34 



Cincinnati Society of Natural History. 



DESCRIPTION OF TWO NEW GENERA AND EIGHT 

 NEW SPECTES OF FOSSTLS FROM THE HUDSON 

 RIVER GROUP, WITH REMARKS UPON OTHERS. 



By S. A. Miller. 



Glyptocrinus miamiensis, n. sp. 



Plate I., fig. 1, side view, natural size. 



This species is established, like many others have been, on a single 

 specimen; but, in this case, we have a remarkably fine head, with arms 

 and pinnules preserved, and 2 4-10ths inches of the column attached. 



Bod} T , proportionally, long and very gentl}- expanding, so that its 

 diameter at the free arms is only about two thirds of its length ; obcon- 

 oidal, with interradial and intersecondary radial spaces depressed, so 

 as to give it subangular outlines corresponding with the radial series. 

 Surface smooth or slightly granular, but devoid of all sculptured, 

 angular and radiated ornamentation. 



Basals. — Basals well developed, forming the lower part of the calyx, 

 with high projecting angles between the under sloping sides of the 

 first primary radials. 



First radials. — First radials large, about as high as wide, hexagonal 

 and having long, under sloping sides resting upon the basals, shorter 

 sides in contact with each other and the interradials, and a truncated 

 upper side. The central part of the surface of the upper half rapidly 

 swells, or is contracted into a round ridge, which, in its extension 

 upward, gives a subpentagonal outline to the body. 



Second radials. — Second radials a little smaller than the first, about 

 as high as wide, and heptagonal, as three interradials abut upon one 

 side of each, and two on the other. The ridge that commences below 

 becomes semi-c\'lindrical in its extension upward across this plate, and 

 gives to this part a decided pentagonal outline. 



Third radials. — Third radials, about the size of the second, nearly 

 as high as wide, and heptagonal, as two interradials abut upon them 

 upon either side. The secondary radials rest upon the upper, slightly 

 sloping sides. The bifurcation of the ascending radial ridge takes 

 place on the upper third of the plate. 



Secondary radials. — In one of the series in our specimen (that 

 upon the right) there is no further division of the radials or arm plates 

 Six or more plates seem to enter into and torm part of the calyx in 



