26 DAVENPORT ACADEMY OF SCIENCES. 



green in color. A dense zone of tangentially arranged spicules 

 on the periphery. Pseudopodia as in Adinophrys sol. 



Raphidiophrys viridis Archer. 



Found usually in aggregated groups of variable number. Bod- 

 ies colorless or filled with green chromatophores. Spicules con- 

 spicuous and slightly bent. 



Diameter of the bod}^, 75 microns. (Fig. 39, PI. VI.) 



What I have considered to be isolated forms of this species 

 have frequently been found in Johnson county, although none at 

 the time of observation were chlorophyl bearing. The presence 

 and arrangement of the peripheral layer of spicules, however, leads 

 me to believe that the organism should be classified here. At 

 times these bacteria-like spicules are tangentially arranged in the 

 investing layer of protoplasm, the body presenting a smooth con- 

 tour; frequentl}^ however, the spicules are arranged more radi- 

 ally, crossing each other at sharp angles and may be seen extend- 

 ing along the bases of the pseudopodia. The pseudopodia are ray- 

 like, equalling in length the diameter of the body. 



Reproduction has often been observed to take place as in Adin- 

 ophrys sol. Found among algae. 



Figure 39, Plate VI, illustrates a sj^ecimen from Johnson county. 



Order, DESMOTHORACIDA. 



CLATHRULINA Cienkowsky. 



Body spherical, enclosed within a latticed capsule and attached 

 by a stem. Pseudopodia simple, ray-like. 



Clathrulina elegans Cienk. 



Protoplasm of the body granular, when mature enclosed within 

 a capsule of silicious material, and attached by a thread-like, tubu- 

 lar stem. 



Diameter of capsule, 45 microns. (Figs. 40 and 42, PI. VI.) 



This species is one of the most beautiful of fresh water Proto- 

 zoa. It is, however, a rare form. The latticed shell is a mark 

 of maturity, young forms for a period after separation from the 

 parent cell showing no indication of such a covering. 



Pseudopodia which protrude through the irregular shaped open- 

 ings of the shell are in all respects similar to those of Adinophrys. 



