ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 631 



are described, and the likeness between this genus and CUloromonas 

 Gobi is discussed. A genealogical tree of these and allied genera shows 

 the author's views as to the relationship existing between them, starting 

 from Polyblepharideae. Certain new species are described very fully 

 and a key is «;iven of the species of Chlamydomonas and Chloromo/ias, 

 followed by descriptions of the less known species. Finally 23 doubtful 

 species are enumerated which are either incapable of identification or 

 cannot be included in either of the above genera. References and 

 notes accompany each name. 



Note xii. shows that Sphcerocystis Schrocteri Chod. is identical with 

 Glaococcus mucosas A. Br., and the author agrees with A. Braun that 

 its systematic position is with the ChlamydomonaceEe, rather than with 

 the Palrnellacese, where Chodat placed his species. The author con- 

 siders that the genus Glonococcus together with Chlorogonium and 

 Pliysocytium form a connecting link between Chlamydomonas and 

 Tetrasporacese. 



Note xiii. deals with Pteromonas nivalis Chodat, which according 

 to the author is already known as Astasia nivalis Shuttleworth. The 

 material at his disposal does not allow him to pronounce definitely on 

 the true position of the species, but he is inclined to regard it as repre- 

 senting a new genus. He gives details as to the structure and cell- 

 contents. 



In note xiv. the author shows that Cerasterias nivalis Bohlin must 

 not only be excluded from that genus but must be reckoned as a fungus. 

 The name Chionaster is proposed for it and a description of the genus 

 is drawn up. It is suggested that it may belong to the Chytridineas or 

 it may represent a special family ; and that it has branched off from the 

 algal genus TetraMron, having adopted a saprophytic mode of life and 

 so lost its chlorophyll. 



Spores of Vaucheria.* — H. C. Bastian describes stages in the 

 resting and germinating spores of V.racemosa. He finds in each resting 

 spore one or more heaps of pigment-granules, the refuse products of 

 molecular transformation. They are unsurrounded by any bounding 

 membrane. In the germinating spore these pigment-heaps are said by 

 the author to appear as perfect spheres with sharply defined outlines and 

 gradually to exhibit independent movement. He considers that these 

 bodies pass through certain definite developmental phases and eventually 

 become independent amoeboid animal organisms, which have taken 

 origin from the substance of the Vavcheria plant. 



Nitella batrachosperma.f — Gr. Lilley redescribes and figures this 

 plant. It grows somewhat scantily in very shallow water in Pike Lake 

 near Duluth, and has a wide distribution in Europe and has been re- 

 ported from Australia. 



Chlorochytrium.J — H. Charlton Bastian has examined specimens of 

 Lemna minor, L. gibba, and L. trisulca, and has studied the various 

 stages of Chlorochytrium Knyanum growing within the intercellular spaces 



* Ann. Mag. Nat. Hist., xii. (1903) pp. 166-74 (1 pi.). 

 t Minnesota Bot. Studies, iii. (1903) pp. 79-82 (1 pi.). 

 t Ann. Mag. Nat. Hist., xii. (1903) pp. 175-86 (1 pi.). 



