124 BiUTISH FBKSHWATEB EHIZOPODA. 



Sphagnum gathered by Mr. W. Evans in the summer 

 of 1906, abundant. 



This pretty species was taken at first for a diminutive 

 form of N. coUaris Leidy, or one of its allies, but its 

 occurrence in Sphagnum from the localities mentioned 

 was so frequent, and the characters of the individuals 

 were so constant, that careful study led us to the con- 

 clusion that it could not be referred to any previously- 

 described species. The test is remarkably transparent. 

 A form closely resembling it, but rather longer in pro- 

 portion, occurred at Dunham in the previous year. It 

 may not improbably have been the same, the difference 

 being due to environment, but without more examples 

 for comparison (only one or two were found in Cheshire) 

 it is impossible to say definitely. 



18. Nebela caudata Leidy. 



(Fig. 98.) 



Nebela caudata LEIDY in Proc. Acad. Philad. 1876, p. 58, 

 andFreshw. Rhiz. N. Amer. (1879), p. 160, t. xxvi, ff. 

 21-24; HITCHCOCK Synops. Freshw. Rhiz. (1881), p. 23; 

 EYFEKTH Naturgesch. mikr. Siisswass. ed. 3 (1900), p. 

 265; PENARD Faune Rhiz. Leman (1902), p. 574, f. 5 (p. 

 572) ; ? in Pr. R, Soc. Edinb. XXV, 8 (1905), p. 594; 

 and in Jrn. R. Micr. Soc. 1907, p. 278; AVERINTZEV in 

 Trudui S.-Peterb. Obshch. XXXVI (1906), 2, p. 235; 

 MURRAY in Pr. R. Soc. Edinb. XXV, 8 (1905), p. 609; 

 CUSHMAN in Amer. Natur. XL (1906), p. 273; SCHOUTEDEN 

 in Ann. Biol. Lacustre, I, 3 (1906), pp. 353, 354. 



This apparently scarce rhizopod is described by 

 Leidy as possessing an ovoid compressed test, " with 

 from four to five naked, blunt, conical or clavate pro- 

 cesses projecting from the lateral borders and summit 

 of the fundus " ; the mouth transversely oval. The 

 structure resembles that of N. collaris, being trans- 

 parent and colourless, but the surface-markings are 

 usually less distinct. The plasma is likewise colourless. 



Dimensions : Length about 90 /x, ; breadth 70 JJL. 



