NATURAL SCIENCES OF PHILADELPHIA. 91 



legs, upon which the body stands when placed an an even surface, as in the 

 last. 



We have seen five specimens, all of which agree in the characters given. 



Locality and position. — Lower division of the Burlington group, at Burlington, 

 Iowa. Lower Carboniferous. No. 396 of Mr. Wachsmuth's collection. 



Granatocrinus olaber, M. and W. 



Body very small, pentagonal-subglobose, being somewhat wider than long 

 and rather broadly truncated below, with the spaces between the rather promi- 

 nent pseudo-ambulacral areas almost flat near the middle, and more or less 

 concave below. Base about even with the most prominent part of the lower 

 ends of the radial pieces, nearly flat, and very distinctlj' pentagonal, or almost 

 pentapetalous in outline. Radial pieces forming about three-fourths the actual 

 height of the body, abruptly incurved below to connect with the base, and all 

 divided quite to the lower side of the body by the pseudo-ambulacral areas. 

 Interradial pieces of moderate size, or about one-third as long as the body, 

 measuring over the curve of the sides from their upper ends to the base ; 

 triangular in form and nearly as wide as long, all strongly incurved above ; 

 anal piece shorter than the interradials below the anal opening. Pseudo- 

 ambulacral areas rather narrow, tapering slightly from above, and nearly as 

 convex as the margins of the radials on each side. Pore pieces about twenty- 

 five to thirty on each side of the mesial furrow of each area ; supplementary 

 pore pieces unknown ; lancet pieces apparently not showing externally. 

 Summit depressed in the middle ; central and anal openings comparatively 

 rather large ; so-called ovarian pores of moderate size, situated one on each 

 side of the inner end of each interradial piece, and of course two others as 

 usual opening into the anal aperture. 



Surface apparently quite smooth, even as seen under a magnifier, but proba- 

 bly when entirely unworn, marlied by microscopic longitudinal strife. 



Height of one of the largest specimens, 0-21 inch; breadth, 0-23 inch ; breadth 

 pseudo-ambulacral areas, 0-04 inch ; do. of spaces between the same, at the 

 widest part, 0-13 inch. 



This little species is so very clearly distinct from all others known to us, that 

 it is unnecessary to compare it with any of those yet described. Its most 

 characteristic features are its small size, smooth surface, flat space between the 

 pseudo-ambulacral areas, and nearly even pentapetalous base. 



We have before us nine specimens, of various sizes, all agreeing in the char- 

 acters given excepting one, which, from abnormal development, has only four 

 pseudo-ambulacral areas. As this agrees with the others, however, exactly, 

 in all its specific characters, it is evidently a monstrosity of the same species, 

 produced by the non-development of one of the radial pieces, by which means 

 two of the pseudo-ambulacral fields are, as it were, welded together, to form 

 one larger than any of the other three. 



Locality and position. — Saint Louis division of the Lower Carboniferous 

 series, in Hardin County, Illinois. 



May Uh. 

 Jos. Jeanes in the Chair. 

 Twenty-seven members present. 

 The following paper Avas presented for publication : 

 " A review of the species of Plethodontidse and Desmognathidse." 

 By E. D. Cope. 



Mr. J. H. Redfield stated that on the 22d of April, in company with Mr. C. 

 F. Parker, he had visited Cedar Bridge, Ocean Co., N. J., in search of Corema 

 Conradii. This plant occurs in Newfoundland, on islands near Bath, Maine, 



1869.] 



