150 FUNCTIONS AND INSTINCTS. 



Ammon ; and at a considerable depth in some 

 Siberian mines, in places entirely deprived of 

 light. 



He considers them, it should seem, as forming 

 a Sub-kingdom, which he denominates Plant- 

 animals. 1 This sub -kingdom he divides into two 

 Classes. The first, from the number of stomachs, 8 

 with which the genera belonging to it are fur- 

 nished, he names, Polygastrica, or many-sto- 

 mached, probably, to contrast with De Blainville's 

 name before-mentioned. The second class he 

 calls Rotatories, 3 consisting of the ciliated Polypes 

 of Lamarck ; 4 each of these classes he subdivides 

 into two parallel orders, the first containing those 

 that are naked, and the second those that are 

 loricated, 5 or covered with some kind of shell. 



In the first of these classes, the Polygastrics, 

 the animals recede further from the organization 

 of the higher tribes, and approach nearer to 

 that of vegetables ; but in the second, as I before 

 observed, rudiments of the organization of those 

 tribes make their appearance. Many of the 

 former are known to derive their nutriment from 

 vegetable substances, but what the majority 

 subsist upon is not certainly known ; but the 

 latter class, the Rotatories, are ascertained to be 

 predaceous, as above stated. Their mode of 



1 Phyto-zoa. 2 PLATE I. FIG. 1. 



3 Rotatoria, 4 PLATE I. FIG. 2. 



5 See Appendix, note 20. 



