398 THE CEINOIDEA CAIIEEATA OF NORTH AMERICA. 



as no figure is given, and the description is insufficient for identification, we 

 are compelled to ignore it for the present. Even the figure given by Whit- 

 field (Mem. Amer. Mus. Nat. Hist. N. York, Plate 1, Figs. 23 and 24), made 

 from a weathered specimen, does not aid us in distinguishing the form. 



Eretmocrinus cloelia Hall. 

 Plate XXXVI. Figs. 4a, b. 



1861. Actiiwcrinus clcelia — Hall; Prelim. Descr. of New Spec, of Crin., p. 1, and Bost. Joum. Nat. 



Hist., Vol. VII., p. 266. 

 1873. Satocrinus (Evetmocr.') clcelia — Meek and WoKTHEN ; Geol. Eep. Illinois, Vol. T., p. 36S. 

 1881. Eretmocrinus clcelia — W. and Sp. ; Revision Palseocr., Part 11., p. 173. 



A little larger than the preceding species. Calyx about as high as wide, 

 broadly truncated at the bottom, the sides of the dorsal cup gently expand- 

 ing to the arm bases. Plates spinous, subspinous or nodose ; the suture lines 

 slightly depressed. 



Base short ; the plates distinctly angular at their upper faces-; the bottom 

 broadly truncate and perfectly flat, except the central part which is slightly 

 excavated for the reception of the column ; the suture lines deeply grooved. 

 In some specimens there is a longitudinal groove following the median line 

 of the basals, which makes the base appear hexapartite, especially if the 

 respective parts, as in some cases, are extended outward into spines. Eadials 

 of moderate size, wider than long, the upper face concave, the surface cov- 

 ered with a transverse spine or node. Costals rather large ; the first quad- 

 rangular, convex at the upper and lower faces ; the second a little wider and 

 pentangular. Distichals two or three. The anterior ray, when with but 

 two arms, has three distichals, the two antero-lateral rays — sometimes also 

 one or both posterior rays — only two, and the upper plate supports two 

 short palmars. In the majority of specimens, both posterior rays have but 

 three arms, and only the distichals next to the anal side bear palmars. The 

 brachials throughout the calyx are provided with a sharp node or short 

 spine ; the plates of the two upper rows are in contact laterally. Arm 

 facets large, lunate, and directed laterally ; the ambulacral openings arranged 

 in groups, the interspaces between the rays being larger than those between 

 their subdivisions. Eespiratory pores large. Arms sixteen to eighteen, 

 stout, rather long, and incurving. Near the calyx they are rounded on the 

 back, but gradually increase as they flatten to twice the diameter at the 

 lower end, and the plates to twice their length. Each alternate plate at 



