78 The Ohio Journal of Science [Vol. XXI, No. 2, 



PLATE IV. 



Fig. 1. Holocystites alternatus Hall. 



Specimen numbered 839 in the Milwaukee public museum, of Milwaukee, 

 Wisconsin. From the Racine limestone at Racine, Wisconsin. 



Figs. 2, 3, 4. Holocystites alternatus Hall. 



Three specimens from the Cedarville dolomite at Cedarville, Ohio. 



Fig. 5. Holocystites alternatus Hall. 



From the Moodie quarry, in the southeastern part of Wilmington, Ohio; in 

 the Cedarville dolomite. In the Welch collection. 



Fig. 6. Holocystites alternatus Hall. 



Type, numbered 2020, in the American Museum of Natural History in New 

 York City. From the Racine dolomite at Racine, Wisconsin. Figure copied from 

 20th Rep. New York State Cab. Nat. Hist., 1868, PI. 12a, Fig. 6. 



