28 
POPULAR SCIENCE REVIEW. 
time, liave been very productive of good things. In the latter 
I have taken the pretty little house-builder, Mel i cert a ringens, on 
the finely-cut leaves of the water-crowfoot, as well as the still 
more elegant JMoscularia ornata, and the exquisite Limnias 
ceratophylli ; and, among the sediment, the long-legged Di.no- 
charis pociUmn, the thick-necked Notommata collar is, the tiny 
but active Diglena catellina, munching the half-decayed leaves 
and dropping its large eggs here and there, and the singular 
creature which 1 have described under the name of Diglena (?) 
birapliis. 
Wayside ponds I found productive. There is one near the 
turnpike-gate at Lower Clapton, which I often visited, and 
always with encouraging success. Among other tenants, it 
contained JEuchlanis lima , that form with the shell so singularly 
hollowed in front as to give it the shape of a crescent ; the 
jumping P oh/ art 1 i. ra p 1 atyp ter a, with its twelve jointed spears; 
several species of Brachionus , and an interesting little new 
genus, which I have called Pompliolyx. A pond at Tottenham- 
green, well stocked with the Lenina polgrh iza, or many-rooted 
duckweed, has given me some prizes. The first phial of water 
I carried home from this pool proved very turbid when examined, 
and appeared to contain no animal life ; but, after standing a 
week or two, it became clear, and was found to be densely 
swarming with the fine Brach ion us pa In, and another species which 
1 have named B. angular is. A broad pond in front of Forest 
School, at Walthamstow, has always been very rich in Rotifera. 
Thence I first obtained that large and brilliantly translucent 
species, Asplam ch na Briglitwellii, so singular in its structure and 
economy, which first made known to us the difference between 
the males and the females in this class of animals. Here, too, 
I found the elegant CEcistes crijstaUinus living in its pellucid 
tube affixed to the herbage ; Brachionus amplviceros, in- 
teresting for the clearness with which it has allowed me to 
understand some difficult points of structure ; the noble B. 
dor eas, a new species, with very long 1 anterior curving spines ; 
and, swimming at large in the open water, the crystalline 
M/nchceta pectinata, and the pretty little Anurcece, incapable of 
rest, because destitute of a foot. Hampstead Heath has always 
been a favourite resort with microscopists. A pond where 
horses are watered, and another just behind the Castle inn, are 
very productive of species; but tiny hollows on the Heath itself, 
many of them scarcely a yard in diameter, filled with a red- 
brown water strongly impregnated with iron, and completely 
dried up in hot weather, are unusually rich. In these, among 
many vegetable forms of much beauty and interest, I took the 
little Smphanops, with its arched helmet; the Gonochilos volvox, 
forming spherical groups united by the feet ; and an interesting 
