AND THEIR CLASSIFICATION. 113 



Grenus DACTTLOSPHiERiFM, Hertwig <Sf Lesser. 



4. Dacttlosph^rium radiosum, BlocJwiann, Die mihr. Thier- 

 welt des Susswass., I. Protozoa (Hamburg, 1895), p. 14. — Amoeba 

 radiosa, ETirenb. 



Hah. Grortahork, Co. Donegal, Ireland. 



Erom the above locality a number o£ curious forms of this 

 Hhizopod were observed in whicb the pseudopodia were distinctly 

 twisted (fig. 2). This was not merely the condition of one or 

 two pseudopodia of a single individual, but was general among 

 the majority of the specimens. The condition was not brought 

 about by any specially applied stimulation, and, although the 

 pseudopodia exhibited slow movements, they made no attempt 

 to unwind themselves. The same state was noticed and figured 

 by Penard (in Mem. Soc. Phys. et d'Hist. ISTat. G-eneve, torn. xxxi. 

 no. 2, 1890, pi. 2. fig. 75) from Wiesbaden. 



Diameter of body 16-19 /x ; length of pseudopodia 23-46 //. 



Order Testacea. 



Family Arcellina. 



Genus Dipflugia, Leclerc. 



5. DiFFLUGiA ACUMINATA, Ehrenh. Infus. 1838, p. 131, pi. 9. 

 fig. 3 ; Leidy, Freslw. BUz. N. Amer. 1879, p. 109, pi. 13. 



Var. AMPHORA, G. S. West, in Journ. Linn. Soc, Zool. xxviii. 

 (1901), p. 319. — D. amphora, Penard, in Mem. Soc. Phys. et 

 d'Hist. Nat. Geneve, torn. xxxi. no. 2, 1890, p. 139, pi. 13. 

 figs. 55-65. 



Some strange forms of this variety were observed from T Foel 

 Eras, ]Sr. Wales, in which large num.bers of the empty cells of 

 Ghlorohotrys regularis, Bohlin, were incorporated with the shell. 

 They were certainly the most extraordinary Ehizopod-shells I 

 have ever examined. The cells of the alga are globular and 

 the cell-walls are siliceous, and the entire shell of the Bifflugia 

 appeared to be built up of an accumulation of the empty cells of 

 the unicellular alga. Length of shells 260-290 }i. 



6. DiFFLTTGiA SoLOWETZKii, MerescJik. ; Levander, ' Material 

 zur Kenntniss der Wasserfauna in der Umgehung von Helslngfors.^ 

 Acta Soc. jpr. Fauna et Flora Fennicce, xii. no. 2, 1894, p. 18, 



