108 BRITISH FRESHWATER, RHIZOPODA. 



Wicklow (Archer ; Hoplc.) ; Kerry ; West of Ireland 

 (Archer}. 



The plasma is generally very clear; it contains 

 numerous bright granules and small vacuoles, but 

 food-particles, when present, are always few in number; 

 the nucleus is large and distinct, it may occasionally 

 contain more than one nucleole. When deprived of 

 fresh air or water the plasma exudes, forming a clear 

 spherical globule around the aperture. 



Small groups of two or three individuals often occur, 

 but never colonies as in Microgromia socialis. 



The filose pseudopodia often arise from a portion of 

 the plasma which is spread around the exterior of the 

 aperture. 



The small examples sometimes seen may represent 

 immature individuals, the supple test perhaps allowing 

 for a natural increase in size. From Thirsk in 

 Yorkshire an individual was obtained having a heart- 

 shaped test and possessing two nuclei ; this was 

 probably a double or twin test and not a case of 

 division. 



2. Lecythium mutabile (Bailey) Hopk. 

 (Plate LI, figs. 8 and 9.) 



Corycia 



DUJARDIN in Ann. Sci. nat. ,(3) XYIII (1852), p. 240. 

 CLAPAREDE & LACHMANN Etudes Inf. et Bhiz. I, 2 (1859), p. 453. 

 PRITCHARD Hist. Infus., ed. 4 (1861), p. 550. 



LEIDY in Proc. Acad. Philad. 1874 (1875), p. 227 ; op. cit. 1878, p. 172. 

 Pamphagus mutabilis 



BAILEY in Amer. Jrn. Sci. (2) XY (1853), pp. 341-347, 40 figs. ; in 



Qrt. Jrn. Micr. Sci. I (1853), pp. 295-299. 

 GREENE Protozoa (1858, 1863, and 1871), p. 8. 

 ARCHER in Qrt. Journ. Micr. Sci. (N. s.) XI (1871), p. 101 ; op. cit. 



(N.S.) XII (1872), pp. 195, 423; in Proc. Dublin Micr. Club, II, 1 



(1873), pp. 27-28, 121 ; op. cit. II, 2 (1874), p. 153. 

 LEIDY in Proc. Acad. Philad. 1878, p. 172 ; Freshw. Khiz. N. Amer. 



(1879), pp. 191-194, pi. xxxiii, if. 1-9. 

 PARONA in Boll. Scient. II (1880), pp. 47, 48. 

 HITCHCOCK Synops. Freshw. Rhiz. (1881), p. 32. 

 TARANEK in Sitzb. bohm. Ges. Wiss. 1881, pp. 224, 233. 

 BLOCHMANN Mikr. Thierw. Siisswass., ed. 2 (1895), p. 19, pi. i, f. 27. 



