PLATE 3 



18 



13. Metoxyhemoglobin of the Shad (Alosa sapidissima), showing aggregate produced by parallel 



growth and twinning. 



14. Same, showing single crystals and twins. 



15. Same, showing aggregate group of twinned crystals in various aspects. 



16. Same, showing parallel growth and twinning. 



17, IS. Reduced Hemoglobin of the Shad, showing various aspects of simple crystals. 



