Megalotrochaea.} THE INFUSORIA. 339 



is visible ; vessels and tremulous gills unknown ; a nervous 

 system is indicated by a round glandular knot at the 

 oesophagus. 



571. CYPHONAUTES compressus. The three-lobed 

 Cyphonautes is white, the body compressed, obtusely 

 triangular, truncated anteriorly, and sub-acutely gibbous 

 upon the back ; near the cesophagal head is a spherical 

 gland, probably a brain ; no eye with coloured pigment is 

 present ; on each side a band-like muscle proceeds to the 

 end of the back, which terminates in a changeable wart 

 (perhaps suction disc). It swims with a vacillating motion. 

 Fig. 373, plate viii., represents a full-grown animalcule. 

 Found in sea water. Size 1- 100th. 



Genus CXLI. MICROCODON. The bell little Jish Ani- 

 malcules possess a single eye, the simple wreath of cilii 

 bent in the middle resembles the figure 8 lying transversely; 

 the alimentary canal is thick and straight, without a 

 stomach ; it has no oesophagus tube, but has a sort of 

 ossophagal bulb and a couple of single-toothed jaws ; also 

 a turbid ovarium. Immediately behind the rotatory appa- 

 ratus is a small red visual organ, and at the frontal region 

 beside it is a reddish knot, whose function is unknown. 



.572. MICROCODON clavus. The bell Microcodon. Body 

 campanulate, pedicled, the styliform foot-like tail as long 

 as the body ; in the middle of the brow are two bundles of 

 stiff bristles, and two pincer-like points, evidently teeth, 

 project out of the middle of the rotatory organ, and are in 

 connexion with the reddish jaws. Fig. 371 is a back, and 

 372 a left side view. Size l-280th. 



Genus CXLII. MEGALOTROCHA. The parasol or great 

 wheeled Animalcules possess two eyes, which sometimes 



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