The GalceocrinidcB. 399 



two joints, at the second of which a bifurcation takes place, and again 

 at the fourth joint above that. 



What were described as lateral armlets in the anterior arm of the 

 type specimen were found, upon further cleaning, to be portions of the 

 lateral arms lying beneath and projecting out from under it, and not 

 from its sides as first supposed. 



Column round, smooth, consisting of joints as high as wide, except 

 the last five or six proximal to the calyx, which rapidly get shorter 

 and are higher on the outer side of the column, giving a strong curva- 

 ture at this point, which still further facilitates the maintenance of the 

 drooping position of the calyx. 



The median antero-posterior elevation of the last joints, constitutes a 

 marked somewhat saddle-shaped flexure in the last four; which flexure 

 is received in a corresponding notch in the anterior margin of the 

 articular facet. 



Proclivoerinus chrysalis Hall. 

 PI. X., Figs. 2 and 13. 



Chierocrinus chrysalis Hall. 13th Eept. N. Y. State Cab. Nat. Hist., 



p. 123. 

 Calceocrinus chrysalis Shumard. Trans. Acad. Nat. Sci. St. Louis, 



Vol. II., p. 538, 1886. 

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



Minn., p. Ill, 1886. 

 Calceocrinus chrysalis Wachsmuth and Springer. Rev. Palseocrinoidea, 



Pt. III., p. 281, 1886. 



This species agrees with P. radiculus in the general outline and rela- 

 tions of the plates to each other, but is distinguished by the much 

 broader calyx; calyces corresponding in height being at least a third 

 broader, and also usually less contracted in the middle, than is the 

 case with P. radiculus. Hall figures his types as having an anchylosed 

 anterior basal in which the points do not extend to the column. This 

 point, however, is usually so obscure that in all probability it was over- 

 looked in this case, as it has been in others; the same remark will apply 

 to the construction of the posterior side, — as two individuals from the 

 same locality as Prof. Hall's specimens agree very well in other respects 

 with his descriptions. Should the diagram, however, prove to be cor- 

 rect, the specimens here referred to will have to fall under another 

 designation. 



This species is readily distinguishable, — as before stated, — from P. 

 radiculus, by the much wider calyx and consequently broader plates; 

 this is especially noticeable in the case of the posterior radials. 



A unique specimen showing both the articular joint with its connect- 

 ing ligaments, and the vault, — perfectly, — will furnish all that can be 

 added to the descriptions already published. 



