136 



Cincinnati Society of Natural History. 



from 185 1 and Billing's from 1858. But McCoy did not describe his 

 genus, simply referring two species to it. Hall considers that Uras- 

 terella and Palasterina stand on the same footing as they were proposed 

 at the same time and in the same place. But Palasteri?ia was regu- 

 larly described by Salter in 1857. Urasterella has never, so far as 

 known, been described at all. We have, therefore, retained the name 

 given by Billings. 



1. — S. grandis Meek, 1872. 



Attaining a very large size with the body or disc comparatively 

 small or only the breadth of the united inner ends of the five rays; 

 rays long, slender, gradually tapering and very flexible, widest at their 

 immediate connection with the body where they seem to be more or 

 less depressed, but becoming more nearly terete further out ; dorsal 

 surface of disc and arms composed of numerous subtrigonal pieces 

 that rise into pointed tubercles or sometimes assume almost the char- 

 acter of short spinules, and arranged in quincunx order, so as to form 

 about eight rows near the middle of the rays; those of the two outer 

 rows slightly larger than the others ; dorsal pores apparently rather 

 large, and passing through between the concave sides of contiguous 

 pieces; ventral surface of disc unknown; ventral surface of rays with 

 a single row of transverse, adambulacral pieces on each side of a well 

 defined, rather deep and moderately wide ambulacral groove 5 adam- 

 bulacral plates rather more than twice as long as wide, with their 

 longer diameters at right angles to the ambulacral groove, and round- 

 ing over from end to end so as to be more prominent in the middle, 

 connecting with each other by small projecting processes and corres- 

 ponding sinuses on the opposite side; breadth of disc 0.63 inch; 

 length of rays 2.40 inches ; breadth at junction w T ith body 0.36 inch ; 

 diameter from tip to tip of rays 5.50 inches. (Am. Jour. Science, 

 ser. 3, vol. 3, p. 258; Pal. of Ohio. vol. 1, p. 66.) 



Locality. — Richmond, Ind. 



Remarks. — Prof. Meek in his remarks in Palentology of Ohio 

 quotes with approval Hall's suggestion as to the use of Urasterella for 

 Stenaster, but as already noted we have preferred to retain the latter 

 name. 



2. — S. harrisi (S. A. Miller) sp. 1879. 



Body pentagonal ; rays twice as long as diameter of central part 

 of body, flexuous, uniformly tapering to an acute point ; marginal 



