1886.] NATURAL SCIENCES OF PHILADELPHIA. 146 



PARISOCEINUS W. and Sp., Rev. i, p. 115. 



Closely allied to Eomocrinus is Parisocrinus, which we made 

 a subsection of Poteriocrinus. In doing so, we were not aware 

 that this form is devoid of pinnules. In our descriptions we 

 only pointed out the great resemblance which it has to Gyatho- 

 crimis, especially in the branching of the arms, but finding the 

 azygous side constructed as in Poteriocrinus, we placed it with 

 that genus. More perfect specimens which have since been dis- 

 covered leave not the least doubt that it is very distinct from 

 Poteriocrinus J and a true Cyathocrinoid. 



Revised Generic Diagnosis. General form turbinate. Under- 

 basals large, equal. Basals five, three of them hexagonal; the 

 two connecting with the azygous side heptagonal. The radials 

 are rarely larger than the basals ; four of them are equal, the fifth 

 one has an additional side for the reception of the lower plate of 

 the ventral tube. Articular face horseshoe-shaped, supporting a 

 row of three brachials, of which the upper one is axillary. Arms 

 composed of long slender joints, branching like those of Gyatho- 

 crinus and without pinnules. The azygous side is arranged as 

 in Poteriocrinus, with three plates in the calyx. Yentral tube 

 long, cylindrical, composed of alternately arranged rows of hexa- 

 gonal pieces, with a pore at each angle. Column round. 



Geological Position, etc. Subcarboniferous. America and 

 England. 



We place here Parisocrinus intermedius, P. nereus, P. per- 

 plexus, P. tenuibrachiatus, P. quinquangularis, P. radiatus and 

 P. salignoideus ; but Poteriocrinus curtus, which we referred to 

 it in Pt, I, p. 115, is a Eomocrinus. 



b. Botryocrinites. 



ATELESTOCRINUS, no v. gen. 



'aTc\c(TTOs, incomplete ; Kplvov, a lily. 



PI. 6, fig. 4, and PI. 9, fig. 4. 



We have had, for several years, a very remarkable Crinoid 

 from the Burlington limestone, which could not be placed in any 

 of the established genera. At first we took it to be an abnormal 

 specimen, with only four radials, and a small non-arm-bearing 



