Plate 18 



From photographs 



Figures 1-4. Sorites marginalis (Lamarck). From Tortugas, Fla. X 20. 



5-7. Amphisorus hemprichii Ehrenberg. X 20. Figs. 5, 6, Tortugas, 

 Fla. Fig. 7, Ely's Harbor, Somerset, Bermuda. 



75 



