66 BRITISH FRESHWATER RHIZOPODA. 



p. 116, and op. cit. Ill, an. 10 (1888), p. 91 ; SACCHI in 



Boll. Scient, III, an. 10 (1888), p. 41. 

 Amseba radiosa MAGGI in Rend. R. 1st. Lomb. (2) IX (1876), 



p. 511, and in Boll. Scient, I, an. 2 (1880), p. 35. 

 Astramceba radiosa YEJDOVSKY in Sitz.-ber. K. Bohm. Ges. 



\Viss. 1880 (1881), p. 138, and Thier. Org. Brunn. Prag 



(1882), p. 36, t. i, f. 6. 

 Dactylosphseria radiosum BUTSCHLI in Bronn's Thier-Reiehs, 



I, 1 (1880), t. i, f. 10. 

 Dactylosphasria radiosa LAXESSAN Traite Zool., Prot. (1882), 



p. 47, f . 34 ; BEEGONZINI in Atti Soc. Nat. Modena, 



Memor. (3) II (1883), p. 73. 

 .Dactylo.^Ji&rium radiosum BLOCHMANN Mikr. Thierw. Siiss- 



wass. (1886), p. 11, t, i, f. 10, and ed. 2 (1895), p. 14, t. i, 



f. 6; FRENZEL Mikr. Fauna Argent. I, Prot. 1 (1892), 



p. 32, t, i, f. 5, and 4 (1897), p. 148, in Bibl. Zool. IV; 



DELAGE & HEROUARD Zool. concr. I (1896), p. 99, f. 106; 



FRANC Result. Erfors. Balatons. II, 1 (1897), p. 6; 



LKVANDER in Acta Soc. Fauna Femi. XX (1901), no. 6, p. 5; 



G. S. WEST in Journ. Linn. Soc., Zool. XXVIII (1901), 



p. 310, t. xxviii, ff. 4, 5 ; op. cit. XXIX (1903), pp. 109, 113, 



t. xiii, ff. 1, 2 ; and in Ann. Scott. Nat. Hist. 1905, p. 81. 



Animal small and generally inactive, globular or 

 oval in outline, and exhibiting three or more in some 

 individuals as many as six or eight pseudopodia, 

 which frequently take the form of immobile arm-like 

 projections varying in length and degree of rigidity. 

 They may be short and stumpy, tapering from a broad 

 base, or elongated to several times the diameter of the 

 body, of nearly equal width throughout and blunt at the 

 apex, or long, straight, and tapering acutely. As a 

 rule they radiate from all parts of the body-surface, 

 and remain for long periods without perceptible 

 change. In this condition the animal is quite passive, 

 floating in the waiter or driven about by currents. The 

 body consists of granular protoplasm, and when all 

 the .pseudopodia are withdrawn it may become sub- 

 spherical or bluntly lobed ; or it may assume an active 

 amoeboid phase, when it is hardly, if at all, distinguish- 

 able from the smaller forms of Amoeba proteus. Chloro- 

 phyll ous food is taken during the periods of activity. 



