420 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
forms. The characters are very inconstant, and Brady gives up the attempt to distinguish the group 
by precise and constant characters. 
Truncatulina lobatula Walker & Jacob. 
Synonyms: See Brady '84 for a long list. 
“It is impossible to define by any precise characters the morphological range of the present species. 
Its variations are infinite.” (Brady, p. 660.) 
This very common form, which occurs in all latitudes, was found frequently among the algse at 
Woods Hole. Its characters are so difficult to define that for the present I shall limit my record to 
this brief notice. Size of shell 230/< by 270//. 
Genus ACTINOPHRYS Ehr. 
The body is spherical and differentiated into granular endoplasm and vacuolated ectoplasm, but 
the zones are not definitely separated. There is one central nucleus and usually one contractile 
vacuole. The pseudopodia have axial filaments that can be traced to the periphery of the nucleus. 
Fresh and salt water. 
Actinophrys sol Ehr., variety. Fig. 5. 
Synonyms: See Schaudinn ’95. 
The diameter is about 50//; the vacuolated ectoplasm passes gradually into the granular endo- 
plasm. This is the characterization given A. sol by Schaudinn, and it applies perfectly to the fresh- 
water forms. If 1 am correct, however, in placing an Actinophrys - like form found at Woods Hole in 
this species, the description will have to he somewhat modified. In this form (fig. 5) there is no dis- 
tinction between ectoplasm and endoplasm, and there is an entire absence of vacuoles. The nucleus 
is central, and axial filaments were not seen. The single specimen that 1 found looked much like a 
Suctorian of the genus Sphserop'hrya, but the absence of a firm cuticle and the presence of food-taking 
pseudopodia with granule-streaming makes it a very questionable Suctorian, and 1 place it here until 
further study throws more light upon it. 
Diameter of body 40//; length of pseudopodia 120 to 140// . 
