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 maculae, fig. 418, B,y: it is 



417 





D vtftr C 



°> o © o 9^®l^s^ :.v.v. v.v.v.w.v.v. 

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9 °*^ r ^iW< :••.•:•'.•'.•:•-'■■.•'•<•:•'•■'••••*••■.••.••/ 

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413 



Uicropyle of the uvumin Osseous Fish, cccviu. Batvachian ovum in the ovisac, yigthincb diaia. cccvill. 



surrounded by a clear albuminous yolk fluid, v p, 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- 



