Oct., 1907. New Crinoids — Slocom. 293 



The natural cast is similar in form and proportions to the outside 

 of the calyx without the radial and basal facets. The transverse 

 ridge near the arm bases is more prominent and the inner surface 

 of the plates is slightly beveled towards the edges, so that the position 

 of the sutures is indicated on the casts by indistinct ridges. 



Basals three, two pentangular and equal, the other smaller, quad- 

 rangular. Together they form a cup wider than high and with a small 

 circular base. Radials five, "about equal in size, three pentangular, 

 two quadrangular. The radials are inflected on a line with the lower 

 part of the articular facet forming an obtuse angular transverse ridge. 

 The articular facets are small, occupying about one-third the width 

 of the plates. They are circular in outline with a deep ventral groove. 

 One axillary costal is attached to each articular facet. Column, as 

 indicated by the basal facet, round with a central circular canal. 

 Arms and ventral disc not preserved. 



The type specimen (Mus. No. P 8895) consists of a natural cast of 

 the dorsal cup and the associated natural mold nearly complete. 

 Figures 5 and 6, Plate LXXXVI, are drawn from a rubber impression 

 of the natural mold. This species is so different in its general form 

 from any other species of this genus that comparison seems superfluous. 

 The specific name is proposed in honor of the wife of the writer. 



Locality : Collected by the writer in the Niagaran limestone of the 

 spoil heaps along the Chicago Drainage Canal near Lemont, Illinois. 



Family BATOCRINIDiE. 



HABROCRINUS Angelin. 



Calyx obconical to urn-shaped; composed of thick, more or less 

 ornamented plates. Arms, two to each 

 ray; uniserial, long, heavy and simple 

 throughout. Base monocyclic. 



Basals three, equal. Radials five, 

 each followed by two costals. Distichals 



two to six to each ray leading up to the ^ ^^O^^C^CI/v^. 

 arms. First anal plate large, situated 

 between the two posterior lateral radials. 

 It is followed by three plates in the sec- 

 ond row and five in the third. The anal 

 interradius is much wider than the other 

 interbrachial areas. Fig - 8 " Diagram of mbrocHnus/ 



The genus Habrocrinus together with Pionocrinus was created in 



