52 _ The Progress of Zoology. [Jan., 
and to this conclusion he is led by his researches. The very curious 
investigations made by Dr. Hansen upon the auditory organs of the 
Decapod Crustacea, and the remarkable researches of Fritz Miller 
on Penzeus, as well as some other of the interesting questions of 
crustacean metamorphoses, are very fully noticed by Mr. Spence 
Bate, and these abstracts of valuable papers very much add to the 
interest and utility of the record. Each division of the Crustacea 
appears to have been well represented by various investigators, the 
Cirripeds haying perhaps received least attention. 
Nearly one half of the Zoological Record is taken up by the 
laborious and careful account of the literature of the Arachnida, 
Myriapoda, and Insecta, prepared by Mr. W. 8. Dallas, of York. 
We must congratulate the editor upon having secured the services 
of so careful and painstaking a coadjutor, for the labour exhibited in 
this part of the’ volume is truly immense, and the result of great 
service to the crowd of entomologists who appear to number in 
proportion to the host of imsects upon which their attention is 
concentrated. This is a fortunate circumstance or otherwise the 
arrears of insect literature would be enormous, and Entomology 
would fail to keep pace with the other branches of Zoology. It is 
in this department, however, that the descriptions of species, and 
the minute attention to specific differences, preponderate over the 
more comprehensive views of material relations, and those zootomic 
studies which characterize the researches of most other zoological 
investigators ; not, however, that philosophic entomologists are want- 
ing—we should be sorry to imply that—but the tendency of the 
exclusive study of entomology appears to be the development of that 
microscopic eye which can readily detect minute shades of colour 
and variations of form, and which is useful in its way, although not 
of the highest character as an intellectual effort. We cannot there- 
fore, owing to the great mass of material, here attempt to give 
anything like a general view of the researches made in Entomology 
proper, but will content ourselves with saying that a vast number 
of new species have been added to the lists, a great many new 
genera formed, and Entomology in general as a science considerably 
advanced. ‘The various departments of Coleoptera, Hymenoptera, 
Lepidoptera, Diptera, Neuroptera, Orthoptera, and Rhyncota have 
each received a fair share of attention. Among the students of 
Arachnida our own countryman, Blackwall, occupies a prominent 
place, whose “ History of the Spiders of Great Britain and Ireland ” 
is the most noticeable contribution of the time. 
The remainder of the articles in this ‘ Record’ are comparatively 
brief, although by no means on that account unimportant. Mr. J. 
Reay Greene supplies the Rotifera and Annelids. Two papers 
only occur in the former, of which summaries are given; but the 
Annelids are, as might have been expected, better represented. 
