130 DUBLIN XJNIVEKSITr 



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 Ralfs' 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. Portion of filament of Sphcerozosma pulckellum, magnified 450 dm. 



Fig. 8. Front view of the quandrangular variety of Staurastrum 

 CfHearii, 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 ^fs 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, «fa 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. Hofmeister's figures, 

 I.e., 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. 



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