130 MICROSCOPY FOR BEGINNERS. 



species, which is quite frequent in the ooze of ditches 

 and ponds. 



12. CLATHRULINA ELEGANS (Fig. 105). 

 A hollow globe of silicious lattice-work elevated on a 

 crystalline stem. Within this exquisite dwelling the 

 spherical, colorless animal lives, extending its fine long 

 pseudopodal rays through the almost circular windows in 

 search of food. The stem is attached to aquatic plants 

 or other submerged objects. Cloth- 

 rulma is the only fresh-water Rhi- 

 zopod that is not free - swimming. 

 It is common in many ponds, at- 

 tached to the rootlets of Lemna. 



In this small book it is only possi- 

 ble to refer to a very few of the com- 

 monest of these beautiful and in- 

 teresting animals, about whose life 

 history very little is known. They 

 PI'S. 105. ciathrniina eie- form a department in which there 

 is room for much original inves- 

 tigation. Those who desire to pursue the subject, or 

 to know more of the Rhizopods than can be included 

 here, would do well to refer to Dr. Leidy's " Fresh-water 

 Rhizopods of North America," published by the United 

 States Geological Survey of the Territories, or to Mr. 

 Romyn Hitchcock's " Synopsis of the Fresh-water Rhizo- 

 pods," a useful condensation of Dr. Leidy's splendid work. 



