Euphausiiclæ. 11 



sumed that these ova must have bean fecundated at 

 the place where they occurred, and immediately before being 

 found. 



II. 



Propagating-spheres of Euphausiidæ. 



(Oosphères and Spermatospheres). 



As mentioned above, a closer examination of the hya- 

 line spheres which are generally regarded as the eggs of 

 the Euphausiidæ, has led me to believe, that they in fact 

 comprise 2 very different kinds, and that, strictly speaking, 

 neither of these can properly be termed eggs. I have there- 

 fore thought it advisable to propose a new term for these 

 bodies, viz., propagating-spheres, and the 2 different kinds 

 of these spheres are here described as oosphères and sperma- 

 tospheres. The oosphères are by far the more numerous, and 

 it is very probable that only this kind of spheres have 

 hitherto been observed. In outward appearance (see PI. 1, 

 figs. 1, 2) they at first sight strongly recall certain pelagic 

 fish-eggs in their early stages of development, such as those 

 of Ctenolabrus rupestris, and are also of about the same size, 

 measuring in diameter from 0.70 to 0.80 mm 1 ). Both the 

 above-named fish-eggs and the oosphères appear, when in 

 a fresh state, like perfectly hyaline globes, containing in 

 their interior, close to the lower pole, a much smaller and 



*) Messrs. Brook and Hoyle have observed oosphères of much 

 smaller size, viz., of only 0.50 mm. in diameter, and probably belonging 

 to a species of the genus Thysonoessa. 



