. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . a few species of Cosmarium, Staurastrum and Xanthidium there are 1 The nuclear structure is well seen in various species of Gonatozygon, Closterium, Roya andMicrasterias. For nuclear structure in Closterium consult Lutman (10). 2 But for the untimely death (in 1912) of Dr J. Liitkemuller of Vienna we should have had bynow an exhaustive study of the chloroplasts of Desmids. Much of his work and most of hisdrawings were communicated to the pres

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. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . a few species of Cosmarium, Staurastrum and Xanthidium there are 1 The nuclear structure is well seen in various species of Gonatozygon, Closterium, Roya andMicrasterias. For nuclear structure in Closterium consult Lutman (10). 2 But for the untimely death (in 1912) of Dr J. Liitkemuller of Vienna we should have had bynow an exhaustive study of the chloroplasts of Desmids. Much of his work and most of hisdrawings were communicated to the present author, who deplores the loss of a valued corre-spondent and of the unwritten work founded upon many years of patient study. 3 As for example Cosmarium subtile (W. & G. S. West) Liitkein. and C. sultilissimumG. S. West. 364 Conjugate several parietal cushion-like chloroplasts in each semicell, but the parietaldisposition is not constant. In many species the chloroplasts are very variablein character and disposition, numerous intermediate states existing between \-/y~\ W- $$. ,V^W: OD! oo: DO ooj Q-g p:C • • . < , DO • • t pa bu. ir1 GQQ;

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