DIFFLUGIA BACILLAEIAKUM. 



29 



In bog-pools in Delamere Forest, Dunham, and else- 

 where in Cheshire ; frequent in North Wales. 



This variety comprehends a number of forms, all of 

 which possess the characters specified, with, however, 

 some modifications. Those incrusted with sand-grains, 

 some of which are figured by Penard (' Faune Rhiz. 

 Leman,' p. 237) may belong to the var. Solowetzldi. 

 It is desirable to confine var. elegans to those which 

 have a chitinous test, are diatom-covered, and more or 



.-,( ) 



FIGS. 48-50. Varieties of Dijflugia bacillariarum. Fig. 48. Var. 

 elegans. After Penard (as Difflugia elegans) ' Faune Ehiz. Leman/ 

 p. 237, fig. 1. Fig. 49. Var. teres. After Penard (as D. elegans var. 

 teres) ' Sarc. grands Lacs,' p. 16. Fig. 50. Var. Solowetzkii. After 

 Mereschkowsky (as D. Solowetzkii) in ' Arch. mikr. Anat.' XVI, t. x, 

 f . 17. All x about 280. 



less transparent. Wherever the organism occurs it is 

 usually plentiful, and individuals inhabiting the same 

 water, and even the same drop, exhibit a remarkable 

 range of forms. 



10. [?] Difflugia curvicaulis Penard. 

 (Plate XIX, fig. 8.) 



Difflugia curvicaulis PENARD in Rev. Suisse Zool. VII, 1 

 (1899), p. 36, t. iii, ff. 2-6; Faune Rhiz. Leman (1902), 

 p. 242, ff. 1-4 (p. 243) ; and Sarc. grands Lacs (1905), 

 p. 16, f. (p. 17) ; LEVANDER in Acta. Soc. Fauna Fenn. 

 XX (1901), 8, p. 12, f. (p. 13) ; AVERINTZEV in Trudui 



