TKINEMA. 39 



GENUS VII. ASSULINA. 



SYN. : Diffliigia, Euglypha, Assulina, Ehr. 



Shell compressed spherical or oval ; neck almost obso- 

 lete, terminating in a transversely elliptical mouth, with 

 nneven or ragged edges, composed of minute, oval or 

 hexagonal plates in alternating rows. Sarcode and pseu- 

 dopods as in EuqlypJia. 



Assulina Seminulum. SYN. : Dijftngia seminulum, Ettgtypka 

 seminulum, Difflugia semen, Ehr. ; Euglypha brunnsa, Leidy ; E. tinc- 

 ta, Archer ; E. seminulum, Leidy. 



Shell nearly as broad as long, compressed, spheroidal 

 or oval ; breadth nearly equal to the length ; thickness 

 half or less than half the breadth ; dome and lateral bor- 

 ders rounded or sub-acute. Mouth transversely oval, 

 and abruptly truncating the pole of the shell, or the latter 

 may be prolonged into a short neck. Shell chocolate 

 brown, sometimes quite light, and in young individuals 

 colorless, usually lighter in color at the mouth ; com- 

 posed of minute, oval or hexagonal plates, arranged in 

 alternating longitudinal or obliquely parallel, spiral rows ; 

 oral plates, lighter in color than the others, end in irregu- 

 lar processes. Sarcode usually occupies but little more 

 than half the capacity of the shell, arranged about the 

 axis. Pseudopods few and extremely delicate. Length, 

 50/j. to 83// ; breadth, 40/z to 71//, and 16^ to 33// thick. 



Hob. Sphagnum, often very abundant. 



GENUS VIII. TKINEMA. 



Shell hyaline, pouch-like, with its long axis inclined or 

 oblique, with the mouth sub-terminal. Dome obtusely 



