Travel times from the 1958 series of nuclear explosions near Bikini and Eniwetok islands to Australian seismic stations were studied. For stations at distances between 25 ø and 63 ø the mean residual for P from the Jeffreys-Bullen times for a surface focus was --1.6 __+ 0.7 sec, agreeing with travel-time determinations to other continents. Times to Rabaul (19 ø and 21 ø) strongly suggest a sharp bend in the P curve near 17 ø, corresponding to the '20 ø discontinuity.' There is also a possible bend near 25 ø to 26 ø, but this would be less marked. 1115 1116 DOYLE AND WEBB
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