298 DR. C. A. MAC MUNN ON MYOELEMATIN AND THE HISTOHH3 MATINS. 
Sp. 16. Myohsematin in the spider— Tegenaria civilis. 
Sp. 17. Do. in the heart of Astacus jluviatilis. 
Sp. 18. Do. in the heart of Cancer pagurus. 
CHART IV., Plate 12. 
Sp. 1. Myohsematin in the heart of Homarus vulgaris. 
Sp. 2. Do. in the heart of Limax fl-avus. 
Sp. 3. Do. in the pharyngeal muscles of same. 
Sp. 4. Do. in both situations in Arion ater. 
Sp. 5. Do. in the heart of Helix aspersa. 
Sp. 6. Do. in the heart ventricle of a mackerel (Scomber). 
Sp. 7. Do. in the heart of Rana temporaria. 
Sp. 8. Do. in the heart of Bufo vulgaris. 
Sp. 9. Do. in the heart of a Trionyx. 
Sp. 10. Do. in the heart of Lacerta viridis. 
Sp. 11. Do. in the heart of snowy owl ( Nictea nivea). 
Sp. 12. Do. in the heart of a Guinea-pig. 
Sp. 13. Do. in the heart of a Hare. 
Sp. 14. Do. in the heart of a Dog. 
Sp. 15. Do. in the heart of a Rat. 
Sp. 16. Do. in a muscidus papillaris of human heart. 
Sp. 17. Isolated myohsematin in muscle plasma. 
Sp. 18. Changed myohsematin isolated by pepsine, in water, treated with NII 4 HS. 
