398 The Calceocrinidce. 



Cremacrinus radiculus E. O. Ulrich. 14th Annual Rept. State Geol. 



Minn., p. Ill, 1886. 

 Calceocrinus radiculus Wacbsmuth and Springer. Rev. Palseocri- 



noidea, Pt. III., p. 282. 



Consolidated basal piece strongly rounded at the point of juncture 

 with the column, where it is of the same shape and size as the column, 

 from which point it spreads out evenly to the flattened anterior margin. 

 This plate is sometimes corrugated, the rugae passing across it in an 

 antero-posterior direction. 



Articular margin furnished with a deep, sharp, ligament-bearing 

 groove. 



Lateral basals not forming an incurved margin underneath the 

 column, but only united in the posterior part of the columnar facet, 

 and divided anteriorly by the slender apices of the anterior basals. 

 Anterior basals high, and occupying about one-half of the anterior 

 articular margin of the piece. They taper very rapidly for about one- 

 half of their height, from which point they are prolonged into attenu- 

 ate processes, extending up to and forming a part of the columnar 

 facet. 



Anterior radial high, very narrow, rather abruptly constricted near 

 the middle to one-half of the width of the basal end, which narrowing 

 is continued throughout the brachial half. 



Ends of the lateral processes of the lateral radials resting against and 

 as wide as the turned-up portion of the lateral arms of the azygous 

 plate. Posterior radials narrow, with all three sides convex, and the 

 side next to the azygous much shorter than the others. 



Azygous plate with the ends of the lateral arms of the plate turned 

 up so as to clasp the base of the anal plate between them. 



Posterior plates of anal tube large, quadrangular, and very gradually 

 tapering with the tube; slightly arched posteriorly; but three plates 

 have been seen above the azygous plate. 



The five radials, the azygous, and the anterior brachial, seem to be 

 generally consolidated into a single piece, some of the suture-lines being 

 sometimes almost obliterated. These plates are at times also somewhat 

 corrugated, the general direction being transverse. 



Specimens vary from those with a strongly rugose surface to those in 

 which it is smooth. 



Anterior first brachial just as high as the notch between the upper 

 angles of the lateral radials; second arm-joint tapers more rapidly than 

 the rest. The anterior arm bifurcates at the ninth joint, above which 

 four slender, tapering joints can be counted without further bifurcation. 



The lateral arms have two brachials, the second of which is axillary; 

 the anterior division bifurcates again at its third joint, and the lower or 

 posterior undergoes two bifurcations, one at each succeeding fourth 

 joint. Upper division unknown. The posterior primary branch has 



