376 TRANS. OP THE ACAD. OF SCIENCE. 



GRANATOCRINUS (continued), 



Roemeri — Pentremites Roemeri, Sbumard, 1855. 2d Geol. Rep. 



Missouri, pt. 2, p. 186, pi. B., fig. 2 a. (Exclude fig. 2 b. c 



d.) — Chem. — Providence, Boone Co., Missouri. 

 Sayi, Sbumard, 1855. 2d Rep. Geol. Surv. Missouri, pt. 2, p. 185, 



pi. B., fig. 1. — Enc. — Boone, Marion, St. Louis and Ste. 



Genevieve Counties., Missouri. 



GRAPHIOCRINUS,t De Koninck and Le Hon, 1854. Rech. Crin. 



Garb, de la Belgique, p. 115. 

 dactylus, Hall, 1860. Geol. Iowa, Sup. to vol. i., p. 81.— St, L.— 



Near St. Louis, Missouri. 

 quatuor- decem-brachialis, v. Cyathoerinus 14-brachialis. 



HAPLOCRINUS, 



Clio, Hall, 1862. 35th Rep. Reg. State Cab. New York, p. 143.— 



Marc. — Onondaga Co., New York, 

 granulatus,* Troost, 1850. List Crin. Tenn., Proc. Amor. Assoc. 



Camb. Meet., p. 61. — Niag.{'i>) — Decatur Co., Tennessee, 

 hemisphericus,* id. ibid. — Mag.(?} — Decatur Co., Tennessee, 

 maximus,* id. ibid. — Niag.(?) — Decatur Co., Tennessee, 

 ovalis,* id. ibid. — Niag.(?) — Decatur Co., Tennessee. 



HEMICOSMITES, Von Buch, 1840. Monatsber. d. Berlin Akad., 

 p. 129. 



subglobosus, Hall, 1864. New Fossils Niag. Group, p. 12. (Ext. 

 from 18th Rep. Reg. State Cab.) — Niag. — Racine, Wis. 



HEMICYSTITES, v. Agelacrinus. 



HETEROCRINE, Hall, 1847. Pal. N. York, vol. i., p. 278-.— Deca- 

 DACTYLOCRiMTES,t Owen, 1843. Cat. Geol. Spec, of Ohio 

 Valley. 



articulosus, Billings, 1859. Canad. Org. Rem., Dec. i-v., p. 51, 

 pi. 4, fig. 8.— if. R. G.— Ottawa, Canada. 



t I have Ion" heen of opinion that the pieces described by Messrs. De 

 Koninck and Le Hon as the basals in their Genus Graphiocrinus, are in 

 reality the subradials; and that the former, from their minuteness, and 

 perhaps from being concealed by the last joint of the column, have escaped 

 the notice of these distinguished authors. If, upon a more critical exam- 

 ination of type specimens, this surmise shall he found correct, it will be- 

 come necessary to transfer a number of American species, now arranged 

 in Zeacrinus and Scaphiocrinus, into the Genus of De Koninck and Le 

 Hon. The Graphiocrinus encrinoides of these authors so closely resembles 

 in general form, and in the proportion and arrangement of its parts, the 

 American Poteriocrinus (Zeacrinus) maniformis, Yandell and Sbumard, 

 that it is difficult to believe they belong to distinct genera. Indeed, were 

 it not for the greater size of the former, I should be inclined to regard the 

 two forms as specifically identical. 



* It is extremely doubtful whether any of these species belong to Haplo- 

 crinus. I have in my collection two small Crinoids from the glades of De- 

 catur County, Tennessee, which were referred by Dr. Troost to this Genus. 

 One of these has since been described by Rcemer (Sil. Faun. West Tenn.) 

 as Poteriocrinus piriformis, and the other as Synbathocrinus Tennesseensis. 



% This name appears in Owen's Catalogue, but I do not think any de- 

 scription of the Genus was published under this designation. 



