248 FRESH-WATEE RHIZOPODS OF NORTH AMERICA. 



elliptical and then elongated piriform, a small portion, of elliptical shape, 

 gradually extended itself from the main portion, and remained connected 

 with it by a narrow isthmus of clear protoplasm, in which condition the 

 animal presented the appearance seen in fig. 5. Watching the creature with 

 the expectation of seeing the smaller portion separate and become a dis- 

 tinct individual, after some time it was observed to be gradually withdrawn 

 into the main portion. Subsequently the animal became ovoidal, and then 

 assumed an irregularly quadrate outline with festooned borders, as repre- 

 sented in fig. 6. Later it continued to undergo changes of the same general 

 character so long as it was convenient to observe the animal. 



This creature bears some resemblance to the subjects of Focke's figs. 

 2, pi. xxv, of the Zeitschrift fur wissenschaftliche Zoologie for 1868. 



RAPHIDIOPHRYS. 



Greek, rapkis, a needle ; ophrus, an eyebrow. 



Animal ordinarily associated in groups of variable number, closely 

 aggregated or conjoined by isthmus-like bars. Individuals of Actino- 

 phryan form, consisting of a soft spheroidal body of granular protoplasm, 

 with oil-like molecules and variable proportions of clear colorless or bright 

 green corpuscles, and with a large central nucleus. Exterior of the body 

 invested with a thick layer of delicate, colorless protoplasm, extending in 

 tapering processes on the pseudopodal rays and densely pervaded with 

 minute spicules tangentially arranged. Pseudopodal rays very long, 

 numerous, straight, simple, and finely granular. 



RAPHIDIOPHRYS VIRIDIS. 



Raphidiophrtjs viridis. Archer: Quart. Jour. Mic. Sci. 1870, x, 103, pi. xvi, fig. 2. 



Animal single, or more commonly in closely aggregated groups of 

 variable number. Individuals more or less bright green from the presence 

 of chlorophyl corpuscles (and probably at times colorless from the absence 

 of these). Spicules of the exterior envelope thickly distributed and 

 extending outwardly on the bases of the pseudopodal rays, comparatively 

 coarse and slightly bent. 



Size. — About ^th of an inch (Archer). 



Locality. — Ireland. 



