Cryptomonadina.'] iNFrsoRiAt ANTMAirrLKS. 149 



cases, quite transparent. The motor filament, however, disappears 

 with the livdng contents ; but globules of the latter, indeed, remain 

 after death. 



The optical character of tlie red speck in the individuals of this 

 genus is denied by Dujardin, as also the existence of a mouth, 

 stomach sacs, and sexual glands, supposed by Ehrenberg, who has 

 described three out of the foiu- species of Phacus, adduced by the 

 French naturalist, as specimens of Eucjhna. 



Thus, 1. Pliacus pleuronectes = E.phuronectes. 2. P. longicauda = JE. 

 hngicauda. and 3. P. triquetra = E. triquetra. (See Euglena.) 

 The new species of which the characters are given is : — 

 Phacus tripteris. Body oblong with three longitudiaal plaits meet- 

 ing along the axis, rather twisted on the mid rib, with a red speck in 

 front and a diaphanous caudiform prolongation behind. Length 

 1 -420th, 1-3 12th. 



Genus Ceumentjla. (D.) Body oval, compressed, clothed with a 

 resistant integument (testa) obliquely situated, and, as it would seem, 

 reticulated, sending out obliquely from a notch in the anterior 

 border, a long flagelliform filament. Motion slow. There is no tail 

 like prolongation as in Pliams. 



C. texta. Envelope resistant, reticular, filled with a green matter, 

 together with vacuolee or hyaline globules, and having a large 

 anterior red globule. Length l-520th. Testa persistent after death. 

 (P. 21.f. 6.) 



The anterior notch is produced by a sort of overhanging lip. The 

 filament is three times longer than the body. 



Genus Diselmis. (D.) Body ovoid or globular, covered by an 

 integument, of almost a gelatinous consistence, but not conti'actile, 

 and provided with two equal locomotive filaments. 



This genus nearly corresponds to the Chlamidomonas of Ehrenberg, 

 placed by him in the family Vohocina, by reason of its apparent self 

 division, into two or foiir segments within the testa. Dujardin, on 

 the other hand, admits none as Fblvocma which do not exhibit an 

 aggregation of perfect individuals within a common envelope. 



The integument of Diselmis is non-resistant, diaphanous, breaking 

 up after death, it is sometimes filled with a green substance, ac- 

 cording to Ehrenberg, coloured ova, an improbable supposition in 



