242 DESCRIPTION OF [Polygastrica. 



Genus LXXXI. PANTOTRICHUM. The muff Animal- 

 cules. Body turgid, covered with moveable cilii. In 

 P. enchelys stomach-cells are distinctly visible. Ova are not 

 satisfactorily seen, though the green colour of P. volvox, 

 and the yellow- coloured matter of the other species, pro- 

 bably indicate its presence. Ehrenberg says, "the ab- 

 sence of a double opening is not yet proved, nor, on the 

 other hand, is its existence." 



361. PANTOTRICHUM enchelys. The elongated Panto- 

 trichum has a cylindrical oblong body, rounded at both 

 ends. It is of a pale yellow colour, but hyaline at the 

 two extremities, and turbid at the centre. Fig. 212 is 

 a cluster of animalcules ; those to the left, are more 

 highly magnified than the others. In swimming they 

 revolve and glide along in the direction of the longer 

 axis of the body. Found in infusions of raw flesh. Length 

 1-1 150th. 



362. PANTOTRICHUM volvox (Leucophra viridis, M.) 

 The rolling Pantotrichum has an ovate spherical body, of 

 a green colour. Found in brackish water. Size l-860th. 



363. PANTOTRICHUM lagenula. The flask Pantotri- 

 chum has an ovate body, equally rounded at the ends, and 

 having the anterior ciliated portion produced in the form 

 of a neck or beak. Found amongst conferva. Size 

 l-1080th to l-570th. 



Genus LXXXII. CHAETOMONAS. The bristle Monad 

 Animalcules. Characters : oral cilii vibratory ; motion 

 slow, and leaping by means of the bristles on the body ; 

 these are not vibratile. Very little is known of their 

 organization. They are parasites, living on the dead 

 bodies of other Infusoria, and in infusions of flesh or 



