584 DESCRIPTION OF [Polt/gostrica. 



Diijardin, speaking of this genus in Ehreuberg's system, says, 

 " among his Koljjodce which should possess a short tongue, and be 

 ciliated only on the ventral surface, this author includes but one 

 species with certainty, the K. ren. and K. cucullio having formerly 

 been referred by him to the genus Loxodes, in which, indeed, we 

 still leave them. But he places among the Paramecia, under the 

 appellation of P. kolpoda, some larger animalcules, ciliated through- 

 out, which we regard but as more developed forms of Kolpoda 

 cucullus." 



Kolpoda cucullus (M.) — Body turgid, slightly compressed ; kid- 

 ney-shaped, reniform, often attenuated anteriorly. Ehrenberg states 

 the mouth is closed by a little fleshy tongue ; this is most dis- 

 tinctly seen in Paramecium aurelia. When the ova are deposited, 

 a collapse of the body ensues, and hence a change of form. When 

 very young they are difficult to distinguish from Monads. P. 7> 

 fig. 324, represents the normal form of this species. Fig. 325 repre- 

 sents the animalcule depositing its ova in a net-like mass, and 

 figs. 326, 327, and 328, are three young animalcules, which re- 

 semble Trichoda pyriformis. Common in vegetable infusions. 

 Size l-1800th to l-280th. 



K. (?) 7'en. — Body ovato-cylindrical, kidney-shaped, and rounded 

 at the ends. Found in river water. Size 1 -288th. 



K. (?) cucullio {M.y — Body compressed, plane, elliptical, slightly 

 sinuated anteriorly. Ehrenberg remarks neither cilia nor tongue- 

 like member was observable by him : hence its generic situation is 

 uncertain. Size 1 -900th. 



Genus Paramecium. The oblong Animalcides. — Body oblong, 

 compressed, ciliated on all sides ; mouth lateral, with a (wart-like) 

 tongue-like process ; no visual point. The cilia are disposed in 

 longitudinal series, those near the mouth are sometimes longer than 

 the others, and are alone subservient to locomotion, except in two 

 doubtful species. In P. chrijsalis the long oral cilia are remark- 

 able. The digestive cells are numerous, amounting to more than a 

 hundred ; they are arranged in a berry-like manner along the curved 

 alimentary canal : in five species they have been demonstrated by 

 artificial means, in a sixth by its usual green food. The ova in two 

 species are seen as a granular mass. In all, except one species, male 



