75 



the Polygastnca there is an analogous multiplication of the digestive 

 cavity itself; the generative system becomes the subject of this re- 

 petition in the Taniee, each joint being the seat of a separate ovary; 

 and the Sponges, which exhibit in their calcareous and siliceous spi- 

 cula the first rudiment of an internal skeleton, repeat again and again, 

 without modification, in the same individual the same spiculum. The 

 Acrita offer, as it were, the germs of the higher animal forms, and 

 sketch forth the ideas of the typical condition of the principal sub- 

 divisions of the animal kingdom. 



As classes of Acrita Mr. Owen proposes to regard the Polygastrica, 

 the SpongicE, the Polypi, the Acalephm, and the Vers Intestinaux Pa- 

 renchymateux of Cuvier, for which latter he proposes the name of 

 Sterelmintha. 



Among the Radiata, for which he uses the name Nematoneura, he 

 includes the Echinodermata and the Rotiferu, together with the Vers 

 Cavitaires of Cuvier ; which latter he subdivides into the Epizoa and 

 the Ccelelmintha, a term proposed by him to comprise all the Nema- 

 toidea, together with the genera Linguatula and Sipunculus. 



He passes in rapid review the several systems of the Ccelelmintha, 

 and remarks on the generative functions, that the same variations 

 which are met with in the Sterelmintha occur in this series also. We 

 have the simple female apparatus without male organs, or the crypt- 

 androus type, in Sipunculus ; the superadded male glands, but 

 without reciprocal fecundation, in Linguatula ; and the separate sexes 

 in the Nematoidea. 



In conclusion, Mr. Owen gives the following list, distributed ac- 

 cording to his views of the 



Entozoa Hominis. 



Subregnum Acrita. 



Classis (Infusoria, Cuv.). 



1. Cercaria Seminis cui locus Semen virile. 



2. Trichina spiralis Musculi voluntarii. 



Classis Sterelmintha. 



3. Echinocercus Hominis Hepar. 



4. Cysticercus CellulostB Musculi et cerebrum. 



5. visceralis Viscera generatim. 



6. Tania Solium Intestina tenuia. 



7. Bothriocephalus latus Intestina tenuia. 



8. Polystoma Venarum Vense. 



9. pinguicola Ovaria. 



10. Distoma hepaticum Vesica fellea. 



