PLATE 1 



1. Oxyhemoglobin of the barndoor Skate (Raid Icevis), showing sheaf-shaped crystal aggregates seen 



on edge. 

 2, 3. Same, seen in the flat aspect. 



4. Same, showing twinning. 

 5, 6. Oxyhemoglobin of the Sturgeon (Acipenser sturio), showing brachypinacoid aspect. 



