NATURAL SCIENCES OF PHILADELPHIA. 89 



Radial pieces nearly equaling the entire length of the body, and divided 

 almost to their base by the pseudo-ambulacral areas, each with a broad deep 

 sulcus extending up on each side of the pseudo-ambulacral areas, the entire 

 length ; while between this sulcus and each lateral margin, the surface swells 

 out into a broad rounded ridge, widest near the middle of the body and nar- 

 rowing upward and downward, these ridges on each two contiguous pieces 

 being separated by a deeply sulcated suture. Interradial and anal pieces very 

 small, subtriangular or cuneate-quadrangular, only about one-sixth the length 

 of the body, measuring over the curve of the sides. Pseudo arabulacral areas 

 very narrow or sublinear, with sides parallel, equaling the entire length of the 

 body, slightly impressed above, but quite as prominent as the immediate 

 margins of the radial pieces on each side below, if not wider; pore pieces 

 about fifty on each side of the mesial furrow; supplementary pore pieces 

 unknown ; lancet pieces apparently not exposed externally. Openings of the 

 summit small, but not clearly seen in the specimen. 



Body of the typical specimen 0-45 inch in height; breadth, 0-5 inch. 



The surface of the typical specimen of this species is not well enough pre- 

 served to show fine markings, but another individual of apparently the same 

 species shows the lower half of the radial pieces to be ornamented with rather 

 fine granules, so arranged as to look like fine transverse strife under a magni- 

 fier, while a few stronger longitudinal strife are also seen on this part of the 

 body. In this specimen, however, the surface of the radial pieces is less con- 

 vex between their lateral margins and the broad sulcus on each side of the 

 pseudo-ambulacra, than in the typical form. 



In form and the narrowness of its pseudo-ambulacra this species reminds 

 one of G. Sayi, of Shumard, but it is at once distinguished by the very much 

 larger anal and interradial and shorter radial pieces of that species, as well as 

 by the canaliculate character of the sutures between the latter, with a rounded 

 ridge on each side of this suture. In the comparative size of its radial and 

 interradial pieces, as well as in the canaliculated sutures between its radial 

 pieces, it agrees more nearly with G. melo, of 0. and S., but is not only distin- 

 guished from that species by its subglobose form (a little wider than long) and 

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

 ambulacral areas below the middle of the body, and deep broad rounded sulci im- 

 mediately 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. Wachsmuth's collection. 



Granatocrinds pisum, M. and W, 



Body small, oval — subglobose, being slightly longer than wide. Base very 

 small, rather deeply concave, and distinctly pentagonal in outline. Radial 

 pieces long, truncato-subelliptical in general outline, with tlie lower end nar- 

 row, 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 downward; all quite as convex as the slightly raised linear margins 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 downward ; 



1869.] 



