256 FEESH-WATER RHIZOPODS OF NORTH AMERICA. 



In the account of Vampyrella, previous observers do not indicate the 

 existence of the peculiar pin-like rays as I have apparently seen and 

 described them, but they refer to certain remarkable and similar move- 

 ments of granules, with which the pin-like rays seem to accord It was 

 not until after I made observations on the creature I have supposed to be 

 Vampyrella, that I read the descriptions of the latter, and it has occurred 

 to me that the appearance of the pin-like rays as above indicated may have 

 been illusory. Since this view has occurred to me, I have not had the 

 opportunity of repeating my observations. 



Besides the pseudopodal rays, Vampyrella frequently projects digit- 

 like or lobular processes or broad wave-like expansions of clear or faintly 

 granular protoplasm, as seen in figs. 10-13. These are quickly produced 

 and as quickly disappear. 



In motion, the body of Vampyrella was occasionally noticed to undergo 

 slight change of shape from spheroidal to oval; but I was not so fortunate 

 as to observe it undergo the remarkable changes indicated by others. 



DIPLOPHRYS. 



Greek, diplous, double; ophrus, eyebrow. ' 



JJiplophrys : Barker, 1868. Acanthocystis : Greetl', 1869. Cystophrys : Archer, 1869. Elosorhanis : Greeff, 

 1875. 



Animal minute, spheroidal, provided with a delicate, homogeneous, 

 membranous investment, with a pair of oral orifices slightly lateral to the 

 opposite poles. The interior, transparent, slightly granular protoplasm with 

 a central nucleus, several pulsating vesicles, and usually a single, bright, 

 yellow or red, oil-like globule. Pseudopods delicate, filamentous, and 

 radiant in a tuft from both oral orifices. The young associated in groups, 

 often of many individuals 



DIPLOPHRYS ARCHER! 



A minute rhizopodous-form. Barker: Quart. Jour. Mio. Sc. vii, 1867, 232. 



Diplopknjs drcheri. Barker: Ibidem, viii, 1868, 123.— Archer : Ibidem, 123.— Hertwig and Lesser: Arch. 



iuik. Auat. x, 1874, Suppl. 139, Taf. iii, Fig. 9.— Greeff: Arch. mik. Auat. xi, 1375, 15, pi. i, 



Fig. 11-13.— Schulze : Ibidem, 127, Taf. vii, Fig. 10-15. 

 Acanihobyslis gpiniferat Greeff: Arch. mik. Nat. v, 1869. 495, Taf. xxvii, Fig. 24-29. 

 Cyslophrys oeulea. Archer: Quart. Jour. Mio. Sc. ix, 1669, 265, 421, pi. xvii, fig. 3; x, 1870, 18, 22, 101; 



xi, 1871, 144. 

 A very minute or "Diplophrys-lilce" organism. Archer: Quart. Jour. Mic. Sc. ix, 1869, 323; x, 1870, 102; 



xi, 1871, 145, pi. vi, iig. 9, pi. vii, fig. 10. 

 Elworhmis eincta. Greeff: Arch. mik. Auat. xi, 1875, 23, Taf. i, iig. 10. 



