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I attempt to add below brief diagnoses of those forms on 

 PI. XX, which to my eyes assume a position to a great 

 extent independent from the more common fresh-water rhizo- 

 podus genera represented by Difflugia, but which, like those 

 more nearly allied to the Radiolaria, seem to me not yet suffi- 

 ciently known or defined to be placed in special recognised 

 groups or orders. Hence they must just follow without any 

 attempt thereat ; although, indeed, Claparede and Lach- 

 mann place their Pleurophrys under Actinoj)hryna, my 

 figures 1 to 6 seem to be as little comparable to that group as 

 to Amoebina. I begin with — 



Genus Pleurophrys (Clap, et Lachm.). 



Pleurophrys spherica ? (Clap, et Lachm.), Arch. 

 PL XX, fig. 1. 



Specific characters. — Large, orbicular, elliptic, or somewhat 

 irregularly shaped. Body not filling the cavity of the test, 

 containing a large granular nucleus; pseudopodia slender, 

 slightly tapering, hyaline, pellucid, non granular, rather 

 straight, comparatively rigid, somewhat branched, very inert. 

 Test brownish, composed of somewhat elongate and granular 

 particles, agglutinated together by a common organic {?) sub- 

 stance. 



Measurements. — So varied in figure as not to present any 

 very definite distinction of length and breadth ; the largest 

 specimens probably as much as i-hj ' iri diameter. 



Localities. — Sparingly in Co. Wicklow, not yet seen in 

 other localities, but probably to be found in similar situations 

 hereafter, when better sought for. 



Pleurophrys ? amphitremoides (Arch.). 

 PL XX, fig. 2. 



Specific characters. — Rather small, elliptic, or suborbicu- 

 lar, body seemingly filling the cavity of the test, and some- 

 times coloured by chlorophyll-granules ; pseudopodia like the 

 last, but someivhat more branched ; test more or less densely 

 covered by diatomaceous frustules or arenaceous particles. 



Measurements. — The largest met with in length about 

 ', breadth ^-g-o", but variable in dimensions. 



Localities. — Very sparingly in pools in Co. Wicklow and 

 other places. 



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