CLASSIFICATION OF ZOOPHYTES. 107 
* troid polyps, illustrate the same principles, and are as nearly allied to 
the Tunicata as the Rotifers to the Crustacea. It is a side-deve- 
lopement from the imaginary line, which connects the Infusoria 
with the Tunicated Molluscs. The Entozoa afford other examples, 
one branch of them passing into Crustacea, through the Lerneide 
and Caligide, and the other into the Annelida. ‘The Lerneoid divi- 
sion appears to reach the Polygastrics in the Acephalocyst. 
These remarks are intended to support no monad or Lamarckian 
theory, but only to elucidate the established principle that there are 
in nature certain distinct systems or types of developement. Each 
species is developed with some reference to one or the other of these 
systems, but, through the agency of the vital forces peculiar to it,— 
forces which, there is reason to believe, only creative power can change. 
107. In accordance with these principles, the several orders of 
animals may be arranged as follows : 
I. VERTEBRATA. 
Ill. Arrircunata. Il. Motiusca. 
Insecta, Myriapoda, Cephalopoda, Pteropoda, 
Arachnida, Gastropoda, Conchifera, 
Crustacea, Annelida, | Tunicata. 
' . 
1 N 
IV. Raprara. 
' ai Echinodermata, 
Rotifera, Entozoa, Zoophyta, Acalephe, Bryozoa. 
1 \ 
V. Prorozoa or Inrusorta. 
108. A radiated structure characterizes the simplest form of animal 
life.* Passing up from the monad globule, this structure has its 
* As suggested in the close of § 98, it appears to be more than a plausible conjecture, 
that we may attribute the radiated structure to the ordinary uncontrolled principles of 
cellule budding ; the results of which are seen in the varied forms of zoophytes and 
vegetation. It gives origin to the radiated form of the flower; and the spiral arrangement 
of the leaflets,—the result of a succession in the developements,—is one of the conse- 
quences of it (§ 86). The nervous system, in its lowest condition, conforms to this cha- 
racter ; but, as it becomes more perfect, it has a peculiar mode and direction of develope- 
ment,—as the zoophyte has its peculiar characteristics in this respect,—and thus developing, 
it guides all the other elaborations; for it seems to be the channel along which yital 
influences operate. The developement of nerves, therefore, carries the animal structure 
more or less widely from the radiate type. This is well illustrated in the relation of the 
Rotifers and Crustacea, the former, as shown above, having the general structure of the 
latter under a radiate form. The Rotifers have, as organs of motions, a series of plates 
arranged in a circular series around the mouth at one extremity of the animal. In the 
