Trackdinn.] infusorial animalcules. oil 



nearer the centre than the anterior ruarghi. Length 1 -860th to 

 l-520th. Found in a rain water-butt. 



Genus Chilodon. 7'he lateral-heaked Animalcules. — Eody irrcgu- 

 lai'ly oval, flattened, regularly ciliated ; frontal region produced in 

 the form of a broad membranous lip, expanded on one side, resem- 

 bling a beak ; the mouth, situated at its base, is furnished mth 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 

 obsei-ved, and in this the parts separated are so small that they 

 may be considered as gemmae or buds. 



C. cucuUus {Kolpoda cucullus, M.) — Figs. 303 to 307. Eody de- 

 pressed, oblong, rounded at the ends; 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 Navi- 

 cula3. Three contractile vesicles and a large oval gland near the 

 middle have been observed. The circlet of teeth (figs. 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. (Sec the engravings.) In swim- 

 ming, 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 cilia may be easilj' 

 perceived, and their disposition when it is dried up. Figs. 305 and 

 306 exhibit it while undergoing longitudinal, and 307 transverse, 

 self-division. Found both in fresh and saltwater. Size l-1150th 

 to 1 -140th. 



C. uncinatus. — Body depressed, oblong, rounded at the ends. The 

 right side of the anterior part is produced, so as to appear like a 

 hook or beak. Found in vegetable infusions. Size 1 -430th. 



C. aureus. — Body ovate, conical, turgid, of a golden yeUow colour, 

 dilated and obtusely rostrated anteriorly, attenuated posteriorly. 

 Size 1-1 40th. 



C. ornatus. — Body ovate sub-cylindrical, of a golden yellow 

 colour, equally rounded at both ends, slightly beaked; it has a 

 bright violet spot. Size 1-1 80th. 



