112 
EE VIEWS. 
divisions, the first of which includes the eight orders of winged insects : 
the last contains bnt one order, Aphaniptera. This last division is cer¬ 
tainly a needless one, for it would have been more correct to have referred 
the Aphaniptera to the Diptera. Mr. Dallas, however, further on, states 
that this is the opinion of many entomologists. Th e Mailophaga are here 
regarded as a distinct order. 
The account of the class Myriapod a occupies little more than five 
pages. Nothing is here said concerning the late Mr. George Newport’s 
valuable researches concerning the development of these animals ; and 
we cannot but consider this omission as a serious deficiency. The Arach- 
nida are described at somewhat greater length. The Crustacea are sub¬ 
divided into six sub-classes—namely, Podophthalma, Edriophthalma, 
Xiphosura, Entomostraca, Cirrhopoda, and Araneiformia. The proper 
place of the last-mentioned group (= Pychnogonidse) would seem to be 
among the Arachnida. Mr. Dallas, indeed, though placing them among 
the Crustacea, alludes to the difficulty of assigning their true position. 
The sub-classes Podophthalma and Edriophthalma are more generally 
regarded in the light of primary divisions of one larger sub-class, Ma- 
lacostraca; and until additional light can be thrown on the true affinities 
of the Trilobites, it would be, perhaps, the best course to constitute a 
separate sub-class for this remarkable group,—a rank, moreover, of 
which they seem to be not unworthy. 
An abstract of Milne Edwards’ conclusions in regard to the geogra¬ 
phical distribution of the Crustacea concludes the account of the Arti- 
culata proper. This, however, is simply copied from the first edition. 
Here also, we think, might with advantage have been introduced a 
general comparison of the four articulate classes, giving a concise sum¬ 
mary of the more important distinctions which separate them from one 
another, explaining also their mutual relations and the homologies of 
their various parts. This, we regret to say, the editor has not given; 
thereby neglecting to furnish the student of this branch of zoology with 
a help which no educational treatise has hitherto supplied. 
The several classes of the division Annuloida are described in a brief 
and unsatisfactory manner; very many interesting points in connexion 
with their history being left untouched. Almost nothing is stated with 
reference to the development of the Rotifera, nor are the curious affini¬ 
ties which this class bears to allied groups properly discussed or eluci¬ 
dated ; and yet there are few questions in zoology capable of being made 
so interesting and instructive to the student. 
We have been much disappointed with that portion of the present 
volume which professes to treat of the sub-kingdom Mollusca. The editor 
seems to have availed himself but little of the numerous additions which 
have recently been made to this branch of zoological literature. The 
valuable observations contained in Professor Huxley’s papers on the 
Morphology of the Cephalous Molluscs and on the Structure of the Tu- 
nicata, published, we need hardly inform our readers, some years since, 
in the “ Philosophical Transactions of the Royal Society,” are not even 
alluded to by Mr. Dallas. Not a word is said concerning the affinities 
