Oceanographically speaking, the Guadalupe Island group off the coast of Baja California is one of the most fascinating treasure-hunting grounds in the world, but no group of pirates ever presented as bizarre an appearance as the expedition reported here by John O'Reilly. There were skin-divers who flung themselves into the sea with reckless eagerness; there was Dr. Werner P. Hueschele, veterinarian of the San Diego Zoo, who stood, with a knife like a cutlass, on deck carving up an elephant seal to preserve its skeleton for the San Diego Museum; there was Dr. Reid V. Moran, the botanist, whose weapon was a spearlike tree pruner. Dr. George E. Lindsay, the museum's president, a mighty man of 285 pounds, scaled cliffs like a native billy goat. Joseph W. Sefton Jr., ex-player in the first Rose Bowl game, was now delicately hunting flies. And, as captain of the whole crew, Professor Carl L. Hubbs (above) was a scientific slave driver who by day usually roosted in the crow's nest or balanced in the bows of the ship's boat collecting specimens by hand and by night gloated, like a true pirate skipper, over the treasures found, some of which are shown on opposite page.