144 BRITISH FRESHWATER RHIZOPODA. 



In the genus Micrometes (Cienkovsky), belonging to 

 the allied family Polystomina, the test may have from 

 three to six apertures, but up to the present time it 

 has not been recorded from the British Isles. 



SYNOPSIS OF THE BRITISH GENERA. 



Test very small, spherical, hyaline, smooth ; plasma 

 containing a coloured globule; when young often in 

 colonies. 1 . Diplophrys. 



Test of medium size, oval, smooth or encrusted with 

 foreign matter ; plasma usually containing algae living 

 in symbiotic relationship. 2. Amphitrema. 



Genus 49. DIPLOPHRYS Barker, 1868. 



Diplophrys BARKER in Qrt. Jrn. Micr. Sci. (N. s.) VIII 



(1868), p. 123. 

 Cystophrys ARCHER in Qrt. Jrn. Micr. Sci. (N. s.) IX (1869), 



p. 265. 

 Elseorhanis GREEFF in Arch. mikr. Anat. XI (1875), p. 23. 



Body spherical, with a thin, hyaline, homogeneous 

 envelope provided with two apertures ; plasma colour- 

 less, transparent, granular ; nucleus single ; several 

 pulsating vesicles usually present ; pseudopodia fila- 

 mentous, radiating. 



This genus contains only one species, which inhabits 

 fresh water. 



1. Diplophrys archeri Barker. 

 (Plate XLIV, figs. 12 and 13; PI. LVI, fig. 11.) 



Diplophrys archeri 



BARKER in Qvt. Jrn. Micr. Sci. (N. s.) VIII (1868), p. 123 ; in Proc. 



Dubl. Micr. Club, I, 3 (1869), p. 178. 

 HERTWIG & LESSER in Arch. mikr. Anat. X (1874), Suppl., p. 139, 



pi. iii, f . 9. 



GREEFF in Arch. mikr. Anat. XI (1875), p. 15, pi. i, ff. 11-13. 

 SCHTJLZE in Arch. mikr. Anat. XI (1875), p. 127, ff. 10-15. 

 ALLMAN in Jrn. Linn. Soc. XIII (1877), pp. 408, 409, f. 8. 

 BUCK in Zeits. wiss. Zool. XXX (1877), p. 34. 



