NATURAL SCIENCES OF PHILADELPHIA. 343 



radials a little longer than the next below, and generally trigonal or subpen- 

 tagoaal (the upper angle being somewhat salient), and supporting the arms on 

 its sloping sides. Arms rounded, rather divergent, and bifurcating on the sixth 

 or seventh piece above their bases, and again once or oftener farther up, the 

 divisions above each bifurcation being about half as large as the main arm 

 below ; arm-pieces about twice as wide as long, not wedge-shaped, but all 

 showing the downward curvature quite distinctly, and slightly constricted on 

 each side. Surface merely finely granular, and the plates of the body neither 

 beveled nor tumid. Column composed of such thiu pieces that about fifteen of 

 thera may be counted in a length equaling its own thickness, near the base. 



Height of body of the largest specimen to top of first radials, about 0-43 inch ; 

 breadth near 1 inch. 



Thickness of column of same, near base, 0-20 inch ; diameter of its subpen- 

 tagonal caual, 0-05 inch. 



This Crinoid is so unlike all others known to us, that it is scarcely necessary 

 to compare it with any of the described forms. The specific name is given in 

 honor of Mr. Charles Wachsmuth, the author of the genus, to whom we are in- 

 debted for the loan of the typical specimens. 



Locality and position. — Upper Burlington beds of the Lower Carboniferous. 

 Burlington, Iowa. 



Mr. Wachsmuth's collection. 



Genus CATILLOCRINUS, Troost. 

 Catillocrinus Bradleyi, M. and W. 

 Body small, basin-shaped or rather broadly truncated below for connection 

 with the column, and moderately expanding upward to the top of the radials 

 supporting the arms. Lower series of plates visible around the top of the 

 column, anchjiosed together, and presenting the form of a broad low dish 

 many times wider than high, with the margins sinuous above for the reception 

 of the next range of pieces. Succeeding range of plates presenting the usual 

 irregular form of the genus, two of them being much larger than the others, 

 very wide at the top, and supporting nearly or quite all of the arms ; between 

 these on one side there is a much smaller triangular piece on the same range, 

 and extending up as high as the others, but so narrow at the top that it could 

 not have supported more than one or two, if any, of the small arms. On the 

 opposite side there are two other small intercalated pieces, the smaller of which 

 is triangular and scarcel^^ extends up to the top of the cup, while the other is 

 oblong, extends to the top of the cup, and supports either another somewhat 

 smaller (anal ?) piece above, or the base of an arm much larger than the others. 

 Arms about 44, in contact at their bases, and all slender and composed of 

 joints two or three times as long as wide. Surface smooth. Column compara- 

 tively very large (circular?), with a large round central canal, and composed 

 near the base of rather thin pieces of uniform size. 



Height of body, 0-18 inch; breadth at top, 24 inch ; breadth of column at 

 the base of the body, 0-13 inch. 



This species will be at once distinguished from ('. Tetmesse.ex of Troost by 

 its much smaller size, and smooth instead of coarsely granular plates. It is 

 much more nearly allied to our 0. Wachsmuthi, from the Burlington group, but 



.'body is less expanded at the top, and it also differs in having a compara- 

 tivel}^ large anal ? piece, or larger arm, between the others on one side. Named 

 in honor of Prof. Frank H. Bradley, of Hanover College, late of the Illinois 

 Geological Survey, who discovered the only specimen known. 



Loculiti/ and position. — Crawfordsville, Indiana ; Keokuk division of Lower 

 Carboniferous series. 



Genus DICHOCRINUS, Munster. 

 DicHOCRiNus EXPANSus, M. and W. 

 Body expanding rather rapidly from the facet for the attachment of the col- 



1868.] 



