* 



1886.] NATURAL SCIENCES OF PHILADELPHIA. 169 



In its arm structure Cceliocriniis leans decidedly toward Woodo- 

 crinus, but approaches Eydreionocrinus in the form of its sac- 

 like appendage. 



We have already referred to it Cceliocrinus dilatatus (Hall) 



White; G. carr/u/erMS (Worthen) W. and Sp.; G. lyra (Worthen) 



W. and Sp. ; G. subspinosus White, and G. ventt^icosus (Hall) 



White, and now add further : 



1840. C. tessellatus (Phill.), Spseronites tesseUatus, Pala^oz. Foss. Cornwall, p. 

 135, PI. 59. Subcarbon. (?). Locality (?). 



HYDREIONOCRINUS De Kon., Rev. I, p. 123. 



Wetherby, in a paper on the Crinoids of Pulaski Co., Ken- 

 tucky, figured and described a new species of Eydreionocrinus, 

 which he referred with doubt to Eydreionocrinus (Zeacrinus) 

 armiger (M. and W.). Several fine specimens of this form, which 

 we obtained lately at Sloan's Yalley, Ky., show it to be specifically 

 distinct from either E. armiger or E. de23ressus of the same 

 localit3^ We propose for it the name Eydreionocrinus Wether- 

 byi, in honor of the discoverer of this interesting locality. The 

 species, which was figured Journ. Cincin. Soc. Nat. Hist., vol. iii, 

 figs. 7, 8, 9, 10, difiers from E. depressus, y^ith which it has prob- 

 ably the closest aflfinities, in the less depressed form of the dorsal 

 cup, and in the basal concavity, which is shallow and almost re- 

 stricted to the underbasals ; while in the other the cup is deeply 

 excavated, and the concavity includes even a portion of the 

 radials. In our species, every brxichial bifurcates, in the other 

 only four ; the anterior radial which is quadrangular, supporting 

 a single primary arm. In the former all five radials are spinifer- 

 ous, in the latter only four, and the spines are shorter and sharper. 

 In E. depr^sus the primary arms branch four times, in E. 

 Wetherbyi only twice, and the arms, which in the former taper to 

 a small point, remain comparatively heavy in the latter. Again, 

 in E. depressus the arm joints, from the second bifurcation up- 

 wards, are biserial, while in E. Wetherbyi they do not pass the 

 interlocking stage. In the former the ventral sac is armed with 

 ten spines which join along the centre, the latter has five only, 

 and these enclose a variable number of small plates. 



Eydreionocrinus (?) orbicularis De Koninck will be found 



under Cromyoci'inus. 



*1884. H. Wetherbyi W. and Sp. Hydreionocrinus (Zeacrinus) arminger (M. & 

 W.) Wetherby, Journ. Cincin. Soc. Nat. Ilist., iii, p. 5, figs. 7-10. Kaskas- 

 kia gr. Pulaski Co., Ky. 

 12 . 



