of England and India. 87 



plasm bearing the spherules ; e, nucleolus, with layer of granules 

 and central cavity ; /, chlorophyll-cells ; g, starch-granules. All 

 these figures are greatly magnified. 



Fig. 3. The same, efi'ete nucleus of the colourless specimens, after the 

 spherules have passed into the body of the animal : a, flocculent 

 matter, the remains of the nuclear protoplasm in which the sphe- 

 ndes were suspended ; b, nucleus, with layer of granules and 

 central cavity still remaining ; c, granuliferous cells (originally 

 the spherules of the nucleus, which have now passed into the 

 body of the animal) undergoing multiphcation by dupUcative 

 division ; d, starch-granules. All greatly magnified. 



Fig. 4. The same : a, granuhferous cells after they have passed from 'the 

 animal into the watch-glass, now become ciliated; b, small 

 AmoubcB which also appear in the watch-glass. All greatly mag- 

 nified. 



Fig. 5. Difflugia compressa, n. sp., magnified: c, broad side of test; 

 b, grains of hyaline quartz-sand ; c, narrow side ; d, grains of 

 quartz on the same ; e, e, pseudopodia ; /,/, dark collar-like mark 

 at the base of the neck of the test; g, h, i, k, dotted lines show- 

 ing respectively varieties in the form of the test ; I, aperture of 

 the circular variety. It should be remembered that the grains of 

 quartz, &c., are only partially delineated over the test, to save 

 trouble in the engraving. 



Fig. 6. The same, spheruliferous nucleus of; the spherules more or less 

 granuliferous : a, nucleolus ; b, brown cells ; c, yellow oil-glob- 

 ules ; d, starch-granules ; e, reproductive cells ; /, one under the 

 effect of iodine, showing that it is granuliferous, and not homo- 

 geneous like the starch-granule under the same circumstances. 

 All greatly magnified. 



Fig. 7. Difflugia urceolata, n. sp., magnified : a, grains of quartz ; b, pseudo- 

 podia ; c, reproductive cells ; d, oblong colourless cells or bodies 

 (the "granules" ?). The two latter much more magnified than 

 the test. 



Fig. 8. Difflugia aculeata, Ehr. ; magnified under surface : a, grains of 

 hyaline quartz ; b, aperture ; c, c, spines ; d, lateral view of the 

 same, showing a different arrangement of the spines ; e, minute 

 pieces of straight filaments, sometimes substituted by the animal 

 for grains of sand ; /, pseudopodia ; g, oblong variety, without 

 spines — under surface ; h, lateral view of the same ; i, circular 

 variety, with spines all round. 



Fig. 9. Difflugia spiralis, Bailey (mihi) ; magnified lateral view : a, test ; 



b, grains of hyaline quartz ; c, posterior view ; d, short filaments 

 arranged parallel to each other, but in a tortuous form, substi- 

 tuted for grains of quartz. 



Fig. 10. Difflugia ? magnified. Test empty; animal not seen. 



Fj^r. 11. Difflugia ? magnified ; colourless: a, pseudopodia. 



Fig. 12. Difflugia peltigeracea, n. sp. (provisionally so named), magnified; 

 scale jV th to 3^7 Voth of an inch : a, test ; b, form of scales ; 



c, body of animal in a passive state ; d, nucleus ; e, e, e, portions 

 of food ; /, fibrous matter forming a kind of diaphragm ; g, an- 

 other form of the same on the scale of ^th to g^^th of an inch 

 (for comparison in size with the rest of the tests on this scale). 



Fig. 13. Euglypha compressa, n. sp., magnified ; scale rVth to -j^^jTrth of 

 an inch : a, broad side of test ; b, scales near aperture ; c, the 

 same, a little further back; d, spines; e, narrow side; /, broad 

 side, on the scale of ^th to ^^-yth of an inch (for comparison) 



