NO. 6 NEW AMERICAN EDRIOASTEROIDEA BASSLER 9 



CARNEYELLA (AGELACRINUS) FABERI (Miller), 1894 



Dr. Foerste has refigured the type of this species, stating that it 

 is too poorly preserved to merit description but that the occurrence 

 of numerous tubercles on the plates suggests relationship to Car- 

 neyella. It is, therefore, probable that the species can be held as 

 valid when similarly ornamented and more complete specimens from 

 this horizon are found. 



Occurrence. — Richmond (Whitewater formation), lietween Osgood 

 and Versailles, Indiana. 



STREPTASTER Hall, 1872 



This genus is well characterized by the sinistral curvature of all 

 its rays and by the small polygonal interambulacral plates forming 

 a mosaic. The number of ambulacra, although normally five, varies. 

 S. (Agelacrinus) septembrachiata (Miller and Dyer) more often 

 has five rays instead of seven as in the type. Specimens of 6". r ever sat a 

 Foerste, more complete than the original, which has one ray reversed, 

 will probably show it to be better placed in Carneyella. 



LEBETODISCUS Bather, 1908 



As shown by the genotype, L. (Agelacrinites) dicksoni (Billings), 

 1857 (pi. I, fig. 11), all five ambulacra are directed toward the left, 

 resembling Streptaster in this respect, but the latter has strongly 

 curving arms closely arranged and lacks the large mosaic interambu- 

 lacral plates. 



LEBETODISCUS LORIFORMIS Raymond, 1915 

 Plate 3, fig. 10 



A view of the type specimen of this species is here introduced to 

 show the relationship of the genus to Carneyella, differing in that all 

 of the ambulacra curve strongly to the left and that large mosaic 

 interambulacral plates separate the rays. 



Occurrence. — Middle Trenton (Cystid beds), Ottawa, Ontario. 



Plastotype.—U.S.^.M. no. S-3882. Original in Victoria Memorial 

 Museum, Ottawa. 



FOERSTEDISCUS Bassler, 1935 



Three well marked species, the genotype F. grandis Bassler, 1935, 

 from the Trenton of Kentucky, and the two herein described, agree 

 exactly in the dextral curvature of all the arms and the mosaic 



