438 THE AMERICAN NATURALIST. [VOL XXXIII. 
hemisphere. Species of this genus have been reported from Ceylon 
and South Australia, from Patagonia, the Falkland Islands, Argen- 
tina, Brazil, Venezuela, and from Vera Cruz, Mexico. A single 
species only has been found in the temperate regions of the northern 
hemisphere, having been described by Turner in 1892 from Cin- 
cinnati as Cypris herricki. Dr. Vavra now regards this as identical 
with C. speciosa Dana, described in 1838 from Rio de Janeiro. ‘The 
genus Notodromas also receives an addition from South America in 
N. patagonica. Two of the three species of this genus previously 
known belong to the South Australian region, and one is cosmopolitan 
in its distribution. Dr. Vavra’s paper thus affords further data for 
the oft-recurring discussion of the similarity of the southern fauna of 
the eastern and western hemisphere. CARK 
New Flagellata from the Rhine.’ — Eight new forms are de- 
scribed by Dr. Lauterborn from the Rhine and its adjacent waters. 
Of especial interest is his Bicosæca socialis, a free-swimming colony in 
which each zooid exhibits a well-defined but rudimentary collar about 
the single flagellum, a condition which suggests a possible origin for 
the Choanoflagellata. A colonial Chrysomonad, Hyalobryon ramosum, 
is sessile, differing in this respect from the closely allied Dinobryon, 
which is pelagic in habit. Hyalobryon is also peculiar in the method 
of attachment of the superposed loricæ, these being fastened by their 
basal tips to the outside of the supporting lorica. Lauterborn sug- 
gests the possibility that this form may be identical with Æpipyxis 
socialis, described by Dr. A. C. Stokes? from New Jersey. The 
absence in this latter description of any reference to the method of 
attachment of the loricæ and to the characteristic growth rings on 
their distal ends seemed to justify the establishment of a'new genus 
for the species from the Rhine. A new pelagic colonial form, C%ry- 
sospherella longispina, resembles Synura uvelia in the form of the 
colony and in the structure of the individual zooids, but differs from 
the latter in the fact that each zooid bears but a single flagellum, 
and in addition a pair of long silicious tubes which project consid- 
erably beyond the colony. They rise from pedestals shaped like 
wine-glasses, and resemble somewhat the spines of the heliozoan 
Acanthocystis. As floats they may assist in the pelagic habit. 
Co As K 
1 Lauterborn, R. Protozoén-Studien. IV. Theil. Flagellata aus dem Gebiete 
des Oberrheins. Hadilitationsschrift Univ. Heidelberg. 37 pp. 2 Taf. Ludwigs- 
hafen am Rhein. 1898. 
2 Proc. Amer. Phil. Soc., vol. xxvii (1890), p. 76. 
