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This area of molt then spreads cephalad and caudad.

A slight variation in the above process occurred in some specimens in which the lateral strips joined immediately cephalad of the tail instead of at the center of the dorsum.

The molt patch extends caudad toward the tail and cephalad toward the chin.

Amnion cavity: a tube-like insinking from the ventral plate of the embryo, extending cephalad.

Cephalad: toward the head, along the central line of the body.