PATAGONIAN EXPEDITIONS : ZOOLOGY. 



EXPLANATION OF PLATE XLI. 



PAGE 



Figs. I, la, id. PoTAMOLiTHUS SYKESi Pils. Three views of type. . . 574 



Fjo-s 2 2a. " " " Gerontic individual . . . 574 



Figs. 3, 4, 5. PoTAMOLiTHUs BisiNUATUS OBSOLETUS Pils. Cotypes . . 577 



Figs. 6, 6a. " " Pils. Two views of type . . 576 

 Fio-s. 7, ya. " " " Two views of a gerontic 



individual. . . . 576 



Figs. 8, Sa. PoTAMOLiTHUS GRACILIS " Two views of the type. . 577 



Figs. 9, 9«. " " viRiDis Pils. Two views of the type. 578 



(vol. Ill) 



