596 



ANATOMY OF VERTEBRATES. 



nation at the same season are simultaneously ripened. As soon 

 as the germ-cell is recognisable, it is contained in a delicate ovisac, 

 and speedily exhibits several nuclei, or macula, fig. 418, B, cj\ it is 



417 



413 



****? - - . 

 ** . V, ,.** 

 **.,*' 



O 9 q> e 

 O o 



d Q O 



le of the ovum in Osseous Pish, cccvm. Batracliian ovum in the ovisac, 



inch diam. cccvm. 



surrounded by a clear albuminous yolk fluid, vp, which gradually 

 becomes opake, and about which the yolk-granules accumulate, 

 among which is the opake or dark aggregate peculiar to Batrachia, 

 and called the yolk-nucleus, ib. vn. This body disappears as the 

 yolk-mass approaches its mature bulk, and acquires the larger 

 quadrilateral or quadrangular particles. -The smooth and well- 



