224 



PALEONTOLOGY OF NEW YORK. 



RHIPIDOMELLA, (Ehlert. 1890. 

 XI. Group of Orthis Michelini, Leveille. 



* 0. circulus, Hall Clinton. 



* 0. uberis, Billings Anticosti. 



* 0. hybrida, Sowerev Niagara. 



* 0. assimilis. Hall.. Lower Helderberg. 



t The speciKc. ii;ui)i> lenlicularis hnving- already been used for a species of Orthis, the name should be 

 changed to Orthin UnUfonirix, ILilL Si-e Repm t of (lie Fourth Geolofjical Dititi-ict of New Yoi'k, paye 175. 



