1881.] NATURAL SCIENCES OP PHILADELPHIA. 3T^ 



1839. Sagenocrinus expansus Phillips. (Aotinocr. expansus) Murchison's Silur. 

 Syst., p. 674, PI. 17. fig. 9 ; Austin, 1843, Sagenoor. expansus Ann. and Mag. 

 Nat. Hist., xi (ser. i), p. 205 ; Morris, 1843, Cat. Brit. Foss. (ed. i), p. 58 ; 

 d'Orbigny, 1850, Glyptocr. expansus, Prodr. de Paleont., i, p. 46; Pictit, 

 1857, Sagenocr. expansus, Traite le Paleont., iv, p. 323; Salter, 1859, 

 Glyptocr. expansus, Silur. Syst. (ed. ii), p. 512, PI. 15, figs. 1, 2; Angelin, 

 1878, Icon. Grin. Suec, p. 8, PI. 15, figs. 6, 8 and (?) PI. 27, figs. 8 a, b and (?) 

 PL 28, fig. 8. Upper Silur. Dudley, England. 

 Si/n. Bhodocr, verus Miller (in part). Nat. Hist, of Crin., p. 106, PI. 1, 

 fig. 1 a. Dudley, Engl. 



c. Rhodocrinites. 

 8. LYRIOCRINUS Hall. 



1852. Hall. Paleont. New York, ii, p. 197. 

 1857. Pictet. Traite de Paleont., iv, p. 329. 



1866. Shumard. Trans. Acad. Sci. St. Louis, ii, p. 379. 



1867. Hall. 20th Rep. N. Y. St. Cab. Nat. Hist., p. 325. 



1879. Hall. 28th Rep. N. Y. St. Cab. Nat. Hist. (ed. ii), p. 139. 



Syn. Marsupiocrinites inofPhiW.), Hall 1843. Geol. 4th Distr. New 



York, p. 114. 

 Syn. Rhodocrmus (not Miller), Hall 1863. Trans. Albany Inst., 



p. 198. 



The genus Lyriocrinus was proposed for a species which had 

 been previously described by Hall under 3Iarsupiocrinites. It 

 was supposed to possess only one ring of plates beneath the 

 radials, but when afterwards five small underbasals were dis- 

 covered, it was referred by Shumard (1866) subgenerically under 

 Bhodocrinus, and this arrangement was adopted by Hall. Lyrio- 

 crinus is at least as distinct from Rhodocrin us as either Glyptocrinus 

 or Glyptaster, which those authors acknowledge as genera without 

 question. 



In 1863 — Trans. Albany Inst., p. 198 — Hall described as 

 Bhodocr . melissa a new species from Waldron, Ind., which we 

 have always suspected to be closely allied to Lyriocrinus, and 

 which, as we have lately ascertained to our satisfaction, belongs to 

 that genus. We are indebted to Wm. F. Gurle}^, Esq., of Danville, 

 111., for the loan of some excellent specimens, which enabled us to 

 examine not only the construction of the arms, but also of the 

 vault which was heretofore imperfectly^ known.^ 



Pictet places this genus under the Carpocrinidae, Zittel under 



' In the second edition of the 28th Rep. New York St. Cab., which came 

 to hand after this was written ; also Hall refers that species but paren- 

 . thetically to Lyriocrinus. 



