6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 95 



Occurrence. — Trenton {Strophomena vicina zone), Carntown, 

 Kentucky. 



Cotype.—U.S.'NM. no. 87163. 



CINCINNATIDISCUS TURGIDUS, n. sp. 

 Plate 5, fig. 12 



Based upon a single specimen, 8 mm in diameter, associated with 

 Isorophus austini (Foerste) encrusting a Rafinesquina shell. Except 

 that the fifth ray has been destroyed, the theca is well preserved and 

 shows the usual generic characters. The ambulacral covering plates, 

 10 to 12 to each row, are about as broad as in C. stellatus (Hall), 

 but are much longer in the middle part of the ray, becoming con- 

 siderably narrowed at the extremity, thus giving the ambulacra a 

 swollen aspect. Although this is emphasized in the type specimen 

 by the fact that the plates of several rays have been pulled apart 

 slightly, nevertheless they are clearly wider in the midlength of a 

 normal ray. 



Occurretice. — Richmond (Whitewater formation), Oxford, Ohio. 



Holotype.—U.S.'NM. no. 87628. 



CINCINNATIDISCUS EDENENSIS, n. sp. 

 Plate 2, fig. 10; plate 3, fig. 11 



Similar to C. stellatus (Hall) in general features, but differing in 

 that the rays are broader and the ambulacral covering plates are much 

 longer and so narrow, erect, and imbricating that they appear as 

 sharp edges. 



Occurrence. — Cincinnatian (Eden-McMicken beds), Cincinnati, 

 Ohio. 



Holotype. — U.S.N.M. no. 34413. 



CARNEYELLA Foerste, 1916 



Theca typically elevated, sacklike, attached by a broad basal part, but 

 also of depressed parasitic disks ; ambulacra curved, four to the left 

 and the right posterior to the right. Oral area of three plates, one 

 large, next to the anal region, and opposite these two small. Surface 

 of plates minutely pitted but often ornamented with conspicuous nodes 

 and ridges. 



Three well-marked new forms here noted with four previously 

 known, ranging from the base of the Trenton through the Richmond, 

 give this genus a good representation and range. C. (Agelacrinus) 



J 



