DUBLIN university zoological and botanical association. 
263 
up central corpuscles , not “vesicles”—bodies similar, in fact, 
to those in Spirogyra, &c_some entirely shattered, when they 
lose their light-coloured appearance; also representing the 
granules of the extruded cell-contents, as breaking off and set¬ 
ting up their molecular motion in the surrounding water. 
Fig. 5. Three joints of a filament of Leptocystinema asperum = Docidimn 
asperum (Brel).), magnified 330 diameters, showing the con¬ 
tracted mass of endochrome, with its central corpuscles, and 
in two of them the pale central interruption (which, however, 
is not always present). I have introduced this drawing be¬ 
cause, so far as my experience goes, that in Ealfs’ does not show 
the normal state of the cell-contents, but an irregular, some¬ 
what densely scattered condition (possibly preparatory to 
decay), and without any pale central interruption, or series of 
corpuscles, nor is it exhibited as filamentous. In this, as well 
as Leptocystinema Kinahani when kept for a length of time in 
the house, and evidently decaying, I have found the cell- 
contents broken-up and scattered, and the characteristic smooth 
compressed state of the endochrome very considerably altered. 
Fig. 6 . Three joints of a filament of Leptocystinema Portii, magnified 
330 diam. 
Fig. 7. A portion of a filament of Splicer ozosm a pulchellum, magnified 
450 diam. 
Fig. 8 . Front view of the quadrangular variety of Staurastrum 
O'Mearii, magnified 450 diam. 
Fig. 9. End view of the same, magnified 450 diam. 
Fig. 10 . Front view of the triangular variety of the same (St. O'Mearii), 
magnified 450 diam. 
Fig. 11 . End view of the same, magnified 450 diam. 
Fig. 12 . The triangular variety of the same, front view, in a partially 
advanced state of self-division, magnified 450 diam. 
Fig. 13. Sporangium of same, magnified 450 diam. 
Fig. 14. Penium Berginii (mihi), a specimen 4 I 5 of an inch in length, 
magnified 330 diam. 
Fig. 15. The same, after division, magnified 330 diam., the new, parti¬ 
ally grown segments still remaining apparently attached by 
their extremities. 
Fig. 16 . End view of quadrangular variety of Staurastrum monticulosum 
(Breb .), magnified 330 diam. 
Fig. 17. Unicellular plant, showing a small specimen, 200 of an inch in 
diameter, magnified 120 diameters, referred to at page 124, 
after division and the entire completion of two new spherical 
cells. One (the upper) is represented as slipping out from the 
loose original outer coat. See also M. Hofmcister’s figures, 
l.c., Plate I., Figs. 28, 29, which are, I suppose, magnified 300 
diam., although this, with regard to the figures referred to, 
unfortunately, is not stated. 
