118 
REPORT ON ZOOLOGY, MDCCCXLII : 
already been mentioned in the previous report, twelve numbers 
have now appeared, which conclude the work. 
There are 300 neat copper-plates in all, with 1500 figures. The hook 
contains, with a few exceptions, most of the genera hitherto described. 
It is particularly to be recommended in the study of the Mollusca, from 
the fidelity of the drawings ; although it cannot be concealed, that the 
arrangement and view of the genera do not always correspond to the 
present standard of science. It would be too long to cite here all the 
misconceptions of this sort ; but the arrangement of Littorina, Scalaria, 
Turritella, and others in the family of Turbinacece ; of Natica in that 
of the Neritacew ; of Ampullaria in Peristomata (Paludina and Val- 
vata), &LC., may serve as examples. In illustration of the false limits of 
genera, the connection of Physa, Limnceus, and Amphipeplea, in 
one genus, may be adduced. Here and there, too, a species falsely 
defined is met with ; for certainly the shell figured as Ampullaria 
rugosa, Lam. {Nerita urceus, Miill.), is not that species, but rather 
A, glohosa, Swains. The first five numbers form the first volume, and 
contain the Cirripeda and Bivalves. The remaining seven contain the 
rest of the Mollusca, and form the second volume. Ehrenberg’s Poly- 
thalamia (Foraminifera of D’Orbigny) are joined to the Cephalopoda ; 
but only five genera are figured as types of the difiPerent forms. Several 
new species are incorporated in the work, which is particularly impor- 
tant on this account, as they have already been defined in the Proceed- 
ings of the Zoological Society. 
One number, the fifth of the second volume, of the long in- 
terrnpted Iconographie der Land imd Siisswasser Molliisken, 
von Rossmassler, has appeared in 1842. 
The first plate contains species of the genus Helix ; the second of 
Clausilia ; the third of Pupa ; the fourth and fifth of Anodonta and 
Unio. Many species are new. In the preface, the author promises that 
the twelfth number shall conclude the second volume ; and then there 
will appear a “ Fauna Molluscorura Extramarinorum Europas,” in 
which he will arrange, systematically, the collected materials. We hope 
he may soon make good his promise. 
During the year 1842, two numbers, the fifth and sixth, 
have been added to Hartmann’s Erd imd Siisswasser Gaste- 
ropoden. 
In the fifth number, species of the genera Helix, Neritina, and Lim- 
mvus, with varieties and monstro.sities, are figured. The author also 
adds exotic genera, viz.. Helix [Chromocochlea), Twrhinoides, and 
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