Monthly Microscopical"] 
Journal, April 1, lt;69. J 
( 245 ) 
NEW BOOKS WITH SHOET NOTICES. 
Transactions of the Linnean Society of London. Vol. xxvi. Part 
Second. London : Taylor and Francis. — This part is entirely 
occupied by Mr. G. S. Brady's splendid ' Monograph of the recent 
British Ostracoda.' The account of these Crustacea which Mr. 
Brady has given extends over nearly 150 pages 4to, and is ac- 
companied by fifteen 4to plates containing each an average of fifty 
beautifully drawn figures. He adopts Sar's method of classify- 
ing the Ostracoda, and divides them, therefore, into (1) those in 
which the lower antennae are two-branched, and (2) those in which 
they are single. The former are again sub-divided into those (a) 
in which one branch is rudimentary; those (6) in which both 
are developed and natatory ; and those (c) in which both are flat- 
tened. The first division he terms Podocopa, and the three others 
Myodoco]pa^ Cladocopa, and Platycojpa respectively. He gives the 
following typical areas of distribution : — 1. The Arctic type, in- 
cluding all species which attain their greatest development north 
of the isothermal line of 32° Fahr. 2. The Scandinavian type, 
comprehending the seas of Iceland, Norway, Sweden, Denmark, 
Shetland, and Northern Scotland. 3. The British type, in- 
cluding the species distributed pretty generally in the seas of Great 
Britain. 4, The Atlantic type, including the species which reach 
their greatest luxuriance on the south and south-western shores of 
England and Ireland. 5. The Mediterranean type, including 
species which attain their maximum development in the Mediter- 
ranean. He admits that this scheme is imperfect, but considers it 
better than none at all. As to the manipulation of these auimals, 
and their preparation for the microscope, Mr. Brady states, " It is 
seldom that much difficulty will be experienced in separating the 
valves by means of fine needles, and then detaching the contained 
animal ; the various organs are rendered much more distinct by 
immersion for a short time in a solution of potash, by which the 
oleaginous and granular constituents are to a great extent re- 
moved, the chitinous structures remaining unaffected. If it be de- 
sired to mount permanently the dissection thus made, the best 
medium for the purpose is a compound of glycerine and gelatine, 
with a slight addition of arsenic," the formula for which is given 
in Dr. Carpenter's treatise on the Microscope (3rd edition, p. 775). 
The depths at which certain species have been dredged are generally 
stated, and an useful bibliography is appended. This monograph 
of Mr. Brady's affords a fine field for the microscopist in search of 
work. 
Das Hemmungsnervensystem des Herzens Ein verglelchend physiologiscJie 
Studie, von Dr. Adolph Bernhard Meyer. Berlin: Hirschwald, 
1869. — This is a very important report of a great number of ex- 
periments in reference to the innervation of the heart, and the 
