Abstract
1. Sperm surface antigens are defined as those antigens which are detected by sperm agglutinating action of antisera. 2. Interspecific sperm agglutination tests show one or more sperm surface antigens common to all of the five echinoids tested except for a single combination. 3. The Arbacia sperm surface possesses a minimum of three antigens or antigenic complexes in common with other species. One of these is shared with Lytechinus sperm, a second with both Lytechinus and Echinarachnius and a third is not present on sperm of these species. 4. Arbacia sperm extracts prepared by freeze-thawing, Mickle disintegration or pH 3 treatment all contain "soluble" antigens in common with the sperm surface. The Arbacia sperm surface also possesses "insoluble" antigens which do not appear in the above extracts. 5. The "soluble sperm surface" antigen(s) in extracts is neutralized by fertilizin from Arbacia eggs. 6. It is present on the sperm tail surface and possibly to some extent on the sperm head. 7. The insoluble sperm surface antigen(s) is confined to the sperm head.
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