518 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 



Basals small, only their upper angles exposed beyond the column. Eadi- 

 als and costals nearly of uniform size. Distichals two, a little smaller than 

 the costals. Palmars five or six in the calyx, comparatively large, very 

 gradually decreasing in size; succeeded by free arm plates of the same 

 order. Arms twenty, not branching, slender, cylindrical, composed of short 

 cuneiform pieces. Interbrachials : 1, 2, 3, 2, 2, 2, etc. ; the anal side wider, 

 containing a longitudinal row of anal plates marked by a strong ridge. 

 Interdistichal and intei'palmar areas unusually large, the former composed 

 of five or more rows. Construction of ventral disk not known. Column 

 q^uadrangular, with rounded angles and slightly concave sides. 



Horizon and Locality. — Upper part of Hudson River group, Waynes- 

 ville, 0. 



Ti/pe in the collection of I. H. Harris, Esq., at Waynesville. 



Compsocrinus miamiensis (S. A. Millek). 

 Plate XXI. Figs. 7a, h. 



1882. Ghjptocnms miamiensis — S. A. Miller; Jouru. Cincin. Soc. Kat. Hist., Vol. V., Plate 1, Fig. 1. 



1883. Glyftocrinus miamiensis — W. and Sp. ; Amer. Journ. Sci., Vol. XXV., p. 2G5. 



1883. Gli/ptocrinus miamiensis — S. A. Milleb; Journ. Cincin. Soc. Nat. Hist., Vol. VI., p. 224. 

 1885. Glypiocrinus miamiensis — W. and Sp., Revision Palseoer., Part III., p. 104. 



Calyx elongate ; the rays followed by strong ridges, which occupy one 

 half the width of the plates. There are no ridges upon the interbrachials 

 or upon any of the other plates, the surface of the calyx is covered with 

 minute, irregularly arranged pustules, which are not readily seen except 

 under a magnifier. 



Basals moderately large, forming a good-sized cup ; the posterior one 

 largest and broadly truncated above ; the truncate face of the anterior 

 one somewhat narrower; the two others forming a right angle. Eadials 

 and costals of about equal size, but in the former the proximal side is 

 angular, in the others the distal. The posterior rays have two large dis- 

 tichals, followed by three to four palmars which support the arms ; the 

 three anterior rays have from four to five distichals in the calyx and no 

 palmars, giving fourteen arms to the species. Interbrachials: 1, 2, 2, 2, 2, 

 etc. The anal side has an additional row of anal plates following the median 

 line. Structure of ventral disk and anal opening unknown. Column ob- 

 scurely quadrangular, with a small pentangular canal. 



