RHIZOPODS. 129 



shell against the slide or other object over which it 

 creeps. 



1. Shell without spines, or with four or 



six near the summit and arranged 

 in a circle at equal distances apart, 

 pointing upward and varying some- 

 what in length. Quite common in 

 the ooze of ponds. Euglypha alve- m. m- 

 oldta, Fig. 103. alveol * ta - 



2. Shell with a cluster of spreading spines springing 



from the centre of the summit. Common in 

 Sphagnum. K cristdta. 



3. Shell with the summit and sides fringed with bris- 



tles. Common in Sphagnum. E. cilidta. 



11. CYPHODEKIA AMPULLA (Fig. 104). 

 Shell yellowish, or sometimes colorless, shaped like a 

 chemist's retort, the mouth being at the narrow, curved 

 end. The summit is rounded, sometimes with a cen- 

 tral point or small knob. The shell, when highly mag- 

 nified, is seen to be formed of minute hexagons. The 

 animal is, as usual, colorless, and nearly fills the semi- 

 transparent case. The pseudopodia are 

 numerous and often forked. When mov- 

 i n g> the mouth of the shell is in contact 



deria ampulla. w j th ^ ob j ect oyer wh j cll fa Q RhizO- 



pod is travelling, and the body of the shell is held 

 obliquely upward or almost parallel with the slide. 

 The figure shows an empty shell. There is but one 



