166 PROCEEDINGS OF THE ACADEMY OF [1886. 



the apposed faces, more or lefes parallel and flat, angular or 

 rounded on their outer face. The arms dichotomize and each 

 branch gives otf one or more branches to the inner side of the 

 ray, which either bifurcate again or remain simple. The articu- 

 lation is the same as in Scaphiocrinus. Column circular, or 

 obtusely pentangular. 



The zoological position of Woodocrinus is probably between 

 Scaphiocrinus and Zeacrinus. 



Geological Position, etc. The genus occurs only in the Subcar- 

 boniferoiis, and almost exclusively in the lower portions. 



We place under Woodocrinus the following species, all of which 

 were referred by us. Rev. i, p. 116, to Pachylocrinus : Zeacr'inus 

 arboreus Worthen, Zeacrinus asper M. and W., Zeacrinus concin- 

 nus M. and W., Poteriocrinus latifrons Austin, Scaphiocrinus 

 liliiformis M. and W., Zeacrinus merope Hall, Zeacrinus paternus 

 Hall, Zeacrinus perangulatus White, Zeacrinus planobrachiatus 

 M. and W., Pachylocrinus suhsequalis W. and Sp., and the follow- 

 ing, which in Rev. i, p. 128, were placed under Zeacrinus : Pot- 

 eriocrinus hursaeformis White, Zeacrinus elegans Hall, Zeacrinus 

 ramosus Hall, Zeacrinus scohina M. and W., Zeacrinus serratus 

 M. and W., and Zeacrinus troostanus M. and W. 



The following species are to be added : 



*1882. Woodocrinus asperatus (Worthen), Poteriocrinus asperatus, Bull, i, 111. St. 

 Mus. Nat. Hist., p. 12, also Geol. Rep. Illiuois, vii, p. 280, Pi. 28, fig, 2. 

 Keokuk limest. Keokuk, la. 



*1882. W. claytonensis (AVorthen), Poteriocrinus claytonensis, Bull, i, 111. St. Mus. 

 Nat. Hist., p. 18; also Geol. Rep. lUinuis, vii, p. 288, PI. 30, fig. 6. War- 

 saw limest. Adams Co., 111. 



1862. (?) W. cometa (De Koninck), Philocrinus cometa, Quart. Journ. Geol. See. 

 London, PI. ii, fig. 1. Suboarboniferous. River Indus, India. 

 1854. W. macrodactylus De Koninck. Type of the genus, Recherch. Crin. Belg., 

 Suppl., p. 6, PI. 8, figs. 1 a-d. Suboarboniferous. Richmond, England. 



*1882. W. richfieldensis (Worthen), Poteriocrinus richfieldensis, Bull, i, HI. St. 

 Mus. Nat. Hist., p. 15; also Geol. Rep. 111., vii, p. 285, PI. m, fig. 5. 

 Waverly (Kinderhook) group. Richfield, 0. 



188.3. W. tentaculatus (Worthen), Poteriocrinus tenuidactylus. Bull., i, III. St. 

 Mus. Nat. Hist., p. 10 ; Poteriocrinus tentaculatus, Geol. Rep. Ilinois, vii, 

 p. 277, PI. 28, fig. 11. Keokuk limest. Keokuk, la. Prof. AVorthen finding 

 the former specific name occupied, changed it to the latter. This species is 

 a typical form of Woodocrinus, and has the heavy rounded arms as De 

 Koninck's species. 



