564 DESCRIPTION OF {^Polygastrica. 



membranous anteriorly, and terminated by an oblique margin ; along 

 which some small black nodules may be seen. In pond-water, near 

 Paris. The Enchelys Spathuh, of Miiller, would seem to be the 

 same species ; but the Leucophnjs Spathula, of Ehrenberg, differs 

 from it in having a row of cilia on the anterior margin, with striae on 

 each side ; as also in receiving indigo in its stomach-sacs. 

 (P. 21, f. 27.) 



Genus Holopheta. — TJie ivooly Animalcules comprehend Enchelia 

 covered with vibratile cilia ; body ovoid, oblong, or even cylindrical ; 

 mouth anterior, directly truncated or terminal, and without Hp or 

 teeth. Digestive cells have been seen in all the species ; and in two, 

 the mouth and discharging orifice. The cilia are disposed in longi- 

 tudinal rows. In H. ovum green granules and a posterior contractile 

 bladder are observable ; self- division appears to be transverse in 

 H. discolor. 



H. ovum {Leucophra hursata, M.y — Body ovate, somewhat cylin- 

 drical, exti'emities sub-trancate (fig. 281) ; ova gi-een. Poimd 

 amongst Lemna and Conferva. Size 1-5 70th to 1-2 10th. 



H. discolor {Trichoda horrida, M.) — Body white, ovate, conical, 

 subacute at the posterior extremity ; cilia long and scattered. Found 

 amongst Conferva. Size l-240th. 



H. coleps {Leucoplira glohuUfera, M.) — Body oblong, cylindrical ; 

 roiuided at both exti-emities. It is of a white hue. Size 1 -430th 

 to l-280th. 



Jlolophnja, and the follo-\\dng genus Prorodon, are included in 

 Dujardin'sfamily, Paramcciens.'' One new species is described, viz. : — 



H. hrunnea. — Body brown, changing from a cylinder to a globular 

 form, when filled with food ; and also then altering in colour. 



Genus Pkokodon. Toothed cylinder Animalcules. — This remarkable 

 genus is distinguished by its directly truncated mouth, furnished with 

 a circlet of internal teeth. The body is covered with vibratile cilia. 

 A polygastric system of nutrition (with anterior and posterior orifices 

 of the alimentary canal) has been obsei-aed, by feeding with^colouiing 

 matter. A long band-like gland and contractile bladder, with a 

 granulated mass, are seen in P. niveus. 



P. niveus. — Body large, elliptical, and compressed ; colour 

 white ; ciixlct of teeth comprct>scd, as shewn separate at fig. 283. 



