BREEDING HABITS. 207 



The condition in a female 90 mm. long containing 15 young, about 12 mm. 

 long, was as follows: there were n on the left side, one of which had an ovarian 

 lobe in its mouth, and several had the gill covers hooked over ovarial lobes, the rest 

 being free in the cavity (plate 15, fig. d). There were 4 on the right side, one of 

 which had the head turned to the rear, and one was so firmly attached to the 

 ovarian lobe by the gills that it was practically impossible to get it loose without 

 damage. 



One ovary of Stygicola containing 1 1 large eggs, at least one of which is free in 

 the ovary, is distended much more than the few eggs would warrant, being 16 mm. 

 long and 12 mm. wide. The outer tunic is quite thin. The eggs are nearly of 

 the same size and measure 848 /a in diameter. The general features of the ovary 

 of this species are given in plate 27, fig. a. The details of the structure are given 

 in another chapter by Lane. 



