112 



structures noticeable seem to lack the '' ceir'-cnaracteristics 

 present here and described for the " yellow cells" by Haeckel 

 in his beautiful and elaborate Monograph. These must pos- 

 sess a rigid and firm membrane or " wall/' granular (yellow) 

 contents, and a clearly defined nucleus, and they must sub- 

 divide by internal self-fission, a new nucleus appearing in 

 each half of the divided cell ; in these points, then, the cells 

 of C. Haeckeliana agree, with the exception of the wall 

 only (not the contents) being of a yelloAvish colour. I do not 

 yet see, indeed, that the ordinary structures met with per- 

 vading the general body-mass of certain rliizopoda can be 

 truly said to come under the same category as the cells of 

 my forms, and hence I think Wallich's views alluded to are 

 not yet justified. 



Further, I venture to think that Greef's suggested com- 

 parison of the green (chlorophyll) granules of A. turfacea 

 with the " yellow cells" is not tenable. I take these green 

 granules occurring in that form, as Avell as in Raphidioplirxjs 

 vir'idls, Heterophrys myriopoda, Pleurophrys amphitremoides, 

 occasionally in certain Difflugiae, &c., as all one and the same 

 thing — chlorophyll — either persistently or temporarily cha- 

 racteristic here, as in certain other lowly animal forms, and 

 can no more be the homologues of " yellow cells" in the one 

 than the other. 



Cysto]}hrys Haeckeliana (Arch.). 

 PI. XVII, figs. 1, 2. 



Specific characters. — Sarcode body-mass very polymor- 

 phous, colourless, granular ; inner cells rather large, orbicular, 

 their walls yellowish, thin ; contents bluish, granular ; nucleus 

 lohite, excentric ; nucleolus dark, very minute ; pseudopodia 

 slender, irregular, variable in length, granular, more or less 

 arborescent, and the branches occasionally inosculating. 



Measurements. — Size of examples variable. Diameter of 

 inner cells about ttW" to as small as -^rrliro" • 



Localities. — One or two pools in Gallery and Carrig neigh- 

 bourhoods, very sparingly rare. 



Affinities and Differences. — Distinguished at once from the 

 following by its large orbicular central cells, with pale (not 

 reddish) nucleus, and its granular arborescent (not linear 

 and unbranchcd) pseudopodia. 



Cystophrys oculca (Arch.). 

 PL XVII, fig. 3. 



Specific characters. — Sarcode body-mass maintaining more 



