Trachelina.] THE INFUSORIA. 301 



Figures 300,301, and 302, represent different views of this 

 creature ; the latter shows it while undergoing transverse 

 self-division. Found with Monads. Size 1 -280th. 



Genus CXVI. CHILODON. The lateral beaked Animal- 

 cules. Body ciliated, frontal region produced in the form 

 of a broad membranaceous lip, expanded on one side, 

 resembling a beak ; the mouth, situated at its base, is fur- 

 nished with a tabular fascicle of teeth. In one species a 

 straight alimentary canal, with digestive cells attached to 

 it, is seen ; ova granules, and a contractile vesicle, are 

 visible in three species, an oval gland in all; in one 

 only has transverse and longitudinal self- division been 

 observed, and in this the parts separated are so small that 

 they may be considered as gemma or buds. 



495. CHILODON cucullus (Kolpoda cucullus, M.) The 

 helmet-like Chilodon. This creature, represented in Jigs. 

 303 to 307, has a depressed oblong body, rounded at the 

 ends, the frontal region advancing on the right side, 

 Ehrenberg states he has often seen the straight alimentary 

 canal, with its grape-like cells, filled with large Naviculae. 

 Three contractile vesicles and a large oval gland near the 

 middle have been observed. The circlet of teeth (figures 

 308 and 309) consists of little hard wand-like bodies ; these 

 the creature can separate so as to admit into its mouth 

 large living bodies, after which it contracts or closes them. 

 (See the engravings.} In swimming, or creeping upon the 

 surface of conferva, the mouth is turned under or below. 

 Its motion is gliding, and it does not revolve in swimming. 

 When the water is coloured, the cilii may be easily per- 

 ceived, and their disposition when it is dried. Figs. 305 and 

 306 exhibit it while undergoing longitudinal, and 307 trans- 



