320 A. C. Stokes—Fresh-water Infusoria. 
monas, but the other characteristics are so marked that it would 
seem preferable to slightly modify the generic diagnosis rather 
than to institute a new genus for its reception, 
The dark-bordered corpuscles so numerous within this and 
C. paramecium, are of an amylaceous nature, as is proved by 
their change to an intensely blue color when the animalcule is 
killed with iodine. he nucleus is usually so completely 
hidden by these superposed starchy corpuscles that it is posi- 
tively located with difficulty. In several individuals, however, 
these bodies have chiefly collected in the anterior portion 0 
the zooid, in which cases what I have taken to be the nucleus 
has been left in an almost subterminal position. The mature 
animaleule is shown in fig. 
Reproduction is accomplished by conjugation followed by 
encystment and quadruple subdivision. Union takes place by 
the adhesion of the two frontal borders, the body contents of 
one animalcule slowly passing into and mingling with those of 
the other, the latter gradually assuming a spherical form an 
exhibiting four actively moving flagella, as in fig. 9. That the 
zooids possess a distinct cuticular investment is proved during 
this process of protoplasmic transfer, for at that time, as shown 
in fig. 10, the posterior portion of the cuticular coat is left 
e after 
tirel 
sphere, becomes the cyst wall within which quadruple division 
takes place, the four young zooids thus formed differing from 
the mature infusorian apparently in size only. 
In a single instance, previous to the union of the frontal bor 
ders, the four flagella became fused into two, after which I sup- 
pose the reproductive process proceeded as just described, but 
as I neglected to supply the water lost by evaporation from be 
ro 
neath the cover glass, the advancing wave swept them f ; 
field and they were lost. Conjugation and encystment pe 
been observed in the other species of the genus, longitudin: 
] 
tission prevailing generally. 
Loxophyllum flexilis, sp. nov. 
three 
Body irregularly ovate, lanceolate or sub-triangular, a 
times as long as broad, transparent, lamellate, very 
