1886.] NATURAL SCIENCES OP PHILADELPHIA. 173 



*186l. C. sangamonensis (M. and W.), Cyathocrinus (?) sangamonensis). Referred 

 by us, Rev., i, p. 1^8, to Eupachycrinus. 

 1867. 0. simplex Trautschold (Type of the genus). Formerly referred by us to 

 Eupachycrinus. 



EUPACHYCRINUS M. and W., Rev., i, p. 1.33. 

 (Restricted, W. and Sp.). 



Accepting- the genus Gromyocrinus, we have to consider only 

 those species in which the cup is depressed or saucer-shaped, with 

 small underbasals hidden from view and placed at the end of the 

 basal concavity. These species, however, are divisible again into 

 two groups : a, species with three azygous plates within the dorsal 

 cup, i. e., the typical form of Eupachycrinus^ and : b, species with 

 a small anal plate, partly extending into the equatorial regions, 

 for which White proposed the genus Geriocrinus. Accepting 

 also this division (see Geriocrinus), a.nd admitting into Eupachy- 

 crinus such species as " Gromyocrinus " gracilis Wetherby, which 

 has but five arms, and Eupachycrinus spartarius, Miller, with 

 fourteen arms, we must modify our former generic formula so as 

 to admit species with five to fifteen arms in place of ten, as we 

 had previously given it. Thus restricted, Eupachycrinus is a 

 strictly American genus, embracing only the following species : 



Eupachycrinus Bassetti Worthen, E. Boydii, E. crassus, Meek 

 and Worthen, E. formosus Worthen, E. orbicularis (Hall), E. 

 quatuor-decim-hrachiatus (Lyon), E. subtumidus Worthen, E. 

 tuberculatus M. and W., and E. verrucosus White, all previously 

 reported, and perhaps also E. plafybasilis White, which is very 

 imperfectly known, and may be a Zeacrinus. 



We also place here : 



1882. Eupachycrinus asperatus Worthen, Bull, i. 111. St. Mus. Nat. Hist., p. 34; 

 also (reol. Rep. Illinois, vii, p. 311, PI. 29, fig. 4. Kaskaskia gr. Monroe 

 Co., Illinois. 

 *1880. E. gracilis (Wetherby), Gromyocrinus gracilis, .Journ. Cincin. Soc. Nat. 



Hist., p. 4, PI. 16, figs. 2 a, b, c. Kaskaskia gr. Pulaski Co., Ky. 

 1847. E. maniformis (Shum.), Zeacrinus maniformis. This species was referred 



by us Rev. i, p. 117, to Scytalocrinus. 

 * E. Moorei (Whitfield), Zeacrinus Moorei, Palcont. Ohio, vol. iii, PI. 11, 



figs. 6, 10. Coal measures. Hocking Co., 0. (not published). 

 1882. E. monroensis (Worthen), Bull, i, 111. St. Mus. Nat. Hist., p. 34; also Geol, 

 Rop. 111., vii, p. 312, PI. 19, fig. 16. Kaskaskia gr. Monroe Co., Illinois. 

 1879. E. spartarius S. A. Miller, Journ. Cincin. Soe. Nat. Hist. (April), PI. 8, fig. 

 2. Kaskaskia limest. Pulaski Co., Ky. 

 Syn. E. germanus S. A. Miller, ibid., PI. 8, fig. 3. 



