92 
measure ‘06 mm., and appear as oval bodies with a thin 
vitelline membrane. The cell contents are finely 
granular. The nucleus is a large oval body, with a sharp 
outline. A single rounded nucleolus is also present. 
After passing into the genital segment the cell contents 
increase in amount, causing a great enlargement of the 
egg, which finally passes out at the opening between the 
vulva and the lateral margin of the segment, already 
described. As the eggs pass out they are probably 
fertilised by the spermatozoa from the “ receptaculum 
seminis.” They are then enclosed in a thin chitinous 
tube, secreted by the cement gland, which gradually 
extends as more eggs are expelled. The ovisacs are often 
longer than the animal. The eggs in this tube are 
biscuit-shaped, measuring “36 mm. in diameter and 
‘11 mm. in thickness. They are arranged in a single 
column. When the animal is irritated the tubes are 
frequently detached. When the embryos hatch, the 
empty, ruptured tube is left, and remains attached to the 
animal for a time. After examining many specimens, 
the conclusion has been come to that additional eggs are 
not developed in the tubules of the ovary after the first 
lot have been expelled. Adult females in which the 
ovary is only an empty sac are not uncommon. 
Lire Hisrory. 
Lepeophthewus has no regular breeding season. Mature 
females with ovisacs may be found at all times. The 
state of development reached by the embryos carried by 
various females collected at the same time is frequently 
widely different. In some the germinal dise has just 
begun to segment, in others the larve are ready to hatch. 
The changes that take place in the developing embryo 
have not been worked out by the author. The period of 
