RECENT MEMOIRS ON FRESHWATER RHIZOPODA. 349 



be truly an independent form, he pro tern, relegated to the 

 Monera. I may, perhaps, be forgiven for the guess, but the 

 figures of this Sarcodine remind one not a little of a portion 

 of the mass of a Gromia become isolated and detached by 

 some readily conceivable force, having wandered too far from 

 the headquarters. If the author's suggestion be borne out, 

 it would very likely form a parallel for the naked Lieher- 

 kuhnia (Clap, et Lachm.), as compared with the Monatha- 

 lamia Monostomata. It would be very desirable that 

 Lieberkiihnia could be rediscovered and subjected to a fresh 

 research. Claparede's and Lachmann's supposition, that 

 Bailey's Pamphagus could be one and the same thing is, I 

 feel satisfied, quite out of the question ; that form is a wholly 

 different thing. 



Plakopus ruber, E. Schulze^ (fig. 23), 



is the name given by the author to a curious Sarcodine, ren- 

 dered unique, as it is, by the remarkable form of the pseudo- 

 podia. It is a naked acyttarian Amoeban rhizopod, with 

 pseudopodia, not in the form of lobes, or simple or branching, 

 finger-like or filamentary prolongations, but taking the form 

 of thin, membrane-like lamellce, these not spreading, like 

 ordinary pseudopodia, upon the substratum (as, for instance, 

 on the glass slide), but projected free in the water, and 

 uniting here and there where they touch, they form around 

 the body-mass a number of irregularly rounded, cup-like, 

 hollow spaces, widening upwards. The distinction into a 

 hyaline, equally refractive ectosarc, whence are formed the 

 pseudopodia and an inner body-mass, with its varied con- 

 stituents, though without any sharp line of demarcation, can 

 be readily made out. The most striking element in the 

 interior are the scarlet, brick-red, or sometimes brownish-red, 

 or it may be greenish, particles of varying size. These 

 colours may be found gradually merging one into the other, 

 some intensely green, others pale brownish-green, then 

 reddish-brown, and finally a clear red. (I venture to think 

 it might be as well denied that these coloured granules 

 belonged to the form under consideration, as the green 

 granules of Cochliopodium and others.) 



A single or several nuclei are present, in the ordinary 

 state not easily noticeable, but under reagents readily be- 

 coming evident. A comparatively large nucleolus is sur- 

 rounded by a broad, clear, rounded border, its outer limits 

 only seldom sharply marked. 



^ Ed. Schulze, loc. cit., p. 348, t. xix, figs. 9 — 16. 



