528 PALEONTOLOGY OP ILLINOIS. 



EUPACHYCRINXJS Bassetti, Worthen. 



PI. 32, Tig. 2. 



Body large, sub-hemispherical, width about once aud a half as much 

 as the hight. Base small, depressed, with the basal plates hidden by 

 the columnar facet. Subradials large, hexagonal so far as can be seen 

 from the examples under examination, length and breadth nearly equal, 

 and curving into the basal concavity below. First radials about ouce 

 and a half as wide as high, pentagonal ; second radials as wide as the 

 first, less than half as high, except one on the anal side, which is about 

 three-fourths the hight of the first radial on which it rests, and more 

 decidedly pentagonal than the others, aud all supporting on their mar- 

 gins two nearly quadrangular brachial pieces that support the arms. 

 One anal plate only is visible, about twice as high as wide, apparently 

 hexagoual, resting partly on two of the subradials, and extending 

 upward nearly or quite as high as the upper lateral angles of the second 

 radials, and curved inwardly at its upper extremity. Arms, four on the 

 two posterior rays, and apparently but two on the others, though the 

 anterior side is but partially seen in our specimens, composed of rather 

 short stout plates, the first ones single, but soon merging into a double 

 series of short interlocking pieces, that decrease very gradually in width 

 towards the upper extremities of the arms. The entire surface of the 

 body and arms ornamented with numerous irregularly disposed wart- 

 like prominences, giving to it a very strongly marked verrucose appear- 

 ance. 



Column slender, and composed of round alternating thin aud thicker 

 joints, the latter a little projecting, with numerous lateral appendages, 

 or side arms, composed of small, rather thick round joints, connected 

 by strongly creuulated sutures. 



This species is nearly related to the one described by Messrs. White 

 and St. John, iu the Trans. Chicago Acad. Sci. Vol. I, page 117, under 

 the name Hydreinocrinus ? verrucosus, but differs from that in its more 

 robust form, in not having the margins of its body plates beveled, in the 

 form of its anal plate, and in its somewhat different style of ornament- 

 ation. 



Position and locality : Same as the last. Dedicated to Dr. G. W. 

 Bassett, of Vandalia, to whom I am indebted for the use of one of the 

 examples figured, as well as for liberal contributions of interesting fos- 

 sils from Fayette county, and for many acts of personal kindness and 

 attention. 



