132 FOSSIL CRINOIDS. 



This species has a strong resemblance to Gasterocoma, especially in the large 

 anal opening, with a plate above it. I have given for comparison one of 

 Schultze's figures of G. antiqua with a similar plate above the anus, and others 

 around it, doubtless forming the base of a small anal protuberance. 



Type. The type specimen is in the author's collection. 



Horizon and Locality. Hamilton Group, Middle Devonian. Stated in 

 the original description to be from Charleston, Clark county, Indiana, on 

 the authority of Dr. Knapp's label; but more probably from the Beargrass 

 quarries, near Louisville. 



SCHULTZICRINUS, gen. nov. 



An Inadunate, dicyclic Crinoid. Infrabasals coalesced. Anus directly 

 through the dorsal cup, below level of arm bases. Radial facets horseshoe- 

 shaped, concave. Rays perforated by dorsal canal. Arms five, uniserial, 

 simple. Pinnules absent. Column rountl. 



Genotype. Schultzicrinus typus, sp. nov. 



Distribution. Middle Devonian. America. 



The name is given in memory of Ludwig Schultze, whose Monograph of 1866 

 is by far the richest contribution to the literature of the Devonian Crinoids ever 

 made. 



Except for the difference in arms, the above diagnosis would be interchange- 

 able with that of Arachnocrinus; this difference is similar to that between 

 Synbathocrinus and Cyathocrinus. The arms continue directly from the radials 

 without bifurcation, and their component brachials are flat and elongate, instead 

 of round and short. In the fact of not branching they are similar to the arms of 

 Myrtillocrinus, but otherwise their structure is very different, and the lack of 

 an anal opening through the cup would distinguish that genus from this at once. 



Schultzicrinus typits, sp. nov. 



Plate III, figs. 1-6. 



Calyx rather small, depressed hemispheric, wider than high; widest at 

 upper angle of basals, contracting above that. Base truncate; infrabasal disk 

 large and distinct; axial canal usually quadripartite, with large central opening 

 and four smaller ones surrounding it. Anus rather large, encroaching on pos- 

 terior basal; posterior radials meeting above it, without intervening plate, so 



