188G.] NATURAL SCIENCES OF PHILADELPHIA. 83 



added Triacrinus, which Zittel, Angeliii and Miller made the type 

 of a distinct family. We admit there are close affinities between 

 Haplocrinus, Triacrinus and Pisocrinus, but we believe the last 

 .two are closer allied to Symbathocrinus (see our notes on the 

 SymbathocrinidiB). Pictet refers to the Haplocrinidae : Haplo- 

 crinus, Goccocrinus^ Myrtillocrinus^ Ceraviocrinus, Ej)a,ctocrinus 

 and G aster ocoma ; Dujardin and Hupd: Haplocrinus, Gocco- 

 crinus, Myrtillocrinus and Stephanocrinus. D'Orbigny arranged 

 his " Aplocrinidse " between the Pentremitidse and Cupresso- 

 crinidae. 



In Troost's catalogue of 1850 we find the following names: 

 Haplocrinus granulatus^ H. hemisphericus, H. maximus and H. 

 ouaZis, which have not been defined, and are species of Pisocrinus 

 and Triacrinus. Haplocrinus anmilaris and H. monile were 

 defined by Eichwald from pieces of the column. 



HAPLOCRINUS Steininger. 



(PI. 5, figs. 1, 2.) 



1834. Steininger, Bull. Soc. geol. de France (Ser. i), vol. viii, p. 231. 



1844. F. Roemer, Rhein. Uebergangsgebirge, p. 63. 



1849. Steininger, Versteinerungen der Eifel, p. 20. 



1853. Steininger, Geognostische Beschr. d. Eifel, p. 36. 



1852. Quenstedt, Handb. d. Petrefactenkunde, p. 624. 



1855. J. Mtiller, Verb, naturh. Verein, Jahrg. xii, p. 21. 



1855. F. Roemer, Lethaea Geogn. 1855 (Ausg. 3), p. 260. 



1857. Pictet, Traite de Paleont., iv, p. 308. 



1862. Dujardin & Ilupe, Hist, natur. des Zoophytes Ecliin., p. 105. 



1862. Hall, 15th Rep. N. Y. St. Cab. Nat. Hist, p. 143. 



1866. Scbultze, Echin. Eifel Kalk., p. 103. 



1868. De Koninck, Bull. d. I'Acad. Roy. d. Belg. (Ser. 2), Tome iii (Extr. 



p. 63). 

 1879. Zittel, Handb. d. Palseont., i, p. 347. 



1882. Quenstedt, Handb. d. Petrefactenkunde (Ausg. 3), p. 964. 

 1885. P. H. Carpenter, Chall. Rep. Crinoidea, p. 158, etc. 



Syn. Eugeniacrinites Goldfuss (in part), 1826, Petref. Germ, i, 

 p. 213. 



Syn. Aplocrinus d'Orbigny, Prodr. i, p. 102. 



Syn. (?) DimorpJiocrinus d'Orbigny (Zittel). 



The first species of this genus was described by Goldfuss under 

 Eugeniacrinites mespiliformis. Goldfuss did not know the con- 

 struction of the plates, nor did Steininger who described the 

 same species under Haplocrinus spaeroideus. F. Roemer, in 1844, 

 gave a good description of the plates, but his way of interpreting 



