Oct., 1907. New Crinoids — Slocom. 303 



Previous to the present publication there have been described 

 from the Chicago Area a total of 62 species of crinoids divided among 

 26 genera. A complete list of these was given by Weller in 1900.* 

 Two years later Weller obtained a specimen which showed that 

 Cyathocrinus cora Hall and Crotalocrinus americanus Weller were one 

 and should be known as Crotalocrinus cora Hall, f thus making the 

 number of species 61. The species obtained by the present writer 

 increase the total number of species of crinoids known from the Chicago 

 Area to 75 and that of the genera to 30. A full list of these follows. 

 In addition it may be noted that several specimens which were 

 associated with those here described and which are evidently new 

 species proved too fragmentary for description. Should better speci- 

 mens of these be obtained, three or more new species and at least one 

 new genus may be added to the list. 



* Bull. 4, Nat. Hist. Surv., Chicago Acad. Sci., Pt. I. 

 t Jour. Geol., Vol. X, pp. 532-4. 



