248 NEWMAN ON THE 



3. IsoMOKPMA, in which all the stages are active and voracious, and 

 of similar forms. 



Besides these there is a fourth group, or rather there is a 

 class containing orders approaching all these divisions, besides 

 a typical order peculiar to itself. This heterogeneous group is 

 called Anisomorpha. 



It now remains to be seen whether this Metamorphotic 

 System, differing in every respect from either the Alary or 

 Maxillary, founded on a totally different basis, and offering a 

 trinary instead of dichotomous division ; it remains, I say, to 

 be seen, whether this system will at all invalidate the propriety 

 ofa circular and central distribution of thesevenclasses. Itshould 

 be observed that, although the terms and definitions in the 

 Metamorphotic System are proposed by myself, the system 

 contains no deviation from the system of Swammerdam, except 

 in a few minor points, to which I have previously alluded, 

 where his view is known to have been erroneous. 



The amorphous classes are Lepidoptera and Diptera ; the 

 necromorphous, Hymenoptera and Coleoptera ; and the isomor- 

 phous, Orthoptera and Hemiptera. Now, a single glance at 

 the diagram will shew how the Septenary arrangement of the 

 classes harmonizes with the great character of metamorphosis. 

 Where else than in the centre could that anisomorphous class 

 be placed, whose chai'acter, as defined by one of our profoundest 

 writers, is " varied metamorphosis." The diagram is thus a 

 third time divided by a genuine and perfectly natural character, 

 and now by a ternary and not dichotomous line A O E and A O L. 

 With respect to the contents of the anisomorphous class, it is 

 well known that the Ter-mitina and Perlina undergo a nearly 

 isomorphous metamorphosis ; the Pkrygaiiina are nearly amor- 

 phous; the Ephemet'ina ha.\e an anomalous metamorphosis, it 

 is true, but it is also true, and singularly corroborative of the 

 correctness of the situation which the Septenary System 

 requires that they should occupy, that this^ anomalous meta- 

 morphosis is precisely intermediate between that of the Libel- 

 lialina and that of the CvMcina. The metamorphosis of the 

 Panorpina appears to be unknown ; that of the Hemerobina 

 is necromorphous, thus indicating their proximity to the 

 Coleoptera. 



Having thus shown, and I trust I have shown, that the 

 Sf{)tcnary System is not only borne outj but in a great measure 



m 



