AMOEBOID PROTOZOA (SARCODINA) 



167 (166) Envelop with more or less closely united spicules. 



235 

 168 



168 (175) With a thick protoplasmic envelop in which are imbedded skeletal 

 elements in the form of spicules or plates. 



Order Chalarothoraca . . 169 



169(172) Skeletal elements loosely connected i^q 



170 (171) Spicules chitinous, radiating between the pseudopodia. 



Hekrophrys Archer. 

 Representative species. . . . Hekrophrys myriopoda Archer 1869. 



In this species the envelop is mucilaginous, its outer border pre- 

 senting a villous appearance due to the arrangement of the spicules. 

 Ray-like pseudopodia penetrate the envelop. This organism is 

 known to take possession of spicules from species of related genera, 

 probably from discarded skeletons, and make them a part of its 

 own envelop. Endoplasm usually green with symljiotic algae. 

 Nucleus single. A contractile vacuole is not always observed. 

 Habitat marshes and standing water. Diameter 70^. 



Fig. 357. Heterophrys myrioPoda. x 190. (After Penard.) 



171 



(170) Spicules siliceous, scattered through the envelop and surrounding 

 the bases of the pseudopodia. . . . Raphidiophrys Archer. 

 Representative species. 



Raphidiophrys ekgans Hertwig and Lesser 1874. 



The spicules are semicircular, with their convex surfaces 

 toward the body and pseudopodia. Nucleus single. One 

 contractile vacuole. Chlorophyl sometimes present. Often 

 numbers of these individuals are grouped into colonies, joined 

 by protoplasmic processes. Habitat among aquatic plants. 

 Diameter 30 m. 



R. viridis Archer diflfers from R. ekgans in the fusiform spic- 

 ules and the constant presence of symbiotic algae. 



Fig. 358. Raphidiophrys ekgans. X 150. (After Leidy.) 



172 (169) Skeletal elements closely united, forming a compact envelop. 173 



173 (174) Spicules siliceous, globular, completely surrounding the body. 



Pompholyxophrys Archer. 

 Representative species. . . Pompholyxophrys piinicca Archer 1869. 



The spicules usually in three rows about the body. Endoplasm re<l- 

 dish. Nucleus spherical, large. No contractile vacuole. PscudojxKlia 

 very fine and indistinct. Habitat among aquatic plants in ponds antl 

 in swamps. Diameter 25 to 30 /i. Leidy records this species from 

 New Jersey as Uyalolampe Jeneslrata Greeff. 



Fig. 359. Pompholyxophrys punicea. X 200. (After Penard.) 



