102 Cincinnati Society of JVatural Histonj. 



collected, at various elevations, in the Cincinnati Group. Thei-e is 

 some difference in the appearance of these bases, but all seem to have 

 the radiating striae. The striae, on the neck of this species, evinces, 

 that it was possessed of one of these flattened bases, but we are unable 

 at the present time to determine whether it was one of the coarser or 

 finer lined ones. 



Pal^aster longibrachiatds, n. sp. (Plate 3, fig. 4.) 



[Ety.—io7ififi6r«cAia<iw, having long arms -1 



Pentagonal; rays more than twice as long as the diameter of the 

 body, and tapering to an acute point at the apices; breadth of the body 

 between ra^^s, about six tenths of an inch; length of rays, about one 

 and three tenths inches. 



The marginal plates are small, spheroidal, yery gradually enlarging 

 from the tip of the rays toward the bod}^ and much resembling a 

 string of small beads gradually swelling in size. Thirt^'-two marginal 

 plates are visible, in the specimen illustrated, on one side of a ray, and 

 a perfect specimen would probabl}^ show two or three more. Two 

 marginal plates form the junction of the rays instead of one, as in 

 other species. In this respect, it agrees y^\t\\ Stenuster, but the arms 

 show adambulacral plates, for which reason we regard it as a Paloeas- 

 ter. The adambulacral plates, toward the point of the rays, are of the 

 same form, but a little larger than the marginal plates; near the body, 

 however, the marginal plates are the largest. No adambulacral piece 

 is visible within four plates of the two junctional pieces. The ambu- 

 lacral groove is exceedingly narrow. 



Dorsal suriace and madreporiform tubercle unknown. 



The specimen illustrated was found near Clarksville, in the upper 

 part of the Cincinnati Group, and now belongs to the collection of Mr, 

 J. H. Harris, of Waynesville, Ohio. 



Pal^aster clarkei, n. sp. (Plate III., fig. 5.) 



Pentagonal; rays half the leogth of the diameter of the body, and 

 rapidly tapering to a point. Marginal plates not very distinctly shown 

 in the specimen, but probably do not exceed half a dozen on each side 

 of a ray. Three series of interlocking pieces are shown, upon the dor- 

 sal side of each ray, between the marginal plates. 



Length of a ray, l-loth of an inch; diameter of the bod}^ 2 loths of au 

 inch; and greatest distance from the apex of one ray to that of anoth- 

 er, 4-15ths of an inch. 



The madreporiform tubercle and ventral side unknown. 



This very small Palicaster was found on Vine street Ilill, in Cinciu- 



