40 SPHENODERIA. 



rounded ; mouth inverted, circular, minutely beaded at 

 the border. Structure of the shell in the smallest forms 

 apparently homogeneous, but in the larger ones composed 

 of circular plates arranged in alternating series, and often 

 appearing with a beaded margin. Sarcode and pseudo- 

 pods as in Euglypha. When moving, the body is in- 

 clined, mouth downward, fundus directed upward and 

 backward. 



enchellS. SYN. : Trineme, Trinema, Duj. ; Diflngia 

 enchelis, Arcella hyalina, constricta, A. Nidus pendulus, A. disphara, 

 caudicicola, enchelys, megastoma, rosirata, reticulata, seriata, pyrum ; 

 Homceochlamys constricta, etc., Sticholepus caudicicola, etc., Heterocosmia 

 Pyrum, Ehr. ; Trinema acinus, Duj. ; T. enchelis, Leidy. 



The only species. One of the commonest shell-bear- 

 ing rhizopods. Length, 16// to 100/^; breadth, 10// to 

 60 ; mouth, 5// to 24/*. 



Hob. Ooze of pools and in moist places. 



GENUS IX. SPHENODERIA. 



Shell globular or oval, sometimes slightly compressed, 

 hyaline, membranous, with a short, broad neck, and a 

 wide, elliptical, subterminal, or oblique (?) mouth ; body 

 with circular, oval or hexagonal plates or cancelli, ar- 

 ranged in alternating series. Sarcode and pseudopods as 

 in Euglypha. 



Sphenoderia lenta. SYN. : S. lenta, Schlum., Ehr. ; Euglypha 

 globosa, Carter, H. and L., Schulze, Leidy; Assulina lenta, Ehr. 



Shell delicate, membranous, colorless, transparent, 

 globular, oval or oblong ; sometimes slightly compressed, 



