PLATE 2 



12 



7. Oxyhemoglobin of (lie Sturgeon (Ari/n 'list ; sturici), showing general view of smaller crystals. 



8. Same, showing brachypinacoid aspect in large crystals. 



9. Oxyhemoglobin of the Sluul (Almm sopidisstmo), showing aggregates producetl by twinning, horse-type. 



10. Same, showing large twin aggregate, horse-type. 



11. Oxyhemoglobin and Methemoglobin of the Shad, showing twins of Oxyhemoglobin. 



12. Same, showing star-shaped twins of horse-type. 



