24.0 E, RAY LANKESTER, 
ordinary chlorophyll corpuscles such as those of the leaves of 
plants. 
I consider that these coloured vesicles, which differ from the 
conception of “corpuscles” or ‘ granules” only in their 
relatively greater fluidity, are identical with the colourless 
‘“‘ Glinzkorper” (Greef) or refringent corpuscles of Pelomyxa 
palustris, as I have stated in a note to Gould’s paper on the 
structure of that Protozoon, published in vol. xxxvi of this 
Journal, 1894; and they all, no doubt, have an important 
chemical function in relation to the surrounding protoplasm. 
The colouring matters which develop in such vesicles appear to 
have a special character, and without necessarily agreeing 
exactly with what is called ‘“ chlorophyll,” are related to it 
and to such substances as diatomin, which accompany chloro- 
phyll in other more highly developed organisms. The 
colouring matter of Professor Bourne’s Pelomyxa viridis 
is clearly not simple chlorophyll, or if such chlorophyll is 
there it is mixed with other pigmented bodies. ‘The pre- 
dominant yellow-brown colour of the vesicles (granules or 
corpuscles) of the disc of Chlamydomyxa montana is 
suggestive of diatomin. Very possibly it masks chlorophyll. 
This is probable, because Archer represents his Chlamy- 
domyxa labyrinthuloides as containing vesicles like those 
in question, but coloured bright green; and further, because 
after encystation my C. montana undergoes the most re- 
markable changes in colour, developing a brilliant grass-green 
tint (in some examples), whilst accompanying this chlorophyll- 
like colouring matter there are always found in the cysts of 
C. montana irregular or central droplets of a brilliant crimson 
oily fluid, soluble in ether (see Pl. 15, figs. 8 and 9). 
Encysted Condition.—The cysts of Chlamydomyxa mon- 
tana closely resemble those of C. labyrinthuloides, as 
described by Archer and Geddes. ‘The substance of which the 
eyst-walls are composed yields the blue colour characteristic of 
cellulose when treated with H,SO, and iodine. The cysts are 
further remarkable in two features, and unlike the capsules 
usually termed ‘‘ cysts” among Protozoa. ‘They have (a) a 
