156 BRITISH FRESHWATER RHIZOPODA. 



often pass into them. The examples found were 

 destitute of green colouring matter. 



Genus 30. AMPHIZONELLA Green 2 , 1866. 



Corycia DUJARDIN ? in Ann. Sci. nat., Zool. (3) XVIII 



(1852), p. 241. 

 Amphizonella GREEFF in Arch. mikr. Anat. II (1866), p. 323. 



Envelope membranous, thin and supple near the 

 mouth, presenting a double marginal contour, the 

 inner representing the periphery of the envelope- 

 smooth and well denned; the outer much finer, and 

 serrulate ; the plasma dense and uninuclear ; the 

 pseudopodia blunt, digitate, radiating in a greater or 

 less degree from the inverted mouth. 



1. Amphizonella violacea Greeff. 

 (Plate XXXI, fig. 20.) 



Amphizonella violacea GREEFF in Arch. mikr. Anat. II 

 (1866), p. 323, t. xviii, ff. 12-15; and in Sitzber. Ges. 

 Nat. Marburg, 1888, p. 98; ARCHER in Q. Jrn. Micr. 

 Sci. (n.s.) XVII (1877), p. 464; LEIDY ? Freshw. Rhiz. N. 

 Amer. (1879), p. 291 ; BLOCHMANN Mikr. Thiervv. Siisswass. 

 (1886), p. 11, t. i, f. 12; and ed. 2 (1895), p. 14, t. i, 

 f. 8; MAGGI in Arch. Ital. Biol. X (1888), pp. 185, 189; 

 PENABD in Mem. Soc. Geneve, XXXI (1890), 2, p. 132, 

 t, iii, ff. 9-11 ; Faune Rhiz. Leman (1902), p. 166, ff. 1-4 

 (p. 167) ; and in Eev. Suisse Zool. XIV, 2 (1906), p. 110, 

 t. iv, ff. 1-3 ; PROWAZEK in Arb. zool. Inst. Wien, XII, 3 

 (1900), p. 14. 



Test patelliform, round in lateral view, and sus- 

 ceptible of little change except at the mouth where 

 the membrane is thinnest; violet-tinted ; the fine outer 

 margin delicately serrulate, enveloping the test and 

 about equidistant from it (merging into it only on each 

 side of the mouth) ; the plasma dense, granular, con- 

 taining besides chlorophyllous corpuscles and granular 



