128 MICROSCOPY FOR BEGINNERS. 



dined, so that when in motion with the mouth down- 

 ward against the slide the rounded summit is lifted 

 obliquely upward. It is somewhat narrower at the 

 lower part, and the mouth is a short distance within 

 the shell, the front or lower edges seeming to curve in- 

 ward to meet it. The body of the animal is colorless. 

 The pseudopodia are very fine, thread-like, and few in 

 number. The Rhizopod is common everywhere in wet 

 places ; it is also one of the smallest, and the shell is 

 often found dead and empty. The figure shows it in 

 side view. The aperture of the shell is seen to be bead- 

 ed when examined with a high-power objective. 



10. ETJGLYPHA (Fig. 103). 



The shell of Euglyplia is ovoid, colorless, and trans- 

 parent. Under a high power it is seen to be composed 

 of many oval or hexagonal plates arranged in rows, 

 those towards the widest part of the shell overlapping 

 those in front. The mouth is circular or oval, but the 

 projecting points of the plates give it a toothed, saw- 

 like edge. There are several species, but they all may 

 be known as Euglyphae by this serrated or saw-toothed 

 mouth. The upper part and the borders of the shell 

 are either with or without spines, or they may bear fine 

 hairs. The animal itself is colorless, and almost entire- 

 ly 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-bearing forms, with the mouth of the 



