328 PROCEEDINGS OF THE ACADEMY OF [1885. 



1881. A. elegans Wetberby, Journ. Cincin. Soc. Nat. Hist., vol. v, p. 179, PI. 5, 

 fig. 4 a b. — Keokuk gr. Kentucky. 



ALLOPROSALLOCRINUS Lyon and Cass., Rev. ii, p. 113. 



b. Periechocrinites. 



PERIECHOCRINUS Austin, Rev. ii. p. 127. 



S. A. Miller's late additions to this genus were made from 

 natural casts, and there is the usual uncertainty as to their iden- 

 tification. We must consider them as doubtful species, until the 

 external surface is known from casts or otherwise. Miller con- 

 siders Megistocrinus infelix Winch, and Marcy, Saccocrinus 

 infelix Miller, specifically distinct from Saccocrinus Ghristyi 

 Hall, which Hall had doubted. He gives two more figures of the 

 species, Journ. Cincin. Soc. Nat. Hist., vol. iv, PI. 6, figs. 2 a b. 



Additional species : — 



*1881. Periechocr. Egani? (S. A. Miller). Saccocrinus Egani, Journ. Cincin. Soo. 



Nat. Hist., PI. 4, figs. 4, 4 a. — Niagara gr. Chicago, III. 

 *1865. Periechocr. necis? (Winchel and Marcy). Megistocrinus necis, Memoirs 



Bost. Soc. Nat. Hist., i, p. Ill, PI. 2, fig. 15. S. A. Miller, Saccocrinus 



necis, Journ. Cincin. Soc. Nat. Hist., 1881, PI. 4, figs. .'1, Ha. — Niagara gr. 



Chicago, 111. 

 ♦1882. Periechocr. pyriformis ? (S. A. Miller). Saccocrinus pyriformis, Journ. 



Cincin. Soc. Nat. Hist. (July), PI. 3, figs. 3, .'! a.— Niagara gr. Chicago, 111. 

 *1882. Periechocr. urniformis? (S. A. Miller). Saccocrinus urniformis, Journ. 



Cincin. Soc. Xat. Hist. (July!. PI. 4, figs. 2, 2a.— Niagara gr. Chicago, 111. 



ABACOCRINUS Angelin, Rev. ii, p. 133. 



CORYMBOCRINUS Angelin. 



1878. Angelin, Iconogr. Crin. Suec, p. 18. 



1879. Zittel, Handb. d . Palseontologie i, p. 373. 



Syn. Eucalyptocrinus McCoy, 1855 (not Goldfuss). 

 Syn. Clonocrinus Quenstedt, 1876 (not Oehlert, 1879). 



The genus Corymbocrinus was in Pt. ii erroneously referred 

 by us to the Calyptocrinidse. It resembles Eucalyptocrinus so 

 remarkably in the construction of the calyx plates, its deep basal 

 concavity, and the perfect symmetry that prevails throughout 

 the interradii, that we took it to be a connecting link between 

 Actionocrinidae and Calvptocrinidte, but neai'er the latter through 

 Gallicrinus, which we thought to be intermediate between Corym- 

 bocrinus and E ucalyptocrinus. To this view even the branching 

 arms formed no serious objection, as Angelin has figured in the 



