II. 
THE CLINTON GROUP OF OHIO. PART IF 
BY A. F. FOERSTE. 
CRUSTACEA. 
I. Acidaspis Ortoni, . . . n. sp. 
IL Proetus determinatus, . . . ’ n. sp. 
HI. Proetus , 
IV. Iltenus Daytonensis, . . Hall and Whitfield. 
V. ^Illaenus Madisonianus, . . Whitfield. 
VI. Illaenus ambiguus, . . . Foerste. 
VIE Calymene Vogdesi, . . . n. sp. 
VIII. Ceraurus , . 
IX. Lichas breviceps, . . . Hall. 
X. Phacops pulchellus, . . . n. sp. 
XI. Dalmanites Werthneri, . . Foerste- 
XII. Encrinurus Thresher!, . . n. sp. 
In the first paper of this series two new species of trilobites were 
published and a provisional arrangement of the others was made. 
Since its publication fresh material has been accumulating and a wider 
literature has been examined, so that many things then left undecided 
can now be definitely determined. The following pages may there- 
fore be considered a revision. 
