1880.] 



MICKOSCOPICAL JOURNAL. 



11 



Most of the rhizopods live in the 

 sea ; tliese have recently been stu- 

 died by M. Schultze and E. Hackel. 

 In the following classification only 



Pseudopodia fine, branching, somewhat changeable, 

 Pseudopodia thick, very changeable 



the common fresh-water forais are 

 given, some of which are placed, 

 by many authors, among the Infu- 

 soria. 



Actinophryina, 

 Amcebina. 



I. Family, Actinophryina. 



The body shows a difference between the outer coat and the inner portion. The 

 pseudopodia placed upon the outer coat are thin, pointed, simple or branched, some- 

 times anastomosing. Movement very slow. 

 Body without an outer test, 



pseudopodia radiating from the entire surface, Actinophrys. 



pseudopodia not covering the entire surface, 



in a belt encircling the body, Trichodiscus. 



lateral, in a bunch, Plagiophrys. 



Body with an outer test, 

 test free, not fixed, 



not incrusted with hard particles, 

 finely sculptured, 



elongated, with terminal aperture, Euglypha. 



retort-shaped, with lateral aperture, Cyphoderia. 



not sculptured, structureless, membraneous, 



elongated, with lateral opening, Trinema. 



spherical, Gromia. 



incrusted with foreign particles, Pleurophrys. 



test provided with a long pedicle, Clathrulina. 



1. Genus, Actinophrys. Ehr. The 

 spherical body of the animal ap- 

 pears almost frothy, owing to nu- 

 merous vacuoles ; near the surface 

 a large contractile vesicle appears, 

 which projects outwards. The ra- 

 diating pseudopodia have an axis of 

 somewhat firmer consistence. 



A. Sol. Ehr. Parenchyma alve- 

 olate, excepting a small, central, 

 thick portion. Passing outwards 

 the alveolae increase in size.* A 

 circular nucleus, with a nucleolus 

 in the centre. Size as large as 

 0.06 d. Common. 



A. Eichornii, Ehr. {A. Sol. Kol- 

 liker, Actinosphmrium Eichornii, 

 Hack el, Hertw., and Lesser.) Body 

 spherical, vacuolated throughout, 

 inner part distinctly separated 

 from the outer coat. The latter 

 with large, radial, vacuoles, and 

 several contractile vesicles : the 

 former with small, polygonal, thick- 

 walled vacuoles, and numerous nu- 

 clei, size 0.04^0.4. Not uncom- 

 mon in stagnant water. 



2. Gen. Trichodiscus, Ehr. Body 

 spherical, with .an equatorial zone 

 of pseudopodia. 



T. Sol. Ehr. 0.055—0.111 d. 

 Among water-plants, not common. 



3. Gen. Plagiophrys, CI. and 

 L. Body spherical ; pseudopodia 

 streaming out from one part in a 

 bunch, branched, rarely anastomos- 

 ing. Nucleus simple, contractile 

 vesicle not noticeable. According 

 to Hertweg and Lesser, the body is 

 enveloped by a thin, close, mem- 

 braneous lorica ; in such case these 

 forms f>roperly belong to the suc- 

 ceeding group. 



P. Sphierica, CI. 0.03—0.04 d. 

 According to Claparede, vesicle 

 present. In river-water, not com- 

 mon. 



P. Oylindrica, CI. Length 0.13, 

 breadth yi the length. 



Pseudopodia terminal. Among 

 algae, rare. 



4. Gen. Euglypha, Duj. Shell 

 ovoid or flask-shaped, formed of 

 hexagonal, spirally-arranged, plates. 



