60 THE NORTHERN MICROSCOPIST. 
zoospores actually represent examples of the present cosmopolitan 
animalcule.” 
A very interesting feature in this part is the general description 
of the members of the order Choano-FlagellataS.K. On pp. 326- 
329 we have a resume of the author’s researches upon the use of 
the “collar” in these monads—from which it would seem “that in 
conjunction with the centrally enclosed flagellum it constitutes a 
most admirably formed trap or snare for the capture and retention 
of the animalcule’s food.” 
Several of these collared monads were shown in the plate 
accompanying our first number, notably Codosiga botrytis, which is 
described at some length on pp. 334-5. In speaking of the 
Salpingeca Boltoni the author refers to plate I of Tor NoRTHERN 
Microscopist, and says, “‘No fitter illustration of the abundant 
distribution of the flagellate infusoria can perhaps be cited than the 
drawing referred to, in which no less than three collared monads 
and two sedentary Pantostomatous species are, as observed by the 
author, grouped upon a small portion of a leaflet of AZyriophyllum 
spicatum.” 
There are two features in Mr. Kent’s work which strike us 
as being valuable to the majority of his readers. He gives the 
localities of many of the species: thus we learn Codosiga pyriformts 
“was found growing on the deserted polyparies of Hydroid 
Zoophytes and Polyzoa received from Brighton,” while AZonosiga 
consociatum was found “upon the carapace of a species of Cyclops 
taken from a mill-pond in St. Peter’s Valley, Jersey.” The other 
feature is that of measurements, which gives the microscopist 
something of a guide as to what power he may use for observation. 
It will be seen that the majority of the species herein described 
are exceedingly minute and so require high powers; Jonosiga 
ovata measures 249 tO 5000 Of an inch in length, and Heteromita 
Zens is similar in its dimensions. Such infusoria as these require at 
least an eighth objective to see them with any degree of satisfaction. 
This part of the work will be especially useful to those who may 
be studying microscopically solutions of decomposing substances 
both animal and vegetable. 
The London Catalogue of British Mosses and Hepatics. Pub- 
lished under the direction of the Botanical Record Club. Second 
Edition, 1881. London: David Bogue. 
TueE Botanical Record Club has for its objects, the verification, 
registration, and publication annually of matter relating to the 
distribution of British Plants, as may be furnished for that purpose 
by the members, or as seem to merit publication, either on account 
