70 NATURAL ARRANGEMENT OF INSECTS. 



pillars having the long cylindrical body of the intestinal 

 worms, the entomologist must be reminded of the larvte 

 of the Linnican Geometria, now called the true moths 

 [Phal(P7iides), where we find the longest caterpillars in 

 the whole order of Lepidopfera ; just as the Vermes, and 

 their representatives, are the longest of all annulose 

 animals. There now remains but one division in each 

 group to be compared, and these are the Anopluriform 

 caterpillars and the Cirrhipedes, or barnacles. These, 

 it will be remembered, stand at the extreme confines of 

 their own superior groups; the Hesperian butterflies 

 being the last of the Papiliones, and the barnacles the last 

 of the Annulosa. In such extreme groups, the analogies, 

 also, are always the most remote ; nor can we expect to 

 (race any thing in common, as regards absolute struc- 

 ture, between the form of an anopluriform caterpillar 

 and barnacle : but when we reflect upon the habits of 

 these two very dissimilar tribes, we are immediately 

 struck with the beautiful method by which Nature has 

 intended that they should represent each other. The 

 " truly natural character," as Mr. MacLeay observes of 

 the Cirrhipedes, " is that vegetative quality by which 

 they are rendered incapable of locomotion ; " while it 

 may with equal truth be said, that the most striking and 

 universal peculiarity of anopluriform caterpillars consists 

 in their always remaining, as it were, sedentary : they 

 spin themselves up in a leaf, which (apparently at least) 

 they never quit ; and in which they change into the 

 pupa. So far, therefore, they have nearly as much of 

 that " vegetative quality," when we compare them with 

 all the other types of larvje, as have the Cirrhipedes. 

 Both, in short, are modifications of the apodal larva;, 

 and may be described as truly sedentary, or living in 

 one place. We have intimated, that it would be almost 

 impossible to discover the most remote analogy between 

 the form of a barnacle and an anopluriform larva ; but 

 there is a very curious coincidence in the general ap- 

 pearance of the two animals, which may be here men- 



