154 BRITISH FRESHWATEE RHIZOPODA. 



anterior region ; short and conical or elongated, taper- 

 ing, and bluntly pointed. The thin investing mem- 

 brane covered superficially with fine hair-like processes 

 which give the organism a finely hirsute appearance. 



Dimensions : Average 35 /a (Penard). Diameter 

 without spines 24-25 /a; length of spines 3'7-5 ju, 

 (West). 



In ponds and ditches, chiefly amongst floating algae, 

 rare. Esher West End Common, Surrey, and near 

 Cambridge (G. 8. West). Ponds at Northern Btchells, 

 Cheshire. Co. Westmeath, Ireland {W. Archer). 



Archer was of opinion that this was identical with 

 G. hiUmbosum. Leidy, however, whilst admitting that 

 there might be good ground for the supposition, kept 

 the two forms distinct. The Cheshire examples were 

 sufficiently characteristic, and could not possibly be 

 confounded with G. hilimhosum from the same neigh- 

 bourhood. The colovir of the test Archer found varied 

 from a pale yellowish brown in some examples to a 

 pale bluish tint in others, the deeper colour being 

 always at the circumference of the body. The move- 

 ments of the animal are extremely slow. 



The organism which we have figured (PI. XXXII, 

 figs. 17 and 18), obtained from Sphagnum gathered near 

 Towyn, Merionethshire, might almost be considered a 

 new species. It was smaller and much more delicate 

 than typical G. vestitum, whilst agreeing with this 

 species in having an almost invisible array of fine hair- 

 like processes covering the surface. Seen in lateral 

 view the form of the test was bell-shaped, with a 

 perceptible expansion at the mouth. There was a 

 further peculiarity in the character of the ectoplasm. 

 Instead of the straight pointed pseudopodia so charac- 

 teristically grouped in G. vestitum, these organs were 

 represented by a broad expansion of colourless ecto- 

 plasm, very finely serrated on the outer margin, but 

 without lobes or prolongations of any kind. The body 

 of the organism was well filled with minute chloro- 



