Plate 17 



From photographs 



Figures 1, 2. Archaias compressus (d'Orbigny). Ely's Harbor, Somerset, 

 Bermuda. X 20. 

 3-5. Archaias angulatus (Fichtel and Moll). Figs. 3, 4, San Juan 

 Harbor, Porto Rico. X 20. Fig. 5, Tortugas, Fla. X 15. 

 74 



