390 THE CEINOIDEA CAMEEATA OF NORTH AMERICA. 



Eretmocrinus remibrachiatus, var. expansus w. and Sp. (nov. var.). 

 Plate XXXVI. Fig. 1 ; Plate XXXVII. Figs, la, b, and Plate XII V. Fig. 9. 



Batocrimts {Eretmocrinus) remibrachiatus (in part) — Meek and Worthen ; Geol. Rep. Illinois, Vol. Y., 



p. 370, Plate 10, Kg. 5. 

 Eretmocrinus ramiilosus (in part) — W, and Sp. ; 1878, Proceed. Acad. Nat. Sci. Pliila., p. 236, and 1S81, 

 Revision Palasocr., Part II., p. 173. 



Syn, Eretmocrinus cassedai/amis Millee and GuKLEY, 189i ; lUiaois Geol. Surv., Bull. 3, p. 17, 

 Plate 3, Fig. 1. 



Larger than the typical form; the ventral disk more bulging and com- 

 paratively higher ; the plates more tumid ; the anal tube shorter and more 

 slender ; the costals proportionally larger, the second frequently hexagonal 

 or heptagonal owing to the comparatively small size of the first interbrachial. 

 The palmars of the two posterior ra^'s in the subdivision next to the anal 

 interradius consist of but one plate, wliich is axillary and supports two post- 

 jDahnars, thus giving to those rays five arms in place of four. The arms at 

 their widest parts sometimes reach a width of from 18 to 20 mm. ; they are 

 in the majority of specimens spread out horizontally to one half their lengtli, 

 when they curve abruptly upward and inward, and fold back in a straight 

 line to the calyx, forming a flat, circular disk, in which the serrated edges of 

 the arms frequently intei'lock with those of adjoining arms. 



Horizon and Locality. — Burlington and Keokuk Transition bed; near 

 Burlington, Iowa, and Henderson Co., Ills. 



Types in the collection of Wachsmuth and Springer. 



Eretmocrinus granuliferus W. and Sp. (nov. spec). 

 Plate XXXIV. Figs. 5a, b, c. 



Tliis species has its closest affinities with P. remibrachiatus, from which, 

 as well as from all other species of this genus, it differs in its unique orna- 

 mentation. While in that species the plates are flat and perfectly smooth, 

 they are here slightly convex, and the whole dorsal cup is covered by irregu- 

 lar but distinct granules or small nodes, densely crowding the surface. There 

 are no ridges or strise either on the radial or interradial plates. Dorsal cup 

 wider than high, rapidly spreading from tlie top of the basals to the arm 

 regions. 



Base broadly truncated, expanding laterally into a broad trilobate rim, 

 flat at the bottom except in the middle, which to one third the width of the 



