80 Marvels of Pond-Life. 



exposes a row of cilia. After this two distinct wheels 

 are everted, and as their cilia whirl and spin, the animal 

 is swiftly rowed along, until it thinks proper to moor 

 itself fast by the tail-foot, and employ all its ciliary 

 power in causing currents to converge towards its 

 throat. When it pleases it can elongate the body, till 

 it becomes vermiform, and it walks like the common 

 rotifer, by curving its back, and bringing its nose and 

 its tail in contact with the ground. 



Philodina (crawling). 



The gizzard of this family (Philodincea) presents a 

 considerable deviation from the perfect form exhibited 

 by the Brachions. According to Mr. Gosse, "The 

 mallei and the incus (terms already explained) are 

 soldered together into two subquadrantic-globular 

 masses, which appear to be muscular, but invested with 

 a solid integument. The manubria (handles) may still 

 be recognised in a vertical aspect as three loops, of 

 which the central one is chiefly developed, and in a 

 vertical aspect as a translucent reniform (kidney-shaped) 

 globe." These descriptions are not easy to understand, 



