PATAGONIAN EXPEDITIONS: ZOOLOGY. 



Figs. I,' 



EXPLANATION OF PLATE XLI.B. 



lb. PoTAMOLiTHUs PHiLippiANUs Pils. Front and back vicws of the 



Fig. 2. 

 Fig- 3- 



Fig. 4. 



Fig- 5- 

 Figs. 6, 



Figs. 8, 



Fig. 9. 



Fig. 10. 



1 .1 type 



" " " Young topotype 



PoTAMOLiTHUS BUSCHii Dkr. Front view of specimen from Fray 

 Bentos ........... 



POTAMOLITHUS REBEIRENSIS (?)....... 



POTAMOLITHUS LAPIDUM ELATIOR Pils. FaCC of type . 

 7, "ja. POTAMOUTHUS REBEIRENSIS " " of tWO COtypes 



8^;. POTAMOLITHUS CHLORis " Profile and face of the type. 



POTAMOLITHUS INTRACALLOSUS " " " " " " 



POTAMOLITHUS PARANENSis " Young topotype and the 



type .... 



601 

 601 



581 



585 

 588 



584 

 579 

 584 



589 



(vol hi) 



