12 BRITISH FRESHWATER KHIZOPODA. 



have been considered by Dujardin as the type of the 

 species, and that he had already described one of them 

 as E. tuherculata, and also taking into consideration 

 the confusion which has arisen from the indiscriminate 

 use of the name aloeolata and would be perpetuated if 

 it were continued in use, it appears to be better, and 

 not an infringement of the laws of zoological nomen- 

 clature, which allow a name of uncertain application 

 to be discarded, to revert to Ehrenberg's name of 

 acanthophora. With this view Dr. Penard agrees. 



In North America this species attains a length of 

 100 /u; a second circle of spines around the median 

 portion of the test is sometimes present. 



Under the name of E. alveolata, Popoff (1912) 

 describes and illustrates the process of encystment 

 and the liberation of the isogametes, which, as stated 

 on p. 4, conjugate and form small amoeba-like bodies, 

 whose development into the mature animal has not 

 been followed. 



Penard distinguishes two varieties of this species, 

 but intermediate forms exist. 



Var. flexuosa Penard. (PL XXXIII, fig. 4.) 



Euglypha brachiata var. flexuosa 



PENARD Faune Rhiz. Leman (1902), p. 505, ff. 1-5. 



THIEBAUD in Zool. Anzeig. XXIX (1906), p. 796. 

 Euglypha armnta var. flexuosa 



WAILES & PENARD, Proc. R. Irish Acad. XXXI, LXV (1911), p. 38. 



WAILES in Jrn. Linn. Soc., Zool. XXXII (1912), p. 125. 



Test usually more elongated than in the type, but 

 otherwise similar ; the upper portion bearing a variable 

 number of flexuous spines arising at various distances 

 from the apex. Plasma and pseudopodia as in the 

 type. 



Dimensions similar to those of the type. 



ENGLAND. Pilmoor, N. Yorkshire. 



SCOTLAND. Loch Ness, Inverness-shire (Penard). 



IRELAND. Inishbofin, Galway. 



