- "NATURAL SYSTEMS. — MACLEAY’S. 217 
be uninteresting to science. To the student we feel 
assured it will be acceptable ; since no one has yet at- 
tempted to place the subject in a clear light ; and the 
Hore Entomologice is now so scarce, that few can hope 
to consult its philosophic pages. We have also felt 
desirous to place the value of Mr. MacLeay’s discoveries 
in their true light, and clearly to explain those funda- 
mental principles of the natural system which he has 
the high and undoubted honour of having discovered. 
How far he may have been successful in the application 
of these principles, belongs not to our present enquiry, 
which regards the principles of natural classification, not 
the results of their application. 
(268.) In connection with the denomination or rank 
assigned by Mr. MacLeay to some of his groups, a few 
remarks are necessary, as they are not considered by him 
in the same uniform light. In some of the diagrams 
he has given to explain the affinities of the annulose 
animals, the very same group which is called typical in 
one, is made aberrant in another. Thus, on turning 
to the diagram of the Annulosa*, we find that the Chilo- 
poda and Thysanura are typical groups: but in the 
diagram of the Mandibulata, the denomination and situ- 
ation of the Thysanuriform type are changed ; it is no 
longer typical, but aberrant ; while the Chilognathiform, 
placed at p. 390. as aberrant, is now made typical : 
this, of course, brings with it a complete change, not 
only in the smaller circle which contains these types, 
but in the situation of every other in these two dia- 
grams. As nothing, so far as we can discover, is stated in 
explanation of these contradictory denominations of the 
same groups, we can only account for it, either by sup- 
posing Mr. MacLeay not to have then discovered that 
the same group which was external or typical in one 
circle, was also external in another,—or that, in the 
eager and natural desire to make good his circle of the 
Annulosa, he overlooked this transportation of his groups. 
Certain, however, it is, that this oversight has not only 
* Hor. Ent. p. 390. 
