186 PROCEEDINGS OF THE ACADEMY OP [1886. 



by syzygy ; pinnules long, and placed far apart. Column round 



or pentangular, with or without cirrhi. 



1845. Dadocrinus gracilis (L. v. Buuh), v. Meyer, Encrinus gracilis, Bericht d. 

 Ber). Acad., p. 27. Dadocriuus gracilis H. v. Meyer (Type of the genus), 

 1847, Leonh. Bronn's Jahrb., p. 675; also Palaeontogr., i, p. 266, PI. 31, fig. 

 2 and PI. 32, figs. 4, 5, 6 ; PI. 31, figs. 9, 13; PI. 32, fig. 7. Encrinus gra- 

 cilis Beyrich, Ueber die Crin. d. Muschelk., p. 42, PI. 1, fig. 15. Muschel- 

 kalk Trias. Recaoro, Italy. 

 1884. D. Kunischi W. and Sp. Described and figured by Mr. Kuniseh as Encrinus 

 gracilis, Zeitschr. d. Deutsch. geol. Gesellsoh., Jahrg., 1883, p. 195, with 

 plate. Muschelkalk. Upper Silesia. 



Family XXIV. A.STYLOCRINIDJE Roemer. 

 The Asty locrinidae embrace only the genus Agassizocrinus, vfh\ch. 

 Pictet referred to the Comatulidse, Zittel to the Poteriocrinidje. 

 Roemer included in this family Marsupites. We place here pro- 

 visionally the genus Udriocrinus, which, however, in all proba- 

 bility, forms a family by itself, being sessile in early life, and 

 having no underbasals. 



AGASSIZOCRINUS Troost. 

 (PI. 5, fig. 17.) 



1850. Troost, Journ. Am. Ass. Adv. Sci. Camb. Meeting, p. 69. 



1851. Owen and Shum., Journ. Acad. Nat. Sci. Pbila. (n. ser.), vol. ii. 

 1853. Shumard, Marcy's Rep. Red River Exped., of Louisiana, p. 173. 



1852. Owen and Shuin., Geol. Rep. la., Wise, and Minn., p. 597, 

 1858. Hall, Geol. Rep. Iowa, vol. i, Pt. ii, p. 684. 



1873. Worthen, Geol. Rep. Illinois, vol. v, p. 556. 



1874. Meek, Amer. Journ. Sci. (Ser. 3;, vol. vii, No. 41, p. 484. 

 1879. Zittel, Handb. d. PaL-eontologie, i, p. 861. 



Syn. Astylocrinus, 1854, F. Roemer, Letb. Geogn. (Ausg. 8), p. 229; 

 also Dujardinand Hupe, 1862, Hist, natur des Zoopb. Ecbin., p. 159. 



The name Agassizocrinus appears in Troost's List of the Cri- 

 noids of Tennessee, but the genus was not defined until 18.53, 

 when Shumard, in Marcy's Report on the Red River Expedition, 

 published Troost's MS. of Agassizocrinus dactylifor-mis, which he 

 accompanied with a short generic description of his own. Asty- 

 locrinus wa,s proposed by Roemer as late as 1855, when he described 

 under the name Astylocrinus laevis, a nearly perfect specimen from 

 a plaster cast, sent to him by Shumard's brother with Troost's 

 name Agassizocrinus dactyliformis attached. There cannot be 

 the least doubt as to the priority of Agassizocrinus, but it is 

 probable that Roemer's specimen, which was Troost's type, is 

 specifically distinct from the one figured by Shumard under 

 Troost's name, and hence we recognize Roemer's specific name. 



t 



