8FHENODEEIA. 41 



with a short, broad, compressed neck, widening toward 

 the narrow, elliptical mouth, which is oblique or subter- 

 minal (?). Border of mouth thin, delicate, entire. Bod y 

 of shell composed of circular or oval plates, overlapping 

 at their contiguous borders and arranged in alternating 

 series, apparently not extending to the neck. Sarcode as 

 in Euglypha and Trinema. Sphenoderia is closely re- 

 lated to Trinema; and a variety with a denticulated 

 mouth is nearly related to Assulina seminulum. Glo- 

 bose forms : length, 32^ to 56// ; breadth, 28// to 52// or 

 to 56fji in diameter ; oval forms : from 28^ to 56^ long, 

 and 20// to 44// broad. 



Hob. Common in moist sphagnum and in bogs. 



Sphenoderia macrolepis. 



Shell pyriform, compressed, with a broad neck gradu- 

 ally extending from the body, and terminating in an 

 oblique, elliptical mouth, and with the broader surfaces 

 composed mainly of a pair of hexahedral plates, from 

 which the neck is extended below. Length, 20/* to 



ju. 



Hob. Sphagnous swamp. 



