242 FEESH-WATEB EHIZOPODS OP NOETH AMEEICA. 



the intervals of the nearly uniform, clear vacuoles, is mingled with bright 

 green clilorophyl granules. A thin layer of protoplasm at the surface of the 

 body is free from the latter, and gives off numerous simple rays, as in 

 Actinophrys sol. A single contractile vesicle presents the usual phenomena, 

 as in the latter. 



Actinophrys picta is comparatively rare, and I have found it only in the 

 ponds of cedar and sphagnous swamps in New Jersey. It may be the 

 same as the Actinophrys viridis of Ehrenberg, though I believe the weight 

 of evidence is in favor of the latter being the more common Heliozoan 

 hereafter described as Acanthocystis chcetophora. 



The size of the green Sun-animalcule above described is about 0.1 

 mm., with the rays of the same length. 



With the preceding I have observed bright green Heliozoans, as rep- 

 resented in figs. 5, 6, which may pertain to the same animal, though they 

 possess some peculiarity. The body, instead of having a foamy appearance, 

 as in Actinophrys sol, is composed of colorless granular protoplasm, with 

 numerous but variable proportions of bright green clilorophyl corpuscles. 

 These are much larger than the green granules of the animal above referred 

 to Actinophrys picta, and are especially accumulated in an intermediate zone 

 of the body. A clearer central spot indicates the presence of a nucleus. 

 A contractile vesicle was observed in the usual position, as in Actinophrys 

 sol, and as seen in fig. 5, but it was less active in its movements, and in 

 some individuals was not detected or appeared not to exist. 



The pseudopods have the same character as in Actinophrys sol, but 

 commonly were fewer, and often coarser. Individuals range from 0.056 

 mm. to 0.1 mm. in diameter, with the rays about equal in length to the 

 latter. The green chlorophyl corpuscles measure from 0.004 mm. to 0.006 

 mm. 



HETEROPHILS. 



Greek, heteros, diverse ; ophrus, an eyebrow. 



Animal resembling Actinophrys in general form, constitution, and 

 habit, but ordinarily with the body enveloped with a thick stratum of proto- 

 plasm defined by a granulated or thickly villous surface, and penetrated 

 by the pseudopodal rays. 



