ZOOLOGY. 585 



nose, and the body consequently a myelon or spinal chord, 

 they would then be Fishes. 



SECOND CIRCLE. RESPIRATORY, CUTANEOUS ANIMALS 

 ANCYLIOZOA. 



3501. Body annulate. 



Here range the Worms, Crustacea, and the proper 

 or volant Insects. 



3502. In this circle a remarkable relation is revealed, 

 If, namely, its classes, orders, and families be compared 

 with those of the two preceding circles, it is then dis- 

 tinctly shown that the present one again commences quite 

 from below, ascends parallel with both these, and trans- 

 cends them in its highest inmates or members. 



As an example of the first case, the imperfect condition 

 of some Entozoa, and their great resemblance to Infu- 

 soria, is sufficiently expressive. 



The Worms evidently pass parallel to the Mucus - 

 animals, and the Entozoa indeed to the Infusoria, the 

 Red-blooded Worms to the Polyps, but the Holothuriae 

 chiefly to the Acalephse, near which they are still arranged 

 up to the present day, although they are articulated, and 

 have an intestine and vessels. 



Thus this class traverses the three inferior classes, and 

 consequently imparts to them only the value of orders, or 

 must itself be raised only to the rank of an order, a step, 

 however, which, considering the great number of Worms, 

 would not be suitable or just. The names may therefore 

 remain for the sake of uniformity ; only it must be borne 

 in mind that they are of unequal value. 



The same relation is exhibited in the Crustacea or 

 Crabs. They obviously admit of being parallelized with 

 no other animals than the Malaco- or Conchozoa. The 

 Entomostraca and Crabs evidently repeat the Mussels, 

 the Aselli the Snails ; but the Spiders and Scorpions the 

 Kracken or Cephalopoda. Consequently here also the 

 orders correspond to the preceding classes. 



The true or proper Insects transcend the Sexual animals, 

 and therefore conform to the classification of their own 



