American Journnl of Gonchology, 1866. 



Plate 12. 



LiNGUAii Dentition. 



Fig. 1. Gyrotoma ovoidea^ Shutll. Fig. 3. Pachyrhilus Iwvissima, Sowb. 

 " 2. To spivosa. Lea. " 4. " Schiedeanvs, Phil. 



