. 



olliculiformis, Wl.ite, 1880, (Lecythio- 

 crinus olliculiformis,) Proc. U. S. Nat. 

 Mus., vol. 2, p. 257, and Cont. to Pal., 



No. 6, p. 124, Up. Coal. MeaP. 

 MEBOCRINCS, Walcott, 1883, 35th Rep. N. Y. 

 St. Mus. Nat. Hist,, p. 208. [Ety. 

 meros, hip- joint; krinon, lily.] Basals 5, 

 pentangular, low, broad ; subradials 5, 

 nexagc nal, short, broad; radials pen- 

 tagonal, four support upon the upper 

 truncate face of each a row of six or 

 seven brachials, and the azygous plate 

 from the same level, the fifth radial ; 

 right posterior radial like the azygous 

 plate, but having an angular upper 

 side, giving off, on one side, the ven- 

 tral tube, and on the other a row of 

 brachials ; arms long, bifurcating, with- 

 out pinnules. Type M. typup. 



curtus, Ulric'h, 1879, (D^n- 



drocrinus curtus,) Cin. 



Soc. Nat. Hit4., vol. 2, p. 



18, Utica Slate Gr. 

 corroboratus, Walcott, 



1883, 35th Rep. N. Y. St. 



Mus. Nat. Hist., p. 210, 



Trenton Gr. 

 typus, Walcott, 1883, 35th 



R*p. N. Y. St. Mus. Nat. 



Hist., p. 209, Trenton Gr. 

 MESPILOCRINUS, DeKoninck 



& Lt-Hon, 1854, Rech. 



Grin. Terr. Carb. Belg., 



p. 111. [Ety. mes^ilum, 



medlar; krinon, lily.] 



Body tmall, with arms 



globular or pyrifoim ; 



basals 3; subrndiuls 5; 

 radials 3x5; arms 10, which divide 

 once, taper rapidly, infold and incline 



FIG. 367. Mero- 

 criuus curtus. 



obliquely from left to right; azygous 

 plate 1, resting upon the larger basal ; 

 column round. Type M. forbe- 

 sanus. 

 konincki, Hall, 1860, Supp. to Geo. 



Sur. Iowa, p. 69, Burlington Gr. 

 scitulus, Hall, 1861, Desc. New Cri- 



noidea, p. 9, Burlington Gr. 

 MYELODACTYLUS, Hall, 1852, Pal. N. Y., 

 vol. 2, p. 191. [Ety. myelos, 

 the inside pith ; daclylns, finger.] 

 Body consisting of a coil rolled, iu 

 the same plane, with finger-like 

 processes, from each coil, over- 

 lapping the next inner one ; coil and 

 processes perforated so as to form con- 

 necting channels. Type M. convolutus. 

 brachiatus, Hall, 1852, Pal. N. Y., vol. 2, 

 p. 232, Niagara Gr. 



FIG. 368. Myelodactylus bridgportensis. 



bridgportensis, S. A. Miller, 1880, Jour. 

 Cin. Soc. Nat. Hist., vol. 3, p. 141, Ni- 

 agara Gr. 



convolntus, Hall, 1852, Pal. N. Y., vol. 2, 



p. 192, Niagara Gr. 



MYRTILLOCRIMJS, Saridberger, 1856, Verst. 

 der Rhein. Schi. Svst. in Nas-sau. 

 [Ety. myrtillus, myrtle; krinon, lily.] 

 Body subglobose or ovoid; basals 5; 

 subradials 5 ; radials 1x5; dome con- 

 sisting of 5 plates alternating with the 

 radials; arms 5; columnar canal, quad- 

 rangular. Type M. elongatup. 



arm ricanus, Hall, 1862, 15th Rep. N. Y. 

 St. Mus. Nat. Hist., App. C., p. 114, 

 Up. Held. Gr. 



Nematocrinm, Meek & Worthen, 1866, Proc. 

 Acad. Nat. Sci. Phil., p. 251, syn. for 

 Catillocrinup. 



NIPTEROCRINUS, Wachpmutb, 1868, Proc. 

 Acad. Nat. Sci. Phil., p. 341. [Ety. 

 nipter, washing vessel ; krinon, lily.] 

 Calyx basin-shaped ; basals 3, nearly 

 hidden by the column ; subradials 

 1x5; radials 3 or 4x5, the first one 

 very large ; arms bifurcating; column 

 round. Tvpe N. wachsmuthi. 



arboreus, Worthen, 1863, Geo. Sur. 111., 

 vol. 5, p. 436, Builington Gr. 



waclismuthi, Meek & Worthen, 1868, 

 Proc. Acad. Nat. Sci. Phil., p. 341, and 

 Geo. Sur. 111., vol. 5, p. 435, Burling- 

 ton Gr. 



NCCLEOCRINUS, Conrad, 1842, Jour. Acad. 

 Nat. Sci. Phil., vol. 8, p. 280, [Ety. 

 nvclev*, a little nut: krinon, lily.] Calyx 

 ellipsoidal ; basals 3, pmall, hidden 

 within the columnar cavity; radials 5, 

 forming a small cup, deeply scalloped 



