H. J, Clark on Anthophysa Miilleri. 229 
idly 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 
30 P.M. By 2.35 p.m. the larger flagella had separated 
still farther, 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-like motion. By 2.45 p.m. the body had become quite ap- 
of constriction. Still the process went on very rapidly, and by 
2.55 P.M. the new bodies were widely separated, but still attached 
to each other by a mere thread. At 3 P.M. the body which was 
attached to the pedicel was left alone, and its companion swam 
away to seek a new attachment, and build up its stem. 
To the last moment the hyaline envelope remained about the 
Segments, and in fact so long afterwards that time and circum- 
Stances did not allow me to ascertain its final disposition. EI 
would remark, however, that when the ovate bodies of the half 
grown monads are contracted temporarily into a globular shape, 
they appear identical—excepting that they lack the hyaline en- 
Velope—with these recently fissated forms. In all probability, 
therefore, the latter lose their envelope and assume the shape of 
rmer. 
Aa. Jour. Sc1.—Secoxp Serigs, Vou. XLII, No. 125.—Sept., 1866. _ 
30 
