AMONG SIMPLE SA.RCODE ORGANISMS. 407 



points, and seldom anastomose. He describes a narrow membra- 

 nous margin surrounding the orifice and overlooked by otber ob- 

 servers. 



Among specimens obtained from the Baltic, Schulze has occa- 

 sionally met with two individuals united to one another by the 

 pseudopodial extremities ; but he has not followed this phenome- 

 non further. 



Under the name of Cyphoderia truncata Schulze has described 

 a species in which the main axis is not curved, and has the shell- 

 orifice transverse to it ; but it is difficult to see how such a form 

 can be referred to the genus Cyplioderia. 



The genus Fleuroplirys was founded by Claparede and Lach- 

 mann for a freshwater monothalamian rhizopod which resem- 

 bles Difflugia in the fact of its test being composed of foreign 

 particles united by a cement excreted from the surface, while 

 it differs from this genus in its pseudopodia being filiform and 

 pointed instead of being finger-shaped and blunt. The P. sphce- 

 rica, Clap. & Lach., has been further studied by Archer and by 

 Hertwig and Lesser and F. E. Schulze, all of whom have de- 

 scribed new species. It appears to be an abundant form, though 

 it has been rarely noticed, a fact which Archer explains by calling 

 attention to the peculiar appearance of its test, which resembles 

 the excreta of Eotifers and other microscopic animals, and which 

 would thus easily cause it to be overlooked. The foreign par- 

 ticles incorporated in its test resist the action of concentrated 

 acids, and are probably siliceous. 



The pseudopodia issue from a rather large roundish orifice situ- 

 ated on one end of the longer axis. They are hyaline, very fine, 

 and pointed, divide frequently at acute angles, and anastomose 

 with one another. Hertwig and Lesser differ from Archer in 

 describing them as enclosing granules. Archer has demonstrated 

 the presence of a nucleus. 



Archer has noticed in Pleurophrys amphitrematoides, Arch,, the 

 presence of chlorophyl granules, a fact also observed in Difflugia, 

 but not elsewhere met with among the freshwater Thalamophora. 

 In examples of P. ampliitrematoides, however, examined by P. E. 

 Schulze, this observer has found the chlorophyl granules replaced 

 by round colourless refringent granules quite like them except in 

 the absence of colour. 



Hertwig and Lesser have frequently met with two individuals 

 in apposition by their pseudopodial openings, and with the pseu- 



