CARPENTEB OB PHE .\\l\i\- ill i " ftHIZOPODA. J01 



work is produced that might be almost de.M.-rihed as an animated 

 spider's wvk Any small alimentary particles ihat may come into 

 contact with the glntinons 9ur|ace ot the | . \ tained in 



adhesion by it, and speedily pan. 



on in tiieii* substance. Tliis movement tajies place, in two principal 

 direi-iions ; from the body towards , . mitics of the p>eiido- 



podia, and from tliese extremities back to the bodv again, in the 

 r branches a donhle current may be seen, two streams passing al 

 the same time in opposite directions; hnt in the liner filaments 1 he 

 cuiTent is single, and a granule may be seen to move in one pf 1hem 

 to its very extremity, and theu to return, perhaps i.. .,d carrv- 



ing back with it a granule that was seen advancing in the opp< 

 extremity. Even in the broader processes, granules are sometimes 

 observed to come to a stand, to oscillate for a time, and then to take 

 a retrograde course, as if they had been entangled in the opposing 

 current, — just as is often to be seen in Chant. AVhcn a grannie 

 arrives at a point where a filament bifurcates, it is often arrested for 

 a time until drawn into one or the other current ; and when carried 

 across one of the bridge-like connections into a different band, it not 

 unfrequently meets a current proceeding in the opposite direction, 

 and is thus carried back to the body without having proceeded very- 

 far from it. The pseudopodian network along which this " cyclosis" 

 takes place is continually undergoing changes in its own arrange- 

 ment; new filaments being put forth in different directions, sometimes 

 from its margin, sometimes from the midst of its ramifications, whilst 

 others are retracted. Not unfrequently it happens, that to a spot where 

 two or more filaments have met, there is an Influx of the protoplasmic 

 substance, which causes it to accumulate there as a sort of secondary 

 centre, from which a new radiation of filamentous processes takes place. 

 Now, the entire absence of differentiation in the protoplasmic 

 substance, the freedom of the mutual inosculation of its pseudopodian 

 extensions, and the active cyclosis incessantly going on between tliese 

 and the body, are three mutually related conditions, which not only 

 serve to characterize the group of ainmals that exhibits them, but, as 

 we shall presently see, to differentiate that group from others. There 

 is, moreover, a negative character of much importance, which is 

 naturally associated with the absence of differentiation, — namely, tho 

 deficiency of the "nucleus" and "contractile vesicle" that occur both 

 in Actinophrys and in Amoeba. So far as is yet known, there is a 

 perfect agreement as to all these characters between the Foramin ij "era 

 and the Gromida; and I regard Licbcr'ku.linia as standing in the same 

 relation to the chitine-covered Groiuia or to the calcareous-shelled 

 Foramidifera, that Actinophrys does 10 the chitine-covered Fuglypha 

 or to the siHeeous-shelledPo/^y^/;?^. The entire group thus consti- 

 tuted may (as it appears to me) be appropriately termed Bhizopoda 

 Eeticularia; the ordinal designation being meaut to express that 

 reticulose arrangement of the pseudopodian extensions which i 

 distinguishing cha ra cte i ■'■ 



