18 HYALOSPHENIA. 



papilio. SYN. : Difflugia (catharia) papilio, 

 Leidy ; //. papilio, Leidy. 



Shell compressed oblong, ovoid, or compressed pyri- 

 f orm ; in the broader view the f undus transversely con- 

 vex, and sides gradually tapering to the slightly convex 

 oral end, or with a pyriform outline ; in the narrower 

 view the fundus angularly rounded and the oral end 

 notched. Mouth transversely oval, with rounded com- 

 missures. Shell yellowish, transparent ; endosarc bright 

 green from chlorophyll ; pseudopods colorless, digitate, 

 up to six in number. Size : length, 108// to 140/>; 

 breadth, 68// to 84// ; thickness, 32^ to 40^ by 8//. 



Hob. In moist sphagnum ; not found in ponds. 



Hyalosphenia tincta. 



Shell compressed pyriform, relation of length to 

 breadth variable, in transverse section compressed oval, 

 of pale yellow, transparent, chitinoid membrane ; mouth 

 transversely oval. Sarcode colorless ; pseudopods digi- 

 tate, two, three or more. Like II. cuneata but more 

 pyriform, shell colored, and lives in sphagnum instead of 

 in ponds. Neck very short. Shell is thicker and less 

 flexible than that of //. cuneata, and a pair of pores is to 

 be seen on the lateral borders, usually below the middle, 

 sometimes . another pair above. It is probable that H. 

 tincta merges into H, cuneata, and likewise into H. ele- 

 gans and H. papilio. Size : length, 76// to 92/i ; breadth, 

 56// to 64// ; mouth, 20 /j. by 8p. 



Hob. Sphagnous swamps and moist sphagnum. 



