292 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
MELOCRINUS Gotprutss. 
1826. Goxpruss; Petref. Germanie, Vol. I., p. 197. 
1838. Acassiz; Mem. de la Soe. des Sci. natur. de Neuchatel, Vol. I., p. 196. 
1838. Goxpruss; Nova Acta, Acad. Leopoldina, Vol. XIX., L., p. 339. 
1841. Mérrer; Monatsber. d. Berlin. Akademie, p. 209. 
1849. D’Orsicny; Cours élément., Vol. II., p. 140. 
1852. Quenstept; Handb. d. Petrefactenkunde (Ausg. I.), p. 620. 
1855. Rormer; Lethaea Geognostica (Ausg. 3), p. 250. 
1857. Prcrer; Traité de Paléont., Vol. IV., p. 325. 
1862. Dusarpry and Hursé; Hist. natur. des Zoophytes, p. 144. 
1867. Scuurtze; Monogr. Echinod. Hifl. Kalk., p. 61. 2 
1878. AncELIN; Iconogr. Crin. Suec., p. 19. 
1879. Zirrer; Handb. d. Paleont., Vol. I., p. 371. 
1881. W. and Sp. ; Proceed. Acad. Nat. Sci. Phila., p. 292 
188]. W. and Sp.; Revision Paleoer., Part II., p. 118. 
1882. Dz Lorior; Paléont. Francaise, Tome XI. (Crinoides), p. 58. 
1885. W. and Spe.; Proceed. Acad. Nat. Sci. Phila., p. 326. 
1885. W. and Sp.; Revision Paleocr., Part III., p. 104. 
1885. QurnsteptT; Handb. d. Petrefactenkunde (Ausg. 3), p. 957. 
1889. S.A. Mitrer; N. Amer. Geol. and Paleont., p. 261. 
Syn. Cfenocrinus Bronn ; 1840, Jahrb., p. 542; also Miiller, 1855, Verh. naturh. Verein, Vol. NCES 
p. 16, and Neue Echinod. Hifl., Kalk., p. 255; also Follmann, 1857, Unterdevonische Crinoideen, 
p. 14. 
Syn. Castanocrinus RoEMER; 1855, Leth. Geogn. Vol. I., p. 252. 
Syn. Mariacrinus Hauu (in part); 1857, Paleont. N. Y., Vol. III., p. 104. 
Syn. Cytocrinus Rormer; 1860, Silur. Fauna West. Tenn., p. 46. 
Syn. Clonocrinus OEuLERT; 1879 (not Quenstedt), Soc. Géol. de France (sér. 3), Vol. VIL, p- 9. 
Syn. Turbinocrinites Troost; 1850, List of Crin. Tenn. (not defined). 
Syn. Astrocrinites Conrap; Ann. Geol. Rep. N. Y. of 1840 to 1841 (not Cumberland, 1826, nor 
Austin, 1842, nor Etheridge, Jun., 1876, nor Asterocrinus Minster, 1839, nor Lyon, 1857, nor 
Astrocrinus Ether. and Carpenter, 1886). 
Calyx obconical, subglobose or pyriform; the rays extended into free 
tubular appendages bearing arms on both sides. Basals four, unequal ; three 
of them quadrangular, the anterior one larger and pentangular. Radials in 
contact laterally ; four of them heptagonal, the anterior one, which rests 
squarely upon the anterior basal, hexagonal. First costal hexagonal, the 
second, which is axillary, generally pentagonal; the sloping faces of the 
latter may be equal and support two rows of distichals, or unequal, when 
only the longer inner face is followed by distichals, the shorter outer one 
giving off the proximal arm. In the former case, which is the general rule, 
the distichals constitute parts of the calyx, and both series terminate in 
axillaries, which give off toward the inner side of the ray in a nearly verti- 
eal direction an indefinite number of brachials of successive orders, and 
toward the outer side a sloping arm from each order. The plates of the 
different orders are short and consist of two parallel series, which form two 
arm-bearing trunks. The two trunks, as a general rule, meet laterally by 
