Habits of Anthophysa Miilleri. 435 
both the larger and smaller cilium scems to be undergoing a 
change, and becomes indistinct in outline*. Presently two larger 
flagella burst upon the view, apparently by the longitudinal 
splitting of the previously single one of the same kind, and rapidly 
separate from each other by the broadening of the body, and 
leave between them the smaller cilium. The latter at this time 
appears much thicker than usual, and seems to be composed of 
two closely approximated parallel threads. By this time the 
contractile vesicle has also divided into two, which lie closely side 
by side. 
At this moment the time noted in one series of observations 
was 2.30 p.m. By 2.85 p.m. the larger flagella had separated 
still further, and the smaller cilium had split into two very con- 
spicuous filaments, as yet, however, attached to a common point 
of the body. From this time forth to the completion of the 
process of fissigemmation all of the cilia kept up a slow vibra- 
tion, in which they undulated from base to tip with a sort of 
snake-lke motion. By 2.45 p.m. the body had become quite ap- 
preciably broader than long, the contractile vesicles were widely 
separated, and the smaller cilia had left between them a consi- 
derable space, and each one had approximated quite near to the 
base of a larger flagellum. At 2.50 p.m. the body had become 
nearly twice as broad as long, and the space between the two 
pairs of cilia was nearly twice as great as in the last phase, and 
considerably depressed in the middle, so that the body had a 
broadly cordate outline. By 2.52 p.m. the posterior end of the 
body (at a point a little to one side of the spot where it was 
* In a new freshwater genus (see note 2) of sedentary, monadiform 
Protozoa (possessing two contractile vesicles, and only the sigmoid flagellum, 
the latter arising within a deep bell-like flange or projecting rim which 
embraces the anterior end of the body) this arcuate filament disappears 
altogether, by a sort of withering down from tip to base, reminding one of 
the shrivelling of the end of a cotton thread in the flame of a lamp, pre- 
liminary to the commencement of the longitudinal fissigemmation of the 
body and its bell-like flange ; and then the new flagellum of each resultant . 
of self-divisicn grows out in about twenty minutes. 
2 Codosiga: kody, a bell, cvyde, to be silent. C. pulcherrima, n. sp. 
Body obliquely obovate, and tapering at its posterior end into a slender 
pedicel; truncate and abruptly constricted in front where the base of the 
bell meets the body. -Sigmoid arcuate flagellum as long as the body and 
bell. The two contractile vesicles in the posterior third of the body; 
superficial, large, and quite conspicuous, each contracting, alternately 
with the other, once in about half a minute. Bodies attached, in groups 
of from two to eight, by their pedicels to the tip of a slender stem ; erect 
or divergent, but not pendent. Mouth at the base of the fiagellum, 7. e. ter- 
minal. Anus near the mouth. No eye-spot. Bell slightly flaring ; half 
again deeper than broad ; fully as deep as the length of the body; highly 
contractile. Colour of the body (excepting the hyaline bell), pedicels, and 
stem deep yellow. Common on fresh-water weeds about Cambridge, U.S. 
