16 CATALOGUE OF THE 



*Lingulella cincinnatiensis, Hall & Whitfield. 

 tOrthis aequivalvis, Hall. 

 *Orthis bellula, James. 

 ^ *Orthis biforata, Schlothelm. 

 *<* Orthis biforata, var. acuminata, James. 

 A^*Orthis biforata, var. acutilirata, James. 

 Orthis biforata, var. anniana, James. 

 Orthis biforata, var. cypha, James. 

 »^ Orthis biforata, var. clentata, Pander. 

 Orthis biforata, var inflata, James. 

 *Orthis biforata, var. laticostata, James. 

 ^ *Orthis biforata, var. lynx, Von Buch. 

 •^ Orthis biforata, var. profundo-sulcata, Owen, 

 *Orthis borealis, Billings. 

 Orthis clytie, Hall. 

 Orthis centrilineata. Hall. 

 Orthis cincinnatiensis, Ulrich. 

 Orthis crassa, James. 

 *Orthis cyclus, James. 

 Orthis dichotoma. Hall. 

 Orthis disparilis, Conrad. 

 ^ *Orthis ella. Hall. 

 »^ *Orthis emacerata, Hall. 



Orthis emacerata, var. meeki, S. A. Miller. 

 Orthis erratica, Hall. 

 '^ *Orthis fissicosta, Hall. 

 *Orthis insculpta. Hall. 



Orthis jamesi. Hall. 



*Orthis linneyi, James. 

 Orthis merope, Billings. 

 K' Orthis morrovvensis, James, 

 w^ *Orthis multisecta, James. 



■■Orthis neglecta, James. 

 K ^Orthis occidentalis. Hall. 



Orthis orthambonites. Pander. 



Orthis j)ectinella, Conrad. 



Orthis pectinella, var. semiovalis, Hall. 



