192 THE NORTHERN MICROSCOPIST. 
finely and coarsely granular, with corpuscles of varied character, 
ingesta of food, etc. Nuclei, and one or more pulsating vacuoles. 
Pseudopodia digitate, simple or branched.” 
Then follow minute descriptions of A. proteus, A. verrucosa, A. 
vradtosa, and A. villosa, with the measurements of each. 
Several pages are devoted to the general character of the 
Rhizopods, their food supply, and where they may be found. 
Their measurements are also given in micro-millimetres, which the 
author terms micras ; a #cra being the thousandth part of a milli- 
metre, is designated by the Greek p, and is equal to ~, of the 
English inch. 
The author tells us that Fresh-water Rhizopods are far more 
common in the ordinary collections of the microscopist than is 
generally supposed, but since they are seldom looked for they are 
often passed by unnoticed. He also tells us that in systematic 
collections the superficial ooze at the bottom of still water should 
be examined, after it has been allowed to settle for some time in a 
suitable vessel. Rhizopods are common in the slime of submerged 
rocks, stems, and leaves, especially so in moist Sphagnum ; they 
are to be found almost everywhere in moist situations not too much 
shaded, among decaying logs, mosses, lichens, and on the bark of 
trees. 
We hope by drawing attention to this little work (which may be 
obtained from the author at the address already mentioned, for 
three shillings and postage) that we have obtained some students 
for the Rhizopods; they are exceedingly interesting though too 
often neglected. 
Portfolio of Drawings and Descriptions of Living Organisms 
which have been sent out by THomas Botton, F.R.M.S. London: 
David Bogue. No. 5, 17 Drawings. 
This Portfolio, issued in June, 1881, contains illustrations and 
descriptions of— 
VEGETABLE KINGDOM. 
Protococcus pluvialis Batrachospermum. 
Vaucheria moniliforme. 
Fresh Water Algze. 
ANIMAL KINGDOM. 
Ophrydium longipes. Pterodina clypeata. 
Stentor polymorphus. Gammartrus pulex. 
Trichodina pediculus. Caprella lobata. 
Clava squamata. Alcyonidium polyoum. 
Syncoryne frutescens. Bowerbankia imbricata. 
Anguillula glutinis. Triticella pedicellata. 
Pedicellina cernua. - 
