PATAGONIAN EXPEDITIONS: ZOOLOGY. 



EXPLANATION OF PLATE XXXIX. 



PAGE 



Figs, i, ia, ib. POTAMOLITHUS HIDALGOI Pils. Three views of type . . 597 

 Figs. 2, 20. POTAMOLITHUS IHERINGI Pils. Two views of type . . 600 

 Figs. 3, 30. POTAMOLITHUS JACUHYENSIS Pils. Two views of type . . 583 

 Fig. 4. POTAMOLITHUS LAPIDUM (d* Orb.). Neanic stage. Uruguay R. 587 

 Figs. 5, 5. " " " Adult " 587 

 Figs. 6, 6a. POTAMOLITHUS SIMPLEX Pils. Two views of type . . . 578 

 Figs. 7, 70. POTAMOLITHUS LAPIDUM SUPERSULCATUS Pils. Front and pro- 

 file views 588 



(VOL. HI) 



