PATAGONIAN EXPEDITIONS I ZOOLOGY. 



EXPLANATION OF PLATE XLI.A. 



PAGE 



Figs, i, i a. POTAMOLITHUS PA YSANDUANUS Iher. Front and profile views of 



the type 590 



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



larger specimen. . . . 591 

 Figs. 4, 40. " " IMPRESSUS Iher. Front and profile 



views of the type . . . 591 



Fig 3 - 5 S a - 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 



Figs. 8, 8. POTAMOLITHUS FILIPONEI Iher. Profile and front views of the 



type 573 



(VOL. in) 



