238 Hazen: Lire HISTORY OF SPHAERELLA LACUSTRIS 
a great increase of synonyms if this revival were to hold, for it 
would necessitate the change of name of the large number of 
species of the fungus genus Sphaerella established by Cesati and 
De Notaris in 1863. 
As for the first objection, in spite of the fact that the original 
characterization of Sommerfelt's genus is brief and under it is in- 
cluded a species now known to belong to another genus (Pa/mel/a 
botryoides (Lyngb.) Kütz.), nevertheless the well-known species 
Sphaerella nivalis is placed first and the genus was evidently 
founded on it. The second objection has no weight, certainly at 
the present time, for most of the species of the genus of Cesati 
and De Notaris have now been transferred* to Mycosphaerella, a 
genus established in 1885 by Johanson} to take the place of the 
genus of Cesati and De Notaris. 
It is clear, then, that the name Daan established by 
Agardh in 1828 must give way to Sphaerella established by Som- 
merfelt (24) four years earlier. 
In the following list I have omitted Haematococcus mucosus 
Morr., first identified with our species by Rabenhorst ('68) be- 
cause I cannot recognize in Morren's description or figures any 
sufficient resemblance to Sp/iderclla. I have added Disceraca 
purpurea Morr. which, though it is identical with our species and 
was so regarded by Cohn ('50) and Perty (52), has been omitted 
from other lists of synonyms, probably because Morren considered 
his organism an animal. 
It may be remarked that among modern zoólogists Stein and 
Bütschli have included our alga, together with the rest of the Vo!- 
vocaceae, in the Protozoa, but Saville-Kent and most authors of 
biological text-books have—with more justice as it appears to us 
—relegated it to the plant realm. . 
SYNONOMY 
Volvox lacustris Girod. Rech. chim. et mic. 54, 186. 1802 
Protococcus monospermus Corda; Sturm’s Deutschland’s Fiori g: 
1829-32. 
Disceraea purpurea Morren. Rech. phys. sur les Hydroph. d. Belg. 5: 
37-43; 4: 42-45. Nouv. Mem. Acad. Roy. Sci. Brux. 14: 1841. 
* See Engler and Prant!. Die nat. Pflanzenfam. 1!: 423-426. 1897. 
T Givers. af K. Svensk. Vet. Akad. Fórhand. 41?: 163, 164. 1885. 
