GENUS CRINOCYSTITES. 319 



arm-bearing plates. The position of the apertur. s has not been deter- 

 mined. 



The specimen described has a length of one incli nnd a diameter of five- 

 eighths of an inch. 



Formation and locality. Tn the Racine limestone ( Niagara group) at 

 llacinc, Wisconsin. 



Among the collections from which the preceding species have been 

 described, there arc some other obscure or imperfect fragments which 

 apparently belong to cystidean forms, but they arc not in a condition to be 

 designated. x 



These localities in Wisconsin have proved more prolific in species of 

 this family of fossils than any others known to me, and some of the forms 

 arc more remarkable than any heretofore described from rocks of this age. 

 [n nearly every locality where those cystideans occur, the Caryocrhius 

 ornatus has been found. The specimens, however, are for the most part 

 small or of medium size, and usually more elongated than the same species 

 in the Niagara group of New-York or in Tennessee. 



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