64 BRITISH FRESHWATER RHIZOPODA. 



containing several small nucleoles, placed posteriorly ; 

 pseudopodia few in number, digitate, simple. 



Length 60-70 /x ; breadth 45-55 /x ; aperture 20- 

 25 //,; nucleus about 15 /A in diameter. 



Habitat. Sphagnum. 



ENGLAND. N.Yorkshire; Bedfordshire; Shropshire; 

 Buckinghamshire ; Isle of Wight ; Somersetshire ; 

 Cornwall. 



WALES. N. Wales. 



SCOTLAND. Outer Hebrides. 



IRELAND. Mayo and the islands off Clew Bay ; 

 Inishbofin, Gal way. 



The only other species of Heleopera resembling this 

 is H. sphagni var. laevis Wailes (' Journ. Linn. Soc.,' 

 Zool., vol. xxxii (1912), p. 14-3), which however 

 usually exceeds it in size, has a smoother fundus, and 

 is of a characteristic yellow colour ; the test also has a 

 peculiar reticulated structure (v. Leidy, 1879, PL xxvi). 



H. 'sordid/I is also peculiar among the species of the 

 genus in having vegetable debris attached to the 

 fundus ; this is easily confirmed by immersing the test 

 in a chlor-zinc-iodine solution which stains vegetable 

 tissue a dark red ; also when the tests are mounted in 

 Canada balsam the vegetable particles usually appear 

 black. 



It is a widely distributed species and occurs on the 

 Continent of Europe, in North and South America, 

 Australasia, and the Seychelles. , 



Genus 27 a. AVERINTZIA* Schouteden, 1906. 



Heleoporo. (pars) PENARD Faune Rhiz. Leman (1902), 



pp. 390-393. 

 Awerinzewia SCHOUTEDEN in Ann. Biol. lacustre, I, 1 (1906), 



p. 357. 



* This alteration in spelling from the German form of Awerinzewia seems 

 to be the nearest approximation to the transliteration into English, with 

 generic form of termination, of the Russian characters in the name of the 

 distinguished biologist in whose honour this genus was founded, and is in 

 accordance with Latin orthography, which the German form is not. 



