470 PALEONTOLOGY OF ILLINOIS. 



instead of concave base, but by its much more prominent pseudo-am- 

 bulacra! areas below the middle of the body, and deep, broad, rounded 

 sulci immediately on each side of these, and swollen surface between 

 these sulci and the canaliculated suture separating the radial pieces. 

 It moreover comes from the upper division of the Burlington group, 

 while the vastly more common G. melo is only found in the lower beds. 



Locality and position Upper beds of Burlington group, Burlington, 

 Iowa. Lower Carboniferous. No. 398 of Mr. WACHSMTJTH'S collec- 

 tion. 



GRANATOCRINUS PISUM, M. and W. 



PI. 9, Fig. 4. 

 Granatocrinus pisum, MEEK and WOKTHEN. Proceed. Acad. Nat. Sci., Phila., 1869, p. 89. 



BODY small, oyal subglobose, being slightly longer 

 than wide. Base very small, rather deeply concave, and 

 distinctly pentagonal in outline. Radial pieces long, trun- 

 cato-subelliptical in general outline, with the lower end 

 narrow, forming a nearly flat surface across between the 

 pseudo-ambulacral fields, excepting below the middle, 

 where these surfaces are concave; all divided nearly to 

 their very bases by the pseudo-ambulacra, and without 

 even the faintest trace of a furrow along up the sutures 

 between their lateral margins. Interradial and anal pieces 

 strongly incurved above, cuneate-subtrigonal in form and 

 longer than wide, the length being about one-fourth that 

 of the whole body, measuring over the curve of the sides. 

 Pseudo-ambulacra narrow, or sublinear, with very nearly 

 parallel sides, there being a slight taper from above down- 

 ward ; all quite as convex as the slightly raised linear mar- 

 gins of the radial pieces on each side; pore pieces about 

 twenty-six on each side of the distinct mesial furrow, along 

 which their inner ends are minutely crenate, comparatively 

 rather large, and ranging obliquely outward and down- 

 ward; supplementary pore pieces unknown; lancet pieces 

 apparently not visible externally, unless it is along the bot- 

 tom of the mesial furrow. 



