222 
PALAEONTOLOGY OF NEW YORK. 
DINORTHIS 
(nom. propos). 
III. Group of Orthis pectinella, Emmons. 
* 0. pectinella, 
Emmons. 
Trenton. 
0. pectinella, 
var. semiovalis, 
Hall. 
Trenton. 
* 0. Sweeneyi, 
N. H. Winchell. 
Trenton. 
PL^ESIOMYS 
(nom. propos). 
IV. Group of Orthis subquadrata, Hall. 
0. Iphigenia, 
Billings . 
Trenton. 
* 0. porcata, 
McCoy. 
Trenton and Hudson River. 
0. retrorsa, 
Salter. 
Trenton and Hudson River. 
* 0. subquadrata, 
Hall. 
Trenton and Hudson River. 
* 0. deflecta, 
Conrad . 
Trenton. 
* 0. recta, 
Conrad . 
Trenton. 
* 0. loricula, 
sp. nov. 
Trenton. 
HEBERTELLA 
(nom. propos). 
Y. Group of Orthis sinuata, Hall. 
0. Battis, Billings . Quebec. 
0. imperator, Billings . Chazy. 
* 0. bellarugosa, Conrad .. Trenton. 
* 0. borealis, Billings . Trenton. 
0. Lonensis, Walcott . Trenton. 
* 0. insculpta, Hall . Hudson River. 
* 0. occidentalis, Hall . Hudson River. 
* 0. sinuata, Hall . Hudson River. 
0. Scovillii, Miller . Hudson River. 
* 0. Maria, Billings . Anticosti. 
* 0. Daytonensis, Foerste . Clinton. 
0. fausta, Foerste . Clinton. 
