HELEOPERA LATA. 143 



pseudopodia not observed, but probably not differing 

 from those of the preceding species. 



Dimensions: Length 115 p ; breadth 100 p ; width of 

 mouth 55 fi. 



In Sphagnum, Knutsford, Cheshire ; Criccieth, Car- 

 narvonshire, and near Dolgoch Waterfall, Merioneth- 

 shire. Killough, Co. Wicklow, Ireland (J. Hopldnsoii). 



H. lata is a large and handsome species, and may 

 readily be distinguished from its congeners by the 

 broadly-arched crown and straight lateral margins. 

 We have examined a good many tests and find these 

 characters to be constant. In colour it closely re- 

 sembles the preceding species, of which at first we 

 took it to be a well-marked variety. Its frequent 

 recurrence, however, in different localities, and slight 

 tendency to vary, in any respect, justifies its receiving 

 specific rank, though no living example has been met 

 with. 



5. Heleopera sphagni (Leidy).* 

 (Plate XXX, figs. 4-9.) 



Difflttgia (Nebela} sphagni LEIDY in Pr. Acad. Philad. 1874, 



p. 157. 

 Nebela sphagni LEIDY in Pr. Acad. Philad. 1876, p. 119, ff. 



16, 17. 

 Heleopera picta LEIDY Freshw. Rhiz. N. Amer. (1879), 



p. 162, t, xxvi, f. 1-11 ; and in Pr. Acad. Philad. 1879, 



p. 163; HITCHCOCK Synops. Freshw. Rhiz. (1881), p. 24; 



ENTZ in Biol. Centralbl. II (1882), p. 451 (as pieta) DE 



TARE in Rep. N. York State Mus. XXXV (1884), p. 167 ; 



GREEI-F? in Sitzber. Ges. Nat. Marburg, 1888, p. 112; 



HARVEY in Amer. Natur. XXII (1888), p. 73 (as pieta) ; 



CERTES Prot. in Mission scient. Cap. Horn, VI, 3 (1889), 



p. 20; CASH in Tr. Manch. Micr. Soc. 1891 (1892), p. 



51, f. 13 ; SCHEWIAKOFF in Mem. Acad. Sci. St. Petersb. 



(7) XLI (1893), p. 98 ; FRENZEL in Bibl. Zool. IV, 12 



(1897), p. 148 ; AVERINTZEV in Trudui S.-Peterb. Obshch. 



XXK, 1 (1900), p. 240; op. cit. XXXVI (1906), 2, p. 254; 



in Ber. Siisswass. nat. Ges. St. Petersb. I (1901), p. 215; 



* [Heleopera picta Leidy : CASH, MS. The remarks on p. 112 on change 

 of specific name apply equally to this species.] 



