244 
By MM. Austin^ P, isacohus. 
JP. rostratus. 
P. plicatus. 
P. radiatus. 
P. quinquangularis (Miller). 
P. latifrons. 
P. dactyloides. 
P. pentagonus. 
P. longidactylus. 
P. ahhreviatus. 
By McCoY^ P. nuciformis. 
P. crassimanus. 
P. gracilis. 
P. ( Cupressocrinus) impressus. 
P. (Cupressocrinus) calyx. 
By De Koninck^ P. McCoyanus. 
P. spissus. 
II. — Diagnosis of the genus as now restricted, ivith a List of 
Species referable thereto. 
PoTERiocRTNUS (Miller), Amend. 
Calyx longer than broad ; contour, truncate obconical. 
Basal plates, five; more or less elongate, springing directly 
from the column, and at no great angle of outward 
divergence. 
Sub-radials, five ; alternating with the basals ; usually 
longer than broad. 
First radials connected laterally, generally wider than long; 
pentagonal, except the two postero-lateral, which are subject 
(3) Austin (T. and T. jun.)— A Monograph on Kecent and FossQ Crinoidea. 
(4) McCoy — Annals and Mag. of Natui-al History. Series 2, vol. iii., p. 244. 
Griffiths — Carb. Limest. Foss. Ireland, p. 178. 
(5) De Koninck and Le Hon— Recherches sur lea Crinoides du Terrain 
Carbonifere de la Belgique. » 
