224 
PALAEONTOLOGY OF NEW YORK. 
* 0. Macleodi, 
Whitfield. 
* 0. subsequata, 
Conrad'. 
* 0. Minneapolis, 
N. H. Winchell. 
0. gibbosa, 
Billings. 
# 0. perveta, 
Conrad. 
* 0. Stonensis, 
S AFFORD.*. 
* 0. testudinaria, 
Dalman . 
* 0. bellula, 
Meek . 
# 0. crispata, 
Emmons . 
* 0. emacerata, 
Hall . 
* 0. Meeki, 
Miller . 
* 0. multisecta, 
Meek. 
* 0. elegantula, 
Foerste . 
* 0. elegantula, 
Dalman- . 
* 0. arcuaria, 
sp. nov. 
* 0. concinna, 
Hall . 
* 0. perelegans, 
Hall . 
# 0. planoconvexa, 
Hall . 
# 0. quadrans, 
Hall . 
* 0. subcarinata, 
Hall . 
* 0. lenticularis,f 
Vanuxem, non Wahlenberg, 
* 0. lepida, 
Hall . 
* 0. infera, 
Calvin . 
* 0. Leonensis, 
Hall . 
* 0. superstes, 
sp. nov. 
Calciferous. 
Chazy—Trenton. 
Trenton. 
Trenton. 
Trenton. 
Trenton. 
Trenton—Hudson River. 
Hudson River. 
Hudson River. 
Hudson River. 
Hudson River. 
Hudson River. 
Clinton. 
Niagara. 
Niagara. 
Lower Helderberg. 
Lower Helderberg. 
Lower Helderberg. 
Lower Helderberg. 
Lower Helderberg. 
Upper Helderberg. 
Hamilton. 
Chemung. 
Chemung. 
Chemung. 
RHIPIDOMELLA, CEhlert. 1890. 
XI. Group of Orthis Michelini, Leveille. 
* 0. circulus, 
* 0. uberis, 
* 0. hybrida, 
* 0. assimilis, 
Hall . Clinton. 
Billings . . Anticosti. 
Sowerby . Niagara. 
Hall . Lower Helderberg. 
t The specific name lenticularis having already been used for a species of Orthis, the name should be 
changed to Orthis lentifortnis, Hall. See Report of the Fourth Geological District of New York, page 175. 
