21 
Explanation of Plate II. 
Fig 1. Tooth of Helodm aubtvberatus, viewed from above. Type, Cat. No. 7764. 
“ 2. The same; side view. 
“ 3. The same; side view. 
“ 4. Portion of tooth provisionally assigned to //. subtuberalus; viewed from 
above. Cat, No. 7765. 
All the figures in this plate are en'.arged two diameters. 
