344 



C. T. HUDSON. 



of both rows; but in Conochilus all this is reversed; the row 

 of larger cilia encloses that of the smaller ones, the mouth, and 

 also the antennae. 



Ehrenberg's next great group, the Sorotrocha, with its 

 divisions and subdivisions, is more successful; for the trochal 

 discs have to a considerable degree the characters assigned to 

 them, and the " loricated " families really have loricse. The 

 families too are in the main natural ; and two of them, viz. the 



Fig. 13 



_j3A 



Iroseola. 



Fig. 13. — a. Principal ciliary wreath, b. Secondary ditto, c. Antenna, e. 

 Eyes. /. Mastax. h. Gastric gland. J. Stomach, k. Intestine. /. Anus, 

 r. Foot. 



Philodinsea and the Brachionsea, are so well marked and 

 thoroughly natural, that any system of classification would, I 

 think, leave them almost untouched. 



