The new version has more illustrations, including Nomarski views of key features we use in staging. The text is expanded, including a glossary, and the text has profited from the comments of reviewers for the journal, as well as from Monte and other colleagues. I sincerely hope that the new publication will not stifle the growth and development of the series as an evolving tool, and that the new version will soon be out of date. Face views are shown during cleavage and blastula stages. After shield stage, the views are of the embryo's left side, but before the shield arises one cannot always reliably ascertain which side is which.
Pigmentation is omitted.