GENUS ACTINOPHRYS— ACTINOPHRYS PICTA. 241 



form, as seen in fig. 21. The isthmus of the latter then elongated, and 

 containing within it the nucleus and oil globules, fig. 22, in this condition 

 the Actinophrys nearly resembled the third stage, fig. 13, of the original 

 specimen. It was now midnight, and I was obliged to retire from my 

 observations. The next morning I could find nothing in the animalcula- 

 cage but a half dozen individuals of Actinophrys having the ordinary 

 appearance. 



During the whole time the Actinophryes retained their usual charac- 

 ters, with numerous rays divergent everywhere except from the isthmus, and 

 always a contractile vesicle exhibiting its ordinary rhythmical movements. 



Another mode of reproduction of Actinophrys sol, as observed and 

 described by Cienkowski,* I have not had the opportunity of seeing. Ac- 

 cording to this able investigator, the animal, preparatory to the reproductive 

 process, withdraws its rays and becomes a closed cell by the formation of an 

 exterior, sharply defined, investing membrane. The body loses its foamy 

 character, and becomes finely granular and more condensed centrally. 

 The more compact central portion after some hours divides into two masses, 

 and the exterior membrane with the remaining peripheral matter, excepting 

 a few granules, dissolves away. The pair of isolated balls then acquire 

 each an investing membrane, and the granular contents become somewhat 

 retracted from their wall, and are then provided with an additional investing 

 membrane. Finally, from each cell thus formed, a young Actinophrys 



makes its escape. 



ACTINOPHRYS PICTA. 



Plate XX, YT, Sg. 4. 



Animal having the same constitution and habit as Actinophrys sol, but 

 with the body of a bright green color, due to the presence of chlorophyl 

 mingled with the colorless granular protoplasm. 



Size. — From 0.056 mm to 0.105 mm. in diameter. 



Locality.— Ponds in sphagnous swamps at Absecom, Vineland, and 

 other localities in New Jersey. 



Actinophrys picta, as represented in fig. 4, pi. XLVI, closely resem- 

 bles the common Sun-animalcule, but possesses a bright green color. The 

 globular body has the same foamy aspect, but the protoplasm occupying 



* Archiv {. mik. Anatomie, 1865, 227. 

 1G EHIZ 



