EXPLANATION OF PLATE XLI.B. 



(VOL. in) 



PAGE 



Figs, i, i a, \b. POTAMOLITHUS PHILIPPIANUS Pils. Front and back views of 



the type . . . 60 1 



Fig. 2. POTAMOLITHUS BUSCHII (Ffld.) 580 



Fig. 3. POTAMOLITHUS RIBEIRENSIS (?) 584 



Fig. 4. POTAMOLITHUS LAPIDUM ELATIOR . . . . . . 588 



Figs. 5, 6. POTAMOLITHUS RIBEIRENSIS Pils 584 



Figs. 7, 70. POTAMOLITHUS CHLORIS . . . . . . . 579 



Figs. 8, Sa. POTAMOLITHUS INTRACALLOSUS. . . . . . . 584 



Figs. 9, 10. POTAMOLITHUS PARANENSIS 589 



