NO, 6 NEW AMERICAN EDRIOASTEROIDEA BASSLER 7 



pileiis (Hall), the genotype, forms hemispherical sacks about 15 mm 

 wide and 5 mm high, attached by a broad base, in which the surface 

 ornamentation other than the minute punctations is wanting save 

 on the marginal plates. Carneyella (Lebctodiscus) platys (Raymond), 

 1915 (pl- 7' %• 15) » from the Trenton of Canada, and C. raymondi 

 Clark, 1919, from the Trenton of New York, are referred to the 

 genus with doubt. 



CARNEYELLA (AGELACRINUS) VETUSTA (Foerste), 1914 

 Plate 2, fig. 14 



This species is refigured to show that the papillose surface orna- 

 ment of the plates is a part of the theca and not an incrusting hydroid 

 like Dcrmatostroma, as once believed. Such surface ornamentation, 

 although very well developed here, occurs in various degrees in all 

 species of the genus and, indeed, forms one of the generic characters. 

 The very short, much curved ambulacra and the broad band of highly 

 nodose marginal plates in connection with the depressed disk form 

 of the theca, and the many papillae hiding the outlines of the plates, 

 are the specific characters. 



Occurrence. — Trenton (Cynthiana formation). Clay's Ferry, 14 

 miles southeast of Lexington, Kentucky. 



Holotype.—V.S.NM. no. 87162. 



CARNEYELLA NICKLESI, n. sp. 

 Plate 2, fig. 13 



This well-characterized new species, named in honor of John M. 

 Nickles, bibliographer of American geology, is distinguished at once 

 from all others of the genus by its long, broad, much curved am- 

 bulacra, with about 20 short, wide covering plates in each row, and by 

 the large, slightly imbricating, plainly visible interambulacral plates 

 not obscured by surface ornamentation, which in this case consist of 

 minute papillae arising from the finely punctate surface. 



C. cincinnatiensis Bassler (pi. 2, fig. 15) has a similarly depressed 

 theca and surface ornamentation, but here there are fewer covering 

 plates to a row, the ambulacra curve less strongly, and the whole 

 appearance is less robust. 



Occurrence. — Trenton (Curdsville limestone), near Troy, Wood- 

 ford County, Kentucky. 



Holotype.—U.S.N.M. no. S-3191. 



