ATTEMPT TO RE-OLASSIFY THE ROTTFERS. 



343 



strikingly, in the shape of the trochal disc, in the disposition of 

 the vibratile cilia, in the position of the mouth, and in the form 

 of the jaws; and it is difficult to understand how Ehrenberg 

 could have persuaded himself to place them together. 



Again, Lacinularia, Megalotrocha, and Conochilus 

 all find themselves in different families ; though the two former 

 are so alike as to be at times mistaken for each other, and the 

 latter (though its parts are arranged in an unusual manner) is 

 certainly more nearly akin to them than to any other genera. 

 Conochilus is indeed a tough morsel for a classifier. In all 



Fig. 11. 



Fig. 11. — h. Secondary ciliary wreath, j. Stomach. 



n. Contractile vesicle, p. Ovum. r. Foot. 

 Fig. 12. — a. Principal ciliary wreath, c. Antenna. 



k. Intestine. /. Anus, 



Eye. 



other Melicertans the row of smaller cilia encloses the row 

 of larger ones and also the mouth — the antennae being outside 



