408 PALEONTOLOGY OF ILLINOIS. 



rounded, comparatively rather stout, composed of joints 

 two or three times as long as wide, and owing to the length 

 of the arm-pieces, widely separated from each other. Col- 

 umn of moderate thickness, and apparently showing a ten- 

 dency to assume a pentagonal outline near the base. 



Hight of body to the top of first radial pieces, 0.10 inch ; 

 breadth of do., 0.15 inchj length of arms, about 0.75 inch. 



This very delicate little species is nearest like that we have already 

 described under the name 8. nanus, but will be readily distinguished by 

 its much more slender second radial pieces and arms. This narrowness 

 of the second radials causes the inter veiling spaces tobe wider than the 

 second radial pieces themselves ; while in the 8. nanus these pieces are 

 so wide as to be in contact "with each other all around, excepting on the 

 anal side. These differences give to each of these two forms more 

 strongly marked distinctive features than would probably be apparent 

 from merely reading the descriptions without seeing the fossils them- 

 selves. 



Locality and position Upper division of the Burlington group, at Bur- 

 lington, Iowa. Lower Carboniferous. No. 297 of Mr. WACHSMUTH'S 

 collection. 



SCAPHIOCRLNTJS OLIO, M. and W. 



PL 1, Fig. 10. 

 Scaphiocrinus Clio, MEEK and WOKTHEN. Proceed. Acad. Nat. Sci., Phila., 1869, p. 144. 



BODY inversely subcampanulate, somewhat truncated or 

 more or less rounded to the column below, and a little ex- 

 panded at the top of the first radials, where it is nearly 

 twice as wide as high. Base very small, or almost entirely 

 hidden by the column, not projecting below the horizon of 

 the next range of pieces. Subradial pieces slightly tumid, 

 and owing to the small size of the base forming most of 

 the under side, as well as half of the hight of the body, a 

 little longer than wide, and all (excepting probably one or 

 two not seen on the anal side) presenting a general pentag- 

 onal outline, there being no visible angle at the middle of 

 the under side in any of them. First radials larger than 



