Marvels of Pond-Life. 63 



slipper- shaped, the rounded heel forming his head, then 

 narrowing to a waist, and expanding towards the other 

 end, which projected in a fork. All round him were 

 long cilia, which were conspicuous near the head, and a 

 fine line indicated the passage from his mouth to the 

 stomach, which seemed full of granular matter. Pre- 

 sently he took to crawling, or rather running, over a 

 thread of conferva, and then his back was elegantly 

 arched, and his cilia stood erect like the quills of a 

 porcupine. This was the Chcetonotus larus. 



520 

 Chsetonotus larus (crawling). 



In Pritchard's " Infusoria," the views of those writers 

 are followed who rank this animal amongst the Rotifers, 

 and place it in the family Icthidina. To help out this 

 theory, the cilia upon the ventral surface are imagined 

 to form a <( band-like rotary organ ;" but in truth they 

 bear no resemblance whatever to the so-called wheels of 

 the ordinary Rotifers, nor is there anything like the 

 gizzard which true Rotifers present. Ehrenberg treated 

 it as a Rotifer, and Dujardin placed it among the In- 

 fusoria, in a particular class, comprehending sym- 

 metrical organisms. The 'Microscopic Dictionary ' 

 remarks that its " structure requires further investiga- 



