Tne Ohio Journal of Science 



Vol. XXI DECEMBER, 1920 No. 2 



RACINE AND CEDARVILLE CYSTIDS AND BLASTOIDS 

 WITH NOTES ON OTHER ECHINODERMS. 



Aug. F. Foerste, Dayton. Ohio. 



No adequate study of the cystids of the Cedarville dolomite 

 of Ohio ever has been undertaken. In Volume III of the Report 

 of the Geological Survey of Ohio, published in 1876, Caryocrin- 

 ites ornatiis, Gomphocystites glans, Hallicystis imago, and Holo- 

 cystites abnormis are listed from Bierley's quarry, along the 

 creek four and a half miles east of Greenville, in Darke County, 

 Ohio. On page 417 of the same volume Holocystites cylindricus 

 is included in the list of fossils from the Niagara group, but no 

 locality is mentioned. However, of the species cited, Caryo- 

 ' crinites ornatiis is restricted to the Rochester shale of New York 

 and the adjacent parts of Canada, and, although several 

 species of Caryocrinites occur in the Cedarville dolomite of 

 Ohio, none of these belong to the Rochester form, all being 

 undescribed so far. Gomphocystites glans, moreover, is a Racine 

 species with an elongated stipe, whereas all of the specimens 

 of Gomphocystites found so far in the Cedarville dolomite of Ohio 

 have short stipes. Hallicystites imago is represented by typical 

 specimens from Springfield, Ohio. Forms resembling Holo- 

 cystites abnormis and H. cylindricus also are present in the 

 Cedarville dolomite of Ohio, but have not yet been studied with 

 sufficient care to insure their identity. On the other hand, 

 Holocystites alternatus is represented by characteristic specimens 

 from several localities in Ohio, and a primitive species of 

 Holocystites was described recently (Ohio Jour. Science, 17, 

 p. 203, pi. 9, figs. 3 A, B, C; pi. 10, fig. 8) under the name 

 Holocystites greenviUensis Foerste. In the same paper two 

 cystids were described under the terms Callocystites jewetti 

 elongata Foerste and Callocystites sphceroidalis Foerste. Recent 

 investigations have shown, however, that the latter species is 

 founded on the exterior of Ccelocystis subglobosus, a species 

 already described from the Racine dolomite, the latter being 

 founded on casts of the interior of the theca. 



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