376 PROCEEDINGS OF THE ACADEMY OF [1896. 



Plate X. 



Figs. 1 and 2. Lepiis arcticus bangsi Rhoads. (Type). Mandible 

 and super anterior view of rostrum. 



Fig. 3. Lejms tsckuktschorum (Nordq.). (No. 1,588, 1. c). Man- 

 dible. 



Fig. 4. Upper incisor typical of tiniidi(s and arcticus types. (From 

 a specimen of Alaskan L. tschuktschorum). 



Fig. 5. Lepus grcenlcmdicus. (No. 3,779, 1. c). Upper incisor. 



Fig. 6. Lepus g7-cenlandicus. (No. 3,779, 1. c). Mandible. 



Fig. 7. Lepus gnenlandicus. (No. 3,779, 1. c). Super anterior view 

 of rostrum. 



Fig. 8. Lepus timidus L. (No. 408, 1. c). IMandible. 



