4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



Genotype. — Agelacrimis (Hemicystites) sfellatiis Hall, 1866. Or- 

 dovician (Maysville) of Ohio. Hemicystites carneusis Foerste, 1914, 

 belongs to this genus. 



CARNEYELLA Foerste, 19 16 



Theca typically elevated, sacklike, attached by narrow basal part 

 but also may occur as a thin circular expansion. Ambulacra curved, 

 four (1-4) to left and one (5) to the right, with two rows of covering 

 plates elevated and alternating with each other along the middle line. 

 Oral area composed of three plates, one large and two small. Anal 

 area of many small plates radially arranged. Surface of plates orna- 

 mented with minute pits and nodes. 



Genotype. — Agelacrimis (Lcpidodiscus) pileus Hall, 1866. Ordo- 

 vician (Maysville) of Ohio. Carney ella vetusta Foerste, 1914, is 

 related to C. cincinnaticnsis, n. sp., next described. Carneyclla valcou- 

 rensis Clark, 1920, is doubtfully referred here. 



CARNEYELLA CINCINNATIENSIS, n. sp. 



Plate I, fig. 10 



Agelacrimis (Lepidodisciis) cinciniiaiiensis Hall (not Roemer), Descr. new 

 species fossils Cincinnati, Ohio, p. 214, pi. 2, fig. 7, 1871 (advance sheets, 

 p. 6, 1866) ; 24th Rep. New York State Cab. Nat. Hist., p. 214, pi. 6, fig. 7, 

 1872. 



This well-marked species, erroneously referred to Agelacrimis (now 

 Isorophus) cincinnatiensis Roemer, is readily distinguished from that 

 form by its thin, depressed, almost flat theca attached by its entire 

 aboral portion. P\irthermore, the ambulacral plates are less elevated, 

 all the plates are rather papillose, and there are only three oral plates. 



Occurrence. — Maysville division (Corryville beds) of the Ordo- 

 vician, Warren County, Ohio. 



Holotype.—V.S.'KM. no. 40743. 



ISOROPHUS Foerste, 19 16 



Theca depressed, circular, attached by the entire under surface. 

 Ambulacra composed of two rows of plates with an intercalated series 

 often present, more or less curved, four (1-4) to the left and the 

 right posterior (5) to the right. Oral area occupied by numerous 

 small plates. Margin composed of numerous rows of small plates 

 slightly increasing in size inward. Interambulacral plates polygonal, 

 becoming slightly imbricated. Anal area a circle of triangular plates 

 regularly arranged. 



