Royal Microscopical Society. 169 



and in separating therefrom, and severally disposing of the particles 

 so selected for alimentary or building purposes, and in rejecting 

 others for the time being, which are brought again and again under 

 the influence of the marginal wreath by means of the cements which 

 that creates. 



Dujardin's classification embraces each of the members of the 

 foregoing Division, both Fixed and Feee, but it includes a form 

 which is not loricated, viz. Ftygura ; this, however, could not be 

 admitted, as its identity as a mature animal is doubtful. 



We find, however, that abnormal conditions obtain with certain 

 members of the Solitary Fixed Division, which normally are 

 permanently attached, particular instances occurring in respect to 

 Floscularia and CEcistes, which under such conditions occasionally 

 forsake their first-selected habitats, and resort to foreign ground, 

 where they re-establish themselves, and construct anew their so- 

 called lorications, simply gelatinous or floccose, according to their 

 respective characters ; but whether these abnormal conditions are 

 accidental or natural I have some hesitation in declaring ; I consider 

 it, however, worthy of note, for we shall see as we proceed that 

 such a capacity in these forins associates them closer than hitherto 

 acknowledged with certain members of SECTION II. 



Each individual of the Fixed Division is furnished with tivo 

 setigerous antenna, situated bilaterally, but not diametrically oppo- 

 site ; hence the great difficulty in arranging animals for observation 

 precisely in such a position that they can be viewed without the 

 interposition of some other part of the body, and not even then 

 with inferior appliances, either mechanical or optical; but with 

 good apparatus and patient application they are to be found in one 

 and all : they are clearly apparent in F. coronetta (mihi), as also in 

 Stephanoceros, and familiar to all observers in Melicerta. It must 

 therefore be distinctly understood and accepted that no Eotifer 

 exhibiting a single setigerous antenna can be admitted as a member 

 of the Fixed or of the Free Division of the Loricated Families of 



the KOTATORIA. 



It now becomes necessary to distinguish certain members of 

 SECTION II. of the CLASS KOTATOKIA, the so-called Illori- 

 cated Family Philodin^a, which by their peculiar habits and 

 structure form a connecting link, hitherto unrecognized between 

 this Family and those of SECTION I. previously referred to-; for 

 our present purpose, therefore, we must separate these also into 

 two Divisions, which may be designated the Temporarily Fixed 

 and the Absolutely Free, this last being only represented by 

 Hydrias, Typhlina, and Monolahis, which under a new classification 

 should bo included with the numerous members of the following 

 Famihes, — HydaUnisea, Euclanidota, and Brachionaea, the Flexible 

 Creepers of Gosse. 



