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Further Studies on the Ovogenesis of Sagitta. 
By 
N. M. Stevens. 
(From the Biological Laboratory of Bryn Mawr College.) 
With plate 16. 
After the results of my work with Prof. Boverr on Sagitta 
(1903) were sent to the publisher, an attempt was made to obtain 
the material necessary to complete the study of the ovogenesis. 
Prof. F. M. MacFaruanp kindly offered to secure a new supply of 
Sagitta at Naples, and prepare it as was suggested by results already 
obtained. Only one specimen, however, threw any light on the 
doubtful points. 
In April of the present year, I obtained from Mr. Gro. M. Gray, 
Curator of the Marine Biological Laboratory, Woods Hole, Mass., 
several dozen of Sagitta elegans, which gave me the desired stages, 
— in fact, all stages in the ovogenesis up to the actual extrusion 
of the eggs from the oviduct. 
The one favorable specimen of Sagitta bipunctata from Naples 
contained six eggs which showed the first maturation spindle in 
equatorial stage; the eggs were in what appeared to be a temporary 
oviduct, formed between the sperm-duct and the germinal portion of 
the ovary (Pl. 16, Fig. 1). This rather surprising arrangement by 
which the germinal epithelium and the accessory cells of the larger 
16* 
