140 



O. C. GLASEK. 



young female, often lacks either the upper or lateral flanges, or 

 both. 



The number of eggs in each capsule is much greater than has 

 been supposed, and has an important effect on development. By 

 actual count I found that one capsule contained 2,308 eggs. 

 The highest estimate which I remember to have seen in the lit- 



o 



erature is from 600 to 800. The ova, densely crowded with 

 pink, brown, or white yolk spherules, which are separated from 

 an unusually large and eccentrically placed germinal vesicle by 



FIG. I. Egg-cases of Fasciolaria tulipa (var. distant} one half natural size. 



a zone of clear cytoplasm, vary in diameter from .17 to .25 mm. 

 Even eggs of this size are minute enough to produce the same 

 optical effects that much smaller spheres do, for in making a 

 numerical estimate in a watch crystal one almost invariably sup- 

 poses fewer to be present than the dish actally contains. 



Of all the eggs in fresh capsules only a few are fertilized and 

 develop. The remainder with the germinal vesicle intact are in- 

 gested, usually within a week after deposition by the developing 

 embryos. After the eggs have been swallowed several days 

 their germinal vesicles fragment, their pellicles disappear, and 

 their yolk finally is digested. 



The fertilized eggs are so few in number and so difficult to find 



