DR. C. A. MAC MUNN ON MYOHSEMATIN AND THE HISTOHHLMATINS. 287 
In the flexor and extensor muscles of thigh, I could only find oxyhaemoglobin, in a 
muscle in front of pubis myohsematin, in flexor muscles of forearm myohsematin, in 
biceps and pectorals myohsematin and oxyhsemoglobin, in calf muscles traces of 
myohsematin, in those of tail only oxyhsemoglobin, in triceps and other extensors of 
arm myohsematin and oxyhsemoglobin, in dorsal muscles only oxyhsemoglobin, and in 
depressors of inaudible oxyhsemoglobin. In a second specimen the distribution was not 
quite the same, thus the tail muscles showed myohsematin, the flexor muscles of arm 
myohsematin and traces of oxyhsemoglobin, the same in its extensors; in flexors of thigh 
myohsematin and oxyhsemoglobin, anterior muscle of leg the same, in calf muscles 
myohsematin and oxyhsemoglobin, in mylohyoid both pigments, in thoracic intercostals 
only oxyhsemoglobin, in dorsal muscles both pigments, in tail muscles both pigments. 
This last lizard had its vessels injected with salt solution which partially accounts for 
the differences noted. (See spectrum 10, Chart IV.) 
In Emy.s Europcea myohsematin was found in auricle and ventricle, in the pectorals, 
in dorsal muscles traces mixed with oxyhsemoglobin, in tail muscles oxyhsemoglobin, 
the same in pelvic muscles, both pigments in the flexors and extensors of arm, and in 
the flexors and and extensors of leg. 
In Lacerta agilis myohsematin is well marked in the ventricular muscle, and in the 
biceps of arm ; the redder parts of the flexors of forearm show the presence of oxy¬ 
hsemoglobin, the paler myohsematin ; in the extensors only myohsematin, the pectorals 
myohsematin, in flexors of leg myohsematin, the same in calf muscles, pelvic muscles 
traces of the same, muscles of tail oxyhsemoglobin and myohsematin, dorsal muscles 
traces of myohsematin, mylohyoid myohsematin, and this pigment occurs well marked 
in the tongue muscles. 
In Scincus officinalis myohsematin is present in auricle and ventricle ; and in the 
pectorals mixed with oxyhsemoglobin, in the triceps both pigments occur, in the tail 
muscles oxyhsemoglobin principally. In other muscles the distribution is much the 
same as in the above species. In Tropidonotus natrix the myohsematin bands of 
auricles and ventricles give the following readings :— 
1st band . . . X 613 to X 593, 
2nd band ... X 569 ,, X 563, 
3rd band . . . X 556 „ X 550, 
4th band ... X 532 ,, X 513. (?) 
The same bands are well marked in the tongue muscles; in the mylohyoid and other 
muscles of mandible myohsematin and oxyhsemoglobin are found, the latter, too, 
principally in the dorsal muscles and intercostals. 
In a black snake ( Bascanium constrictor f) the same bands can be seen in the ventricle 
and auricle, in the muscles along the body both pigments occur, also in the depressors 
of the lower mandible, in the dorsal muscles, and in the intercostals. The bands of 
myohsematin are badly marked in all these voluntary muscles. 
