122 



Plewophrys ? falva (Arch.). 

 PL XX, fig. 3. 



Specific characters. — Minute, egg-shaped, body filling the 

 cavity of the test ; pseudopodia short, not straight, more or 

 less branched, hyaline ; test of a buff or tawny colour, and 

 covered by hyaline quartzose granules. 



Measurements. — Length and breadth respectively averaging 

 about one half less than the ]5receding. 



Localities. — Very sparingly in pools in same situations as 

 foregoing. 



Genus Amphitrema (Arch.). 



Generic characters. — Rhizopod giving off tivo tufts of 

 elongate linear branched pellucid pseudopodia, each tuft through 

 an aperture at opposite ends of a test more or less covered by 

 foreign arenaceous particles, the apertures provided ivith a 

 rim-like neck. 



Amphitrema Wrightianum (Arch.). 

 PI. XX, figs. 4, 5. 



Specific characters. — Body generally not filling the cavity 

 of the test, {always ?) including chlorophyll-granules ; oppo- 

 site tufts of pseudopodia unequal ; the compressed elliptic test, 

 with the foreign particles, more crowded at the margins, and 

 often obscuring the extremely short necks. 



No nucleus nor contractile vesicle detected, either in this 

 or the two latter forms referred to Pleurophrys. 



I have much pleasure in naming this form after my friend 

 Prof. E. Perceval Wright, in whose company the first exam- 

 ples I saw were met with, and along with whom the most 

 recently seen near Kenmare were taken. 



Measurements — .Length of test about ^-1—', breadth about 

 -j-i-ff''', but slightly variable in dimensions. 



Localities. — " Feather-bed Bog," Co. Dublin ; " Glen-ma- 

 lur," Co. Wicklow ; a boggy ])lace on the road between 

 Killarney lakes and Kenmare; as yet rare and local, but 

 doubtless more widely distributed. 



Affinities and Differences. — I am not aware of any mono- 

 thalamian Rhizopod with two apertures for emission of 

 pseudopodia, but there is no doubt a great affinity to such a 

 form as Pleurophrys? amphitremoides (mihi), but I never 

 could detect any neck to the test, however short in that form, 

 yet in the present it is often obscured by foreign particles. 



