Marshall—A Parasitic Ostracod. 
135 
of appendages, and near them, two long setae which finally dis¬ 
appear. Clans in hist description of the metamorphosis of Cy- 
pris figures the first larval, nauplius, stage as being without a 
fully developed mandible. In all the earliest stage's of Ento - 
cythere, PI. XI, fig. 7, I found the first three pairs of append¬ 
ages similar, execpt in size, to the same appendages of the ma¬ 
ture individual. The pair of appendages on the body, the pro- 
legs., disappear but I am unable to say whether they disappear 
entirely or become changed into' the: first pair of permanent legs. 
Their position on the body is not so far forward as that of the 
first pair of legs. 
Zoological Laboratory, 
University of Wisconsin, 
Madison, January 15, 1903. 
BIBLIOGRAPHY. 
1. Beady and Hoe man —A monograph of the marine and 
freshwater Ostracods. Royal Dublin Society, 1889- 
1896. 
2. BroniPs—T hier Reich, Y Band, A. Gerstacker, Crustacea. 
3. C. Claus —Beitrage zur Kenntniss der Siisswasser-Ostra- 
cod. Arbeiten aus demj zoolog. Institut zu Wien. 
1892-1895. 
4. C. Claus —Das Medianange der Crustaceen. Ibid. Bd. 
IX-1891. 
5. E. Daday —Uber die feinere Struktur der quergestreiften 
Muskelfasem der Ostracod. Mathembnaturw. Bericht 
aus ITngarn. Bd. XII. 
6. S. Fischer —Beitrag zur Iventniss der Ostracoden. Ab- 
handl der bayer. Akademie d. W. Bd. YII. 1855. 
7. A. Kaufmann —Beitrage zur Kentniss der Cytheriden. 
Recueil Zool. Suisse. Bd. III. 
8. G. W. Mueller— Duetschlands Susswasser-Ostracoden. 
Zoologica. Bd. XII. 
