PATAGONIAN EXPEDITIONS: ZOOLOGY. 



EXPLANATION OF PLATE XLI.A. 



PAGE 



Figs. I, xa. PoTAMOLiTHUs PAYSANDUANUS Iher. Front and profile views of 



the type ..... 590 



Figs. 2, 3. " " siNULABRis Iher. Type and a 



larger specimen. . . . 591 

 Figs. 4, 4«. " " iMPRESSus Iher. Front and profile 



views of the type . . . 591 



Figs. 5, 5a. PoTAMOLiTHUS CARiNiFER Pils. Front and back views of the type. 592 

 Figs. 6, 6a. Potamolithus quadratus " " " profile " " " 592 



Fig. 7. Potamolithus lapidum supersulcatus. Back view " " 588 



Fies. 8, 8a. Potamolithus filiponei Iher. Profile and front views of the 



type 573 



(vol. hi) 



