The rays may divide five times, but rarely more than thrice; and their Bundesrat
are equal in value or nearly so. The basal joints of the lower pinnules are usually
rather broad and flattened laterally, with sharp dorsal edges.
Remarks.—The genus Pentacrinus is generally, and with good reason, attributed to
Miller. But a few authors have associated with it the name of von Schlotheim,.’ It is
true that this able paleontologist used Pentacrinites as a generic name a year before the
publication of Miller’s classical monograph ; but he made no attempt to define it as Miller
did, nor did he give diagnoses of any of the species which he referred to the genus.. In


1 Tn several fossil species, however, the cirrus-facets take up the whole height of the nodal joints.
2 Die Petrefactenkunde, Gotha, 1820, p. 327.
(ZOOL, CHALL, EXP,—PART Xxxu.—1884.) i 35


274 THE VOYAGE OF H.M.S. CHALLENGER.
