362 PROCEEDINGS OF THE ACADEMY OP [1879. 



of the calyx, as in the large size of the underbasals, which are the 

 only characters upon which a separation under Cromyocrinus 

 might be based ; but in that case what shall be done with Evp. 

 crassus, which has the same form and very small underbasals ? 



*1867. Eupachycr. simplex Trautsohold. (Cromyocr. simplex) Crin. jiing. Berg- 

 kalk, p. 19, pi. 3, figs. 1-4; also 1879. Kalkbriiche von Mjatschkowa, p. 117, 

 pi. 14, figs. 6-8. Citpressocr. nuciformis Golcffuss. Oryctographia b. 

 Fisher, p. 151, pi. 41, figs. 5, 6 ; Fisher, Poteriocr. nuciformis Lethaea 

 Rossica i., p. 588 ; also Quenstadt. Petref. Deutschland, iv. p. 543, pi. 109, 

 fig. 6. Upper Subcarb. Near Moscow, Russia. 



The small specimens which Trautschold has figured, and consid- 

 ered to be the young of Cromyocr. simplex, represent a very dis- 

 tinct species. In a specimen which we recently obtained from 

 Prof. Zittel, the brachials in two raj's are preserved, and show 

 plainly that they are bifurcating plates, while Gr. simplex has 

 but five arms. The specimen was labelled Zeacrinus new sp. We 

 agree with Prof. Zittel that the calyx resembles that genus closely, 

 but we doubt if it has more than ten arms. The length of the 

 brachials and their form point rather to Poteriocrinus (Scytalo- 

 crinus), from which it differs in the shortness of the calyx. It 

 evidently must be arranged with Pot. (Scylalocrinus)? manifor- 

 mis, or as a transition form of Eupachycrinus. 



*1867. Eupachycr. subtumidus Worthen. (Zeacr. suhtumidus). Geol. Rep. 111., 



vol. v. p. 548, pi. 21, fig. 1. Chester limest. Subcarb. Pope Co., 111. 

 1865. Eupachycr. tuberculatus Meek & Worthen. (Erisocr. tuherculatus) Proc. 



Acad. Nat. Sci. Phila., p. 150. Geol. Rep. 111., vol. ii. p. 319. Upper Coal 



measures. Illinois and Iowa. 

 *1867. Eupachycr. verrucosus White. (Hydreionocr. (?)verrucosus). Trans. 



Chic. Acad. Sci., p. 117. Upper Coal measures. Western Iowa. 



20. ERISOCRINUS Meek & Worthen. 



18G4. A Crinoid near Encrinus moniliformis. Marcon. Bull. Geol. Soc, 



France. 

 1865, March. Erisocrinus M. & W. Am. Journ. Sci., 2d ser. vol. xxix. 



p. 174. 

 1865, May. Philocrinus M. & W. Ibid, (not De Koninck, 1863). 

 1865, August. Erisocrinus M. & W. Proc. Acad. Nat. Sci. Phila., p. 149. 



A. Typical form. 



Comparing the Crinoidal fauna of our Western States and 

 territories, as we find it toward the close of the Carboniferous, 

 with that of the same geological age in Central Russia, it is sur- 

 prising to find the same generic forms surviving in both countries. 



