LIST OF CRINOIDS OF THE CHICAGO AREA. 

 Order I. LARVIFORMIA. 



Family Pisocrinid^e. 



Pisocrinus benedicti, S. A. M. ; P. gemmiformis, S. A. M. ; P. quinquelobus, 

 Bather. 



Family Stephanocrinid^e. 



Stephanocrinus obconicus, Slocom; 5. osgoodensis, S. A. M. ; S. skiffi, 

 Slocom. 



Family Zophocrinid^e. 



Zophocrinus howardi, S. A. M.; Z. globosus, Slocom; Z. pyriformis, 

 Slocom. 



Family Heterocrinid^e. 



Myelodactylus bridge poriensis, S. A. M. 



Order II. FISTULATA. 



Family Gasterocomid^e. 

 Achradocrinus patulus, Slocom. 



Family Cyathocrinid^e. 



Homocrinus ancilla, Hall;//, cylindricus, Hall. 

 Cyathocrinus turbinatus , Weller; C. vanhorni, S. A. M. 

 Botryocrinus polyxo, Hall. 

 Ampheristocrinus dubius, Weller. 



Family Crotalocrinid^e. 

 Crotalocrinus cora, Hall. 



Order III. CAMERATA. 



Family Platycrinid^e. 



Platycrinus augusta, Slocom; P. dubius, Weller. 

 Marsupiocrinus chicagoensis, Weller. 



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