INDIANA PALEONTOLOGY. »40. 



thirty millimeters in diameter, very fine, and equal in size at the margin, alter- 

 nating below, the short ones continue to the bottom of the cup, and gradually 

 disappear, the longer ones continue to the center of the calix, coalescing with 

 the adjacent ones, and terminates, leaving the bottom flat. Fossette consists of 

 a. deep depression near the center of the calix, and continues to the anterior 

 margin. Denticulations are very fine, they are not seen in only well preserved 

 examples. The exterior is strongly marked with annular lines of growth. 

 The epitheca is strong, and comparitively smooth. 



Found in the Upper Devonian (Hamilton group) in the strippings above 

 the cement rock, at the different cement quarries throughout Clark county, 

 Indiana. The examples illustrated are in my collection. 



DOLATOCRINUS NODULIFERUS, N. Sp., (Rowley) 



Plate 41. Figs. 1, 2, 3. 



The region of the basal plate is a little concave. 



The upper stem joints fill the funnel with scarcely an appearance of a rim. 



The hexagonal first radials have a strong central wart-like node each or a 

 cluster of smaller tubercles. 



The quadrangular second radials have each a strong central node. The 

 third radials have either a single node or a cluster of nodes. The higher radials 

 iiave clusters of tubercles. 



A radial ridge begins at the node on the second radial plate and passes up- 

 ward to the arm bases, forking twice. This ridge is not strong. 



The large first interradials have each either a cluster of small tuburcular 

 nodes or a large node surrounded by smaller ones. The two or more higher in- 

 terradials have groups of nodes. From the centers of two of the first interra- 

 ■dials radiating lines pass. to the sides of adjacent plates. 



There are apparently sixteen arm bases, one ray being injured. Three to 

 the ray except in one, which has four. 



The arm lobes are strong. The anal tube is nearly central and strong. 

 The ornamentation of the ventral disk is tuburcular nodes, small and sparingly 

 scattered over the whole surface. 



The ambulacral ridges or folds are strong. 



The peculiar mixed ornamentation will serve to distingaish this species. 



From the Upper Devonian, near Charlestown, Ind. 



Collection of Mr. G. K. Greene. 



