396 The Calceocrinidce. 



Heteroerinus incequalis Wachsinuth and Springer, Rev. Palseocrinoidea^ 



Pt. I., p. 70. 

 Cremacrinus inoequalis B. O. Ulrich, 14th Rept. State Geol. Minn., p. 



113. 

 Calceocrinus incequalis Wachsmuth and Springer, Rev. Palaeocrinoidea,. 



Pt. III., p. 282. 



The type specimen lies on a slab and shows only the left side, conse- 

 quently the fourth or posterior arm is obscured. The anterior arm is 

 simple as far as observed, which is about fifteen joints. 



Consolidated basal piece composed of two anterior and two lateral 

 basals. The anterior basals extend to the column by quite strong pro- 

 cesses. 



The lateral arms differ from those of the other Castocrini, in giving 

 off pinnules less frequently and at somewhat irregular intervals, and in 

 not being much enlarged at the points giving rise to them. 



This species differs from C. furcillatiis, in the calyx being more flat- 

 tened anteriorly and depressed along its median portion, also in the 

 larger anterior basals, the proportionately broader first anterior brachial 

 in comparison with anterior radial, and the very fine, closely arranged 

 punctae, which of themselves afford an easy means of recognition. It 

 also differs from the foregoing species in the simple anterior arm, in 

 the method of giving off pinnules, and in the character of the lateral 

 arras. From C. hilling sianus it is distinguished by the surface and by 

 the basals not being anchylosed. 



Trenton formation, Ofctawa, Canada. Type in the Museum 

 of the Geological and Natural History Survey of Canada. 



I am much, indebted to Prof. J. T. Whiteaves, of Ottawa, 

 Canada, of the Geological and Natural History Survey of 

 Canada, who kindly loaned me the types of C. incequalis and C, 

 articulosus, for the purpose of study and comparison. 



CREOT4CRINXJS? Ulrich. 



This genus will belong here, between Castocrinus and Pro- 

 cUvocrinus, if Ulrich^s diagnosis be correct ; but as I have not 

 had an opportunity to examine the type specimen, I will insert 

 it provisionally. 



PROCLIVOCRIXIIS n. gen. 



Bilaterally symmetrical; calyx hanging alongside of the column,. 

 which is curved posteriorly at its upper end. 



Arms three; anterior arm much the largest, simple (?) or not bifur- 

 cating till near the tip; lateral arms increasing by regular bifurcation,, 

 and not giving off pinnules. 



