52 



PALiEONTOLOGY OF NEW-y^ORK. 



Fig. 6 a. A portion of the frond of this species, natural size. 

 Fig. 5 b. A portion of the poriferous face magnified. 



Fig. 5 c. A portion of the non-poriferous face magnified, showing distinctly the form of the fe- 

 nestrules. 



Position and locality. In the impure calcareous layers associated with the ore bed at Wol- 

 cott furnace, and at Whiting's mill, Wayne county. {State Collection.) 



CRINOIDEA OF THE CLINTON GROUP. 



The Crinoidea peculiar to this group are few and rare ; and though the joints of a single 

 species are very abundant in some localities, the remains of this class of animals do not in 

 general form any distinguishing feature of the strata. 



In the lower part of the group, and particularly in the eastern and central localities, these 

 remains are rarely seen, with the exception of some peculiar rings in the ore beds of Herkimer 

 county. After passing west of the Genesee river, the upper limestone is often composed in great 

 measure of the fragments of crinoidal columns ; and at Lockport, numerous fragments of co- 

 lumns and some of the bodies have been found, but even here they are obscure and unsatisfac- 

 tory. At this locality, however, I have found, in the upper limestone of the group, fragments of 

 Hypanthocrinus and Caryocrinus, which we regard as typical of the Niagara group. In the 

 same limestone. Col. Jewett has found the body of a Caryocrinus, exhibiting a curious 

 anomaly in the development of the plates. 



^*^ The description of the crinoidea of this group will be deferred in this place, and given 

 altogether with those of the Niagara group. 



