Further studies on the Gametogenesis of Pandarus 
sinuatus, Say. 
By 
J. F. Mc Clendon. 
(From the Zoological Laboratory of the University of Missouri and the Histo- 
logical Laboratory of Cornell University Medical College, New York City.) 
With 1 figure in the text and plate XVII. 
In two former papers^) I considered certain phases of this subject, 
but owing to the increasing interest in the part played by the chrorao- 
somes in heredity a more detailed study seemed advisable. The present 
paper considers especially the individuality of the chromosomes during 
the gametogenesis. 
Material and Methods. 
Dming the Summers of 1904 — 6 and 1909 I collected parasitic cope- 
pods at Woods Hole. The most favorable species for the study of the 
gametogenesis seemed to be Orihagoriscicola muricata Kröyer^), which 
occurs on the gills of the moon fish, Selene vomer, but more abundantly 
on the skin of the sun fish, Mola mola. The only specimens of this species 
which I was able to obtain were fixed in toto, so that a more abundant 
species, Pandarus sinuatus, which occurs on the skin of the smooth dog 
fish and the sand shark, had to be used. The integument of the cope- 
pods was partly removed or the sexual Organs dissected out to insure 
rapid penetration of the fixing fluid, Flemwing’s. Thin sections were 
made and stained in iron haematoxylin. 
1) Biological Bulletin, 1906, XII, p. 37 and 1907, XIII, p. 114. 
2) See Proc. National. Museum, XXXIII, p. 473, for description and figure. 
