Amer. Jour. Sci., Vol. IV, 1897. 



Plate XL 



4. 



2. 



FiQ. 1. — Ostrea hatcheri n. sp. One-third natural size. 



Fig. 2. — Ostrea philippii n. sp. One-half natural size. 



Fig. 3. — Ostrea bourgeoisi Rem. One-half natural size (copy). 



Fig. 4. — Ostrea patagonica d'Orb. One-third natural size (copy). 



