RHIZOPODS. 125 



with the cavity of the shell, but the animal proba- 

 bly builds them for ornament, as it does not seem 

 to use them. The mouth of the shell occupies the 

 end opposite to the spine - bearing summit, and 

 when the shell is turned over so that this opening 

 is directed upward, it will be seen to be lobed or 

 scalloped, the lobes varying from six to sixteen, 

 being usually about twelve. They may in some 

 forms be rather sharp -pointed, almost like short 

 teeth. They are directed towards each other across 

 the opening. It is a difficult matter to get the 

 shell in such a position that the 

 observer can look down into the 

 mouth, but it may sometimes be 

 done by tapping the cover-glass with 

 a needle so as to roll the Khizopod 

 about, and occasionally, by one of 

 those lucky accidents that some- 

 times occur, it places itself in good 

 position. The soft body is colorless or brownish, and 

 the pseudopodia are thick, blunt, and numerous. The 

 species is common in the ooze. D. corona, Fig. 98. 



3. Shell spherical, without spines ; mouth circular, 



smooth, without lobes or teeth. This species is 

 found with the preceding. D. globulosa. 



4. Shell long and narrowly pear-shaped, the summit 



prolonged into a central sharp point ; mouth circu- 

 lar, smooth, without teeth or lobes. Common. D. 

 acumindta. 



