EEVISIOIST OF PALEOZOIC STELLEEOIDEA. 137 



separated and wedged in between the adjoining four supramarginal 

 ossicles. There appear to be 10 or 11 of these in a column. On each 

 side of the radial columns in the proximal half of each ray are a number 

 of small accessory plates arranged in irregular columns. All of the 

 abactinal plates are more or less convex and bear numerous small 

 pustules clustered around a larger central one, all of which bore small 

 spines. 



Supramarginal plates very conspicuous, subquadr angular in out- 

 line, generally a little wider than long, with numerous small pustules, 

 among which toward each lateral edge is a large one upon which 

 probably articulated prominent spines. There are from 11 to 13 of 

 these plates in each column. In the distal third of a ray both 

 columns approximate and adjoin each other closely. Each supra- 

 marginal plate lies wholly and directly over an inframarginal and the 

 pieces appear as one consolidated plate with the abactinal side convex 

 and the actinal nearly flat. The supramarginals are the widest and 

 extend in part over the adambulacrals. 



Madreporite small, circular in outline, slightly convex and very 

 finely radially striated. It lies directly upon two basal supramar- 

 ginal plates of adjoining rays and directly outside of one of the large 

 interradial plates. 



An ocular plate terminates each ray. 



Inframarginals apparently like the supramarginals excepting 

 distally, where they are nearly twice as long as wide. 



Adambulacral plates smaller than the inframarginals, nine in 

 the space occupied by five of the latter, somewhat wider than long, 

 convex, and covered with numerous small pustules. 



Ambulacral grooves very narrow in the distal region. The ambu- 

 lacral plates appear to be as numerous as the adambulacrals, and are 

 h- -shaped, with the podial openings between the plates in about the 

 mid-width of the column. 



All other actinal characters are unknown, since the two specimens 

 expose the abactinal area, though one has portions of the plates 

 removed, revealing the actinal characters described. 



Formation and locality. The type-specimen is in the Harris 

 collection of the United States National Museum, and another 

 specimen is in the Dyer collection of the Museum of Comparative 

 Zoology (No. 4). Both were found in the crinid beds of the Keokuk 

 group of the Lower Carboniferous at Crawfordsyille, Indiana. 



Remarks. There is no Carboniferous asterid with which Neopalse- 

 aster crawfordsvillensis can be confounded. 



Cat. No. 60607, U.S.N.M. 



