356 PROCEEDINGS OP THE ACADEMY OP [18? 9- 



The following species may be arranged here, though we rather 

 prefer their consolidation with Hydreionocrinus. 



1861. Coeliocrinus dilatatus Hall. (Poteriocr. dilatatus), Descr. New Pal. Crin., 

 p. 6; Bost. Journ. Nat. Hist., p. 300. White, 1863, Caliocr. dilatatus, 

 Bost. Journ. Nat. Hist., p. 501. Lower Burlington limest. Subcarb. Bur- 

 lington, Iowa. 



1873. Coeliocr. cariniferus Worthen. (Zeacr. cariniferus), Geol. Rep. Illinois, 

 vol. v. p. 535, pi. 20, fig. 4. (?) St. Louis limest. Near Huntsville, Ala. 



* 1869. Coeliocr. lyra Meek and. Worthen. (Zeacr. lyra), Proceed. Acad. Nat. Sci. 

 Phila., p. 152; Geol. Rep. Illinois, vol. v. p. 432, pi. 1, fig. 11. Upper 

 Burlington limest. Subcarb. Burlington, Iowa. 



1863. Cosliocr. subspinosus White. Bost. Journ. Nat. Hist., p. 501. Upper Bur- 

 lington limest. Subcarb. Burlington, Iowa. 



1861. Cosliocr. ventricosus Hall. (Poteriocr. ventricosus), Descr. New Pal. 

 Crin., p. 6; Bost. Journ. Nat. Hist., p. 301. White, 1863, Caliocr. ventri- 

 cosus, Bost. Journ. Nat. Hist., p. 501. Lower Burlington limest. Subcarb. 

 Burlington, Iowa. 



19. EUPACHYCRINUS Meek and Worthen. 



1855. Eupachycrinus, Proc. Acad. Nat. Sci. Phila., p. 159. 



1866. Geol. Rep. 111., vol. ii., p. 177. 



1867. Cromyocrinus Trautschold. Crin. jiing. Bergkalkes bei Moskau, p. 



19. 

 1879. Cromyocrinus, Monogr. Kalkbriiche von Mjatsclikowa, p. 117. 



Meek and Worthen proposed the name Eupachycrinus, without 

 generic description, for a small group of American Crinoids, which, 

 by their massive, tumid plates, the double series of interlocking 

 plates generally composing the arms, and their general phj-siog- 

 nomy, are well distinguished from all other known genera. The}'- 

 made Lyon's Graphiocrinus quatuor decimbrachialis the type of 

 the genus, including in it Hall's two species Cyathocrinus (?) 

 pentalobus and Scaphiocrinus orbicularis, and have since described 

 several new species. 



In 1867 Prof. Trautschold, not knowing that such a genus had 

 been established, proposed the name Cromyocrinus for two 

 species from the Upper Subcarboniferous of Russia, 1 which in 

 many respects, if not altogether, agree with those upon which 

 Eupachycrinus was founded. The species of both agree in the 

 bowl-shaped, sometimes nearly globular form of the calyx, its 

 comparatively very large size, its large and heavy plates, the 



1 We are under obligations to Dr. Trautschold for some excellent Cri- 

 noids from the Russian beds, and to Prof. Wetherby, of Cincinnati, for the 

 loan of some rare and well-preserved specimens of Eupachycrinus. 



