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Catrad (Site not responding. Last check: 2007-11-03) |
 | | After this there was nothing more to be done but to marry the two couples as fast as possible. |
 | | During the embryonic condition of all vertebrates, the centre of the partition is occupied by an elongated, cellular, cylindroidal massthe notochord, or chorda dorsalis. |
 | | And this structure persists throughout life in some Vertebrata ; but, in most it is more or less completely replaced by a jointed, partly fibrous and cartilaginous, and partly bony, vertebral column. |
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