22 A. EicnHORNii, Ehrenberg, Bericht. Preus. Ak. Wiss., ]8-t0, 



198 ; Leidy, R Rhiz. N. Amer., p. 259, pi. xli. A very 

 common species, abundant in the Waterloo Swamp and 

 many other places. 



Clathrulixa, Cienkowski. 



23 C. ELEGANS, Cienk., Archiv. fiir Mik. Anat., in., 1867, 310, 



Taf. XVIII.; Leidy, F. Rhiz., N. Amer., 273, pi. xliv. This 

 species is very common on Nitella and other tine-leaved 

 plants. I have found it in plenty in nearly all the places 

 I have visited in search of aquatic life. Australian speci- 

 mens appear to be more luxuriant in their growth than 

 European or American examples, the branched or compound 

 state being the most prevalent, whilst the solitary form is rare. 



Order m. FOEAMINIFERA. 

 BiOMYXA, Leidy. 



24 B. VAGANS, Leidy, F. Rhiz. N. Amer., 281, pis. xlvii., xlviii., 



tigs. 5-12, and in Proc. Ac. Nat. Sc, Phil. 1^75, 124. A 

 few months ago this species was fairly abundant in my 

 aquarium. I saw altogether about 20 specimens, many of 

 which I examined with great attention. When tirst placed 

 on a glass slip it often assumes a spherical shape, and 

 remains motionless for some time. Then all at once it 

 begins to send out pseudopodia from all sides, but ultimately 

 they appear chiefly at the ends of the main body of proto- 

 plasm. The ramitications, extreme tenuity, and rapid 

 movement of the pseudopodal processes are really marvell- 

 ous. It is a diflScult matter to trace out the actual termin- 

 ation of the branches, on account of their tenuity and ever 

 changing movements. The whole organism looks like an 

 animated spider's web. I have often noticed rounded 

 masses at some distance from, but connected with, the 

 main body by very slender threads. In these masses there 

 was a continued rotation of the granular protoplasm around 

 a large non-contractile vacuole. The time during which 

 this semi-isolation continued, varied considerably, but in 

 one instance it lasted for over an hour. When the return 

 movement commenced tlie granular matter was conveyed 

 away tirst, and afterwards the large vacuole broke up into 

 a number of smaller > 



.,„^J 



