376 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 



linear, smaller than the second, quadrangular with convex upper and lower 

 faces ; the second pentangular, very little wider and longer than the first. Dis- 

 tichals two ; the upper one wider than the costal axillary ; followed by two 

 palmars in two series except in the division facing the anal side, in which 

 there is but one palmar which is axillary and gives off two post-palmars. 

 At four sides the palmars meet with their fellows of adjoining rays, but at 

 the anal side only the post-palmars. Arm openings equidistant, directed 

 horizontally. Arms twenty-two, short, rounded on the back ; composed of 

 two series of moderately long joints, distinctly interlocking. Interradials 

 from one to three ; the first very large, slightly elongate ; the upper ones, 

 if present, quite small. Anal plate longer than the radials, supporting three 

 and two plates. Ventral disk low hemispherical, the plates convex. The 

 orals and radial dome plates, which are more or less tumid, are separated 

 by numerous small supplementary pieces. Anal tube long, subcentral, con- 

 structed of convex pieces. 



Horizon and Locality. — Same as last. 



Type in the (Worthen) Illinois State collection, Springfield. 



Batocrinus turbinatus, var. elegans Hall. 

 Plate XXVII. Figs. 6a, h. 



1853. Acthtocrimis turbinatun, var. eleijans — Hall; Geol. Eep. Iowa, Vol. I., Part II., p. 5SS, Plate 11., 



Fig. 5. 

 1881. Batocriims turbinatus, var. elegans — W. and Sp. ; Eevision Palseocr., Part II., p. 16S. 



More elongate than the typical form ; the dorsal cup nearly twice as high 

 as the ventral disk; sides convex from the top of the basals to the arm 

 facets. Basal disk short, distinctly lobed and spreading outward. Eadials, 

 costals, distichals, and palmars arranged as in the typical form, but there 

 are quite frequently twenty arms (four to each ray) in place of twenty-two; 

 and the plates forming the arm bases are less projecting. 



Horizon and Locality. — Same as last. 



Type in the (Worthen) Illinois State collection. 



Batocrinus Macbridei W. and Sp. 

 Plate XXX. Figs. 1, 2, 3. 



1887. W. and Sp. ; Geol Kep. IlUnois, Vol. Vlll., p. 172, Plate 15, Fig. 4, and Plate 17, Figs. 11 



and 13. 

 1890. S. A. MiLLEK ; North Amer. Geol. and Palaiont., p. 228, Fig. 253. 



