34 



EUPACHYCRINUS ASPERATUS. N. SP. 



Body of medium size, basin-shaped, composed of very massive 

 angular plates. Base deeply concave and basals concealed by the 

 column. 



Subradials very massive, projecting outward and downward, 

 slightly excavated below from their outer sides to the point where 

 they join the basals, and forming five prominent angular nodes on 

 which the body would rest when divested of its column. 



Eadials nearly twice as wide as long, four of them pentagonal, 

 the right posterior one quadrangular, and all produced into obtuse 

 nodes or ridges that on three of them extend nearly across the plate, 

 nearer to the lower than the upper margin, leaving a broad, sloping 

 surface between the ridges and the upper margin of the radial plates. 



Brachials one each of the anterior and the antero-lateral rays, 

 shorter and about the same width as the radials, and like them pro- 

 duced into a distinct ridge on their upper margins. 



The right posterior brachial supports two shorter brachials, and 

 these support above two arms each, making four arms to this ray. 

 The left posterior brachial supports an additional brachial on one 

 side, that gives support to two arms, while a single arm is supported 

 on the other side, making three arms to this ray. The other 

 brachials give support to two arms each, making thirteen altogether 

 for this species. The first three or four plates of each arm are quad- 

 rangular, but they soon pass into a series of wedge-formed interlock- 

 ing pieces, gradually becoming narrower toward their extremities. 



Three anal plates are visible, the first is pentagonal, larger than 

 both the others, nodose like the subradials between which it rests, 

 while its upper angle extends a little above the radial on the right. 

 The second anal rests upon the upper truncated margin of the left 

 posterior subradial, and the thifd between the first and second anals. 



Column round and rather small for the size of the body. 



This species is related to Lyons' E. qiiator-decimhrach'udis, but dif- 

 fers in its less massive form, and in the number of its arms. 



Position and locality : Chester limestone, Monroe county, 111. 



Illinois State collection. 



EUPACHYCRINUS MONROENSIS. N. SP. 



Body of medium size, low, basin-shaped, composed of massive 

 plates, 



Basals small, triangular above and below, the inner angles bent 

 downward under the column, and the outer ones bent slightly upward 

 between the subradials. 



Subradials protuberant, sub-hemispheric externally, generally 

 pentangular, the one on the anal side a little larger than the others, 

 and truncated on its upper margin for the support of the anal plate. 



Eadials pentagonal, about twice as wide as long, and truncated 

 entirely across their upper margins for the reception of the radial 

 series. 



