580 DESCRIPTION OF IPoli/gnstrica. 



rior oblique fold, and are able to contract themselves into a ball. 

 They differ from Uoloplirya by their lateral mouth. They live either 

 in ft'esh, smooth water, or in sea water among plants. 



Panopiteys Chrysalis. — Body ovoid, oblong, depressed, mouth ac- 

 companied by an enlargement, and placed near the front extremity. 

 Length l-145th. Found in sea water (f. 33, pi. xxi). 



P. rubra (?) — Figure reniform, covered with fine cilia, and pro- 

 vided with a lateral mouth near the front extremity. Length 

 l-370th to l-325th. In sea water. Only provisionally named. 



'P.farcta. — Body ovoid, oblong, filled with particles swallowed, 

 giving it a green, a reddish-yellow, or various mingled colours; 

 mouth lateral, placed between the centre and the anterior third of 

 the body. Length 1 -145th to 1-11 5th. In marsh water among 

 plants. I think it is the animalcule described under three names by 

 Ehrenberg, viz., Bursaria vernalis, JB. leiicas, and B.Jlava; and pro- 

 bably the Leucophra virescens of Miiller. 



Genus Acineria. — Body oblong, depressed, or lanceolate, with a 

 row of cilia extending forwards on one side, which is curved like a 

 sabre. Distingiushed fr-om Trachelius by the disposition of the row 

 of cilia and the curvature forwards. Like Trachelius, they seem 

 destitute of a mouth, and in this respect they especially differ from 

 Peleciia. 



A. inciirvata. — Body contractile, oblong, compressed, almost lamel- 

 lar, round, or obtuse behind ; contracted and cui'ved in front ; a row 

 of cilia runs along the convex edge, and there are five or six granular 

 stripes, and one or more variable vaculae. Length 1- 590th (f. 21 a.b. 

 pi. xxi). In the Mediterranean. It appeared to be without a ren- 

 ticulated and contractile integument. 



A. acuta. — Body diaphanous with granules dispersed in its interior, 

 oblong, compressed ; pointed at its two ends, or lanceolate with one 

 side more convex in front and fringed with a cilia. Length l-580th. 

 In pond water. 



Genus Pelecida. (Duj.) — Body flexible contractile, oblong, com- 

 pressed, rounded behind, curved in the form of an axe in front, 

 ciliated throughout, and furnished with a mouth cither visible or 

 demonstrable from the various objects met with in the interior of the 

 animal. 



