262 



ECHINODERMATA. 



[men.— nuc 



stewarti, Safford, 1869, 

 p. 346, St. Louis Gr. 



Geo. of Tenn. 



Fig. 366.— Melonites multiporus. Diagram, showing 

 pores In ambulacra! area, 2 ilium 



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

 body; krinon, lily.] Calyx somewhat 

 globular ; basais 3 ; subradials 1x5; ra- 

 dials 1x5; azygous and interradials 0; 

 which distinguishes the genus from 

 Platycrinus. Type M. olliculiformis. 

 This generic name is proposed as a 

 substiiute for Lecythiocrinus, White, 

 1880, because that name was preoc- 

 cupied by Mnller in 1858, and by 

 Zittel in 1879. 

 adamsi, Worihen, 1882, (Lecythiocrinus 

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

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

 p. 317, Coal Meas. 

 olliculiformis, White, 1880, (Lecythio- 

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

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

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

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

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

 mtros, hip-joint; krinun, lily.] Basais 5, 

 pentangular, low, broad ; subradials 5, 

 hexagonal, 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 fide, the ven- 

 tral tube, and on the other a row of 

 brachials ; arms long, hifurcating, with- 

 out pinnules. Type M. typus. 



curtus, Ulrich, 1879, (D» n- 



drocrinus curtus,) Cin. 



Soc. Nat. Hint., vol. 2, p. 



18, Utica Slate Gr. 

 corrohoratus, "Walcott, 



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



Mus. Nat. Hist., p. 210, 



Trenton Gr. 

 typus, Walcott, 1883, 35th 



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



Hist, p. 209, Trenton Gr. 

 Mespilocrimts, DeKoninck 



& L*Hon, 1854, Rech. 



Crin. Terr. Carb. Belg., 



p. 111. [Ety. mespilnm, 



medlar; krinon, lily.] 



Body Final], with amis 



globular or pyrifoim ; 



basais 3; subradials 5; 



arms 10, which divide 



Fig. 367.-Mero- 

 criuus curtus. 



radials 3x5 



once, taper rapidly, infold and incline 



obliquely from left to right; azygous 

 plate 1, resting upon the larger basal ; 

 column round. Type M. forbe- 

 sanus. 

 konincki, Hall, I860, 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. myelot, 

 the inside pith ; dadybis, finder.] 

 Body consisting of a coil roll* d, in 

 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.868.-.M\ .idd.ictylus bridgportensis. 



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

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

 agara Gr. 



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

 p. 192, Niagara Gr. 

 Myrtii.i.ochimis, Sandberger, 1856, Verst. 

 der Rhein. Schi. Svst. in Nassau. 

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

 Body subglobose or ovoid; hasals 5; 

 subradials 5; radials 1x5; dome con- 

 sisting of 5 plates alternating with the 

 radials; arms 5; columnar canal, quad- 

 rangular. Type M. elongatus. 



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

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

 Up. Held. Gr. 

 Nemalocrinvg, Meek & Worthen, 1866, Proc. 

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

 Catillocrinus. 

 Nipterocrinus, Wachsmuth, 1868, Proc. 

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

 nipter, washing vessel ; krinon, lily.] 

 Calyx basin-shaped ; basais 3, nearly 

 hidden by the column ; subradials 

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

 very large ; arms bifurcating; column 

 round. Type N. wachsmuthi. 



arboreus, Worthtn, 1863, Geo. Sur. 111., 

 vol. 5, p. 436, Butlington Gr. 



wachsmuthi, Meek & Worthen, 1868, 

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

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

 ton Gr. 

 Nuci.eocrinus, Conrad, 1842, Jour. Acad. 

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

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

 ellipsoidal ; basais 3, small, hidden 

 within the columnar cavity; radials 5, 

 forming a small cup, deeply scalloped 



