150 MR. G. H. WAILES ON I'RBSHWATER RHIZOPOCA 



Var. MUSCORUM, Wailes (45). 



E. ciliata pars, Leidy, pi. 36. fig-. 18 (30). 



This variety, recently described, is generally found in moss or dry 

 sphagnum. It may be spined, as shown by Leidy, pi. 36. fig. 18, or may be 

 o-labrous ; the width is greater in proportion to the length .than in the type, 

 and it is more compressed, but the aperture retains its circular shape ; the 

 body-scales are smaller. 



DistTihulion. United States, Panama, Peru, Europe. 



Genus Placocysta, Le'idij. 



Placocysta spinosa {Carter), Leidy. 

 Leidy, pi. 38, figs. 1-16 (30). 



Often numerous in sphagnum from New Jersey. Length 115-163 /i ; 

 breadth 80-120 /x ; aperture 50-80 /x ; spines 20-35 /tt in length, varying 

 from linear to lanceolate in form. 



Var. SETIGERA, var. nov. (PI. 12. fig. 10.) 



Test slightly smaller than the type, but otherwise similar; furnished with 

 numerous long acicular spines scattered near the edges and arising at the 

 imbrications of the scales. Plasma and pseudopodia normal. 



Length 125-135 //- ; breadth 75-85 fx ; aperture 55-65 /u- ; spines 25-15 jj, 

 in length. 



Habitat. Sphagnum. 



The disposition of the spines varies : they may be confined to the borders 

 of the test, or be spread over its surface uutil only the central portions 

 nre glabrous ; none were found having tlie whole of the t^st covered with 

 spines as in P. j«yY(A'sica. Although larger tlum the smallest individuals of 

 P. spinosa, the average size was decidedly less than that of the type. 



Genus Assulina, Elirenberg. 



ASSULINA SEMINULUM, Leidy. 

 Leidy, pi. 37. figs. 18-25 (30). 

 Not plentiful. Length 80-85 /i.- 



A. MUSCORUM, Greeff. 



A. minor, Penard (36). 



A, seminulum pars, Leid}', pi. 37. figs. 15-17, 26 (30). 



Numerous and generally distributed. Length 10-50 //,. 

 Leidy includes this species with the former, but the difference in size is 

 usuallv sufficient to distinguish them. 



