138 ACALErilS IN GENERAL. Part I. 



correctness. His views respecting some of the animals referred to tlie class of 

 Acalephs, which he would remove from it, exemplify this disposition of his ; and 

 the many unnecessary changes which he made in the nomenclature of the lower 

 animals are another evidence of that ruihajipy propensity. There are few examples 

 of a more appx'opriate name for a new class in the animal kingdom, than that of 

 Acalepha3, selected Ijy Cuvier to designate, in general, all the animals allied to 

 those known by the ancients under that name. It was at once adopted by all 

 naturalists. The most important work ever puldished upon this class, as a whole, 

 bears that name upon its very title ; and yet DeBlainville does not hesitate to 

 substitute for it a new, ill-sounding name, Arachnodermaria, the meaning of which, 

 if it suggests any thing, recalls affinities with another type of animals, with which 

 the Acalephs have no affinity. 



CLASSIFICATION OF OKEN, 1835. 



The views held by Okeii iH)ou classification and the allinities of animals have already been presented 

 in my first volume (p. 212). It remains only to give a special account of his arrauLTcment of the animals 

 belon<i;ing to the tj'pe of Radiata. Oken does not unite the Echinodenns with the other radiated animals; 

 but, founding upon the manner in which the parts of their solid envelope are movablj' united, and also 

 upon the worm-like form of the Ilolothuria", unites them with the Articulates, in one and the same class 

 with the Worms, as a distinct order of that class. The Acalephs are united, with the Polyps and 

 Infusoria, into another primary division, the Intestinal animah, divided into three classes : the Infusoria, 

 as Stomach-animals ; the Polyps, as Intestine-animals ; and the Acalephs, as Lacteal-animals. The class 

 of Acalei)hs is itself subdivided into three orders : — 



1st Order. The Infusorial Acalephs, or Siphonoplioras. 



1st Tribe. Diidiyes, Calpe, Abyla, Cymba, Aglaisma, Eudoxia. 



2 J Tribe. Rliizophysa, Stephanomia, — Physophora, — Physalia. 



3d Tribe. Porpita, Lithactinia, Rataria, Velella. 

 2d Order. The Polypoid Acalephs, or Cteno)diora\ 



1st Tribe. Eucharis, Cydippe, — Idya, — Medea, Pandora. 



2d Tribe. Mnemia, Callianira, Cesium. 



od Tribe. Axiotima, Calymma, Alcinoe, Ocyrhoe. 

 3d Order. The Acalephs proper, or DiscophorK. 



1st Tribe. Eudora, Berenice, — Geryonia, — Rhizostoraa, Cassiopea, Cephea. 



2d Tribe. Phorcynia, Melicertum, Thaumantias, Oceania, Callirhoe — ^quorea, — ^-Egina, 

 Cunina, Polyxenia. 



3d Tribe. Ephyra, — Aurelia, — Pelagia, Chrysaora, Cyanea. 



This classification may be considered as a remodelling of Eschscholtz's, adapted to the views of the 

 author respecting the manner in which the structure of the higher animals is represented by indejiendent 

 beings, — recalling, as it were, the different systems of their organs. 



