The CalceocriniclcB. 405 



laterally to the outer angles. Articular facet for column situated a 

 little inside of the margin, and with its face directed posteriorly. 



Associated with the base just described, we find the anterior portion 

 ■of a calyx that undoubtedly belongs to the same species. Anterior 

 portion of calyx slightly but evenly arched from side to side, lower side 

 wide, rapidly and evenly tapering to the insertion of the anterior 

 brachial, which extends some distance beyond the upper angles of the 

 lateral basals, and tapers more sharply than they do, thus giving the 

 upper portion of the calyx a contracted appearance. Anterior radial 

 broad and low, and extending to the outer angles; thus corresponding 

 in size and proportions to the anterior consolidated basal. Anterior 

 brachial extending for more than half of its height beyond the lateral 

 radials; pentagonal in outline, and wider than high. 



From the lower portion of the Niagara Limestone at Lock- 

 port, N. Y. 



The consolidated basal piece of this species is distinguished 

 from that of G. halli of the underlying shales by the much 

 greater proportionate antero-posterior diameter, and by the po- 

 sition of the point of attachment, which is situated nearer to 

 the posterior margin, and has its articular facet directed more 

 nearly posteriorly. 



Remarks: The genus Cremacrlnus of Mr. E. 0. Ulrich is 

 probably the only one of his genera which will hold good. Its 

 pinnulate lateral arms, the punctate surface of the plates, and 

 the sinuous border along the outer margin of the articulation, 

 ally it to Castocrinus ; while in its having only three arms, 

 and in the arrangement of the plates on the ventral side, it 

 would closely approach ProcUvocrimis ; so that its natural 

 position would be between those two genera. The features dis- 

 tinguishing it from its closest ally ProcUvocrinus would be 

 those already pointed out as allying it to Oastoct'inus, together 

 with a shorter and broader anterior radial than in Froclivocri- 

 mis, and in the anterior basals not extending to the columnar 

 facet. 



I speak of the anterior arm as '' simple (?)" because I believe 

 that all, or ne.arly all, the species which have been described as 

 having a simple anterior arm, will be found to show a bifurca- 

 tion, in case specimens are found preserving the arm to its tip. 



The plate which is termed the '^azygous," in the foregoing 

 descriptions, may prove to be the first anal, and probably in 



