and Species of Crinoidea. 1 99 



petalous. The rays are remarkably small in proportion to the 

 size of the animal. 



Miller has fallen into such important errors respecting this 

 Crinite, that it is difficult to believe the fossil he describes to 

 be identical with this which we are now describing ; but ha- 

 ving access to the specimens he founded the species on, and 

 comparing them with others, we cannot doubt their identity. 



Miller placed it with his genus Cyathocrinites as C. rugosus. 

 The plates he erroneously described as scapulars with a single 

 excavation for the articulation of the arm-joints have no ex- 

 cavation whatever, for there is a regular series of wedge-shaped 

 plates resting on them, and from which the rays, amounting 

 to nearly one hundred, proceed. 



Family Platycrinid^e, 

 containing the genera Platycrinites, Cyathocrinites, and Caryo- 

 crinites. 



Genus Platycrinites, Miller. 

 Genus erroneously described by its founder as having a 

 divided pelvis. On referring to Miller's own specimens it is 

 evident the fossils we are about to describe belong to the ge- 

 nus Platycrinites, w T hich has in reality an undivided dorso- 

 central plate, though Miller thought otherwise. This can be 

 demonstrated by numerous well-preserved specimens, both in 

 our own cabinet and in other collections also. 



P. mucronatus, Austin, sp. 

 Definition given in the first portion of our Monograph now 

 in course of publication. 



P. antheliontes, Austin, sp. 

 Described in our Monograph now in the press. 



P. spinosus, Austin, sp. 

 Defined in Monograph. 



P. trigintidactylus, Austin, sp. 

 Def. — Perisomic plates agree with the generic character, but 

 are somewhat broader than in the typical species laevis. Main 

 rays and subdivisions thirty, closely tentaculated to their ends. 

 Proboscis or oral tube long, central, and plated to its apex with 

 rather small, smooth, hexagonal plates. Column circular at 

 its attachment to the body, but gradually becoming elliptical 

 as it recedes from it. 



Family Actinocrinid^e, Austin, 

 contains the following genera : Actinocrinites, Rhodocrinites, 

 Melocrinites, and Tetracrinites. 



