On Prophysaon, etc. 311 



Fig. 4. The same. Jaw. 



Fig. 5. Helix hjchnuchus, Miill. Jaw. 



Fig. 6. The same. Genitalia. The accessory gland of 

 the epididymis is not shown in the figure. It was broken off. 



Fig. 7. The same. A group of central and lateral teeth 

 of the lingual membrane. 



Fig. 8. The same. Marginal teeth from the left of the 

 median line of the lingual membrane. 



PriDted at the Salem Pbess, July, 1873. 



