364 MR. 8. LE M. MOORE'8 STUDIES 
mentioned by Kuetzing* and also figured by that author; and 
we find Freseniust, a few years after Naegeli, giving a short 
account of the ciliated form, which he was the first to discover in 
Germany—it was originally lighted upon at Zurich. Fresenius 
distinguishes under the name of A. minor a form which he found 
on a species of Mougeotia; it is less markedly pyriform than 
Apiocystis Brauniana, is paler green in colour, it usually con- 
tains but one gonidium, and has a darkly-contoured granule 
(Körnchen) which he compares with the red spot of some Aloe; 
moreover it possesses a contractile vacuole. I have found no 
other floristie reference to Apiocystis in continental literature. 
It was discovered in this country by Henfrey $ among some 
Alge brought from Wimbledon; and Mr. A. W. Bennett $ has 
announced its occurrence in Cornwall Strangely enough, it 
turns up in New Zealand, where it was found by Berggren 
growing upon Vaucheria threads ||. Apiocystis would thus appear 
to be a widely distributed, but at the same time extremely local, 
type. 
Description of Apiocystis. 
Fig. 1 of Plate LIV. represents the earliest stage of the ciliated 
form—an attached pyriform sae with its biciliated gonidium, the 
strong cilia reaching far out into the surroundiug water: in fig. 2 
the gonidium is shown divided in a plane at right angles to the 
growth-axis, and the proximal gonidium has thrown out a pair of 
cilia similar to those of its distal fellow. Upon this point my 
experience is at variance with that of Naegeli and of Fresenius, 
both these authors describing the first division as taking place in 
the longitudinal plane, a condition of things seen by me but 
onee out of many score speeimens. Division of the two 
gonidia of fig. 2 gives us the four gonidia of fig. 3, each goni- 
dium provided with a pair of long cilia: by further division the 
stage represented in fig. 4 is reached. If figs. la, 3, and 4 
are compared with figs. 1b and 2, much difference will be noticed 
* Species Algarum, p. 208, and Tabulze Phycologicse, vi. tab. 68. 
f Abhandl. Senckenb. Naturforsch. Gesell. Band ii. p. 237, tab. xi. 
figs. 1-20. 
1 Quart. Journ. Micros, Sc. 1856, p. 52. 
$ Journ. Roy. Micros. Soc. 1887, p. 9. 
|, See Nordstedt’s * Freshwater Alge collected by Dr. S. Berggren in New 
Zealand and Australia, 1888. 
