130 AQUATIC MICROSCOPY FOR BEGINNERS. 



colorless, and almost entirely fills the cavity of the 

 shell, to which it is attached apparently by the summit 

 only. The pseudopodia are very delicate and often 

 branched. The animal moves, like all-the shell-bear- 

 ing forms, with the mouth of the shell against the 

 slide or other object over which it glides. 



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 somewhat in 

 length. Rather common in the ooze of ponds. 

 Eiiglypha alveoldta, Fig. 103. 



2. Shell with a cluster of spreading or diverging spines 



springing from the center of ' the summit. Com- 

 mon among Sphagnum. £. cristdta. 



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



tles. Common among Sphagnum. E. cilidta. 



II. CyPHODERIA AMPtiLLA (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 hav- 

 ing a central point or small knob. The shell, when 

 highly magnified, is seen to be formed of minute hex- 

 agons. The animal is, as usual, colorless, and 

 _„ nearly fills the semi-transparent case. 



The pseudopodia are numerous and often 

 I forked. When moving, the mouth of the 

 I shell is in contact with the object over 

 1 which the Rhizopod is travelling, and 

 the body of the shell is held obliquely 

 upward, or at times almost parallel with 

 ^ the slide. There is but one species, 



[r- which is rather frequent in the ooze of 



^'l^xt^ltr ditches and ponds. 



