characteristic Y-shape. Whole specimens are necessary to confirm the identification. Type HA can be differentiated from the 6 thirdstage larval types belonging to the genus Terranova that have been adequately described by the relative lengths of the ventriculus and intestinal cecum. Four larval types, Type B of Koyama et al. (1969, Jap. J. Parasit. 18: 466-487) from Japan, Type I of Cannon (1977, Int. J. Parasit. 7: 233-243) from Queensland, type HB of Deardorff et al. (1982, loc. cit.) from the Hawaiian Islands, and T. secundum (as Porrocaecum s.) of Chandler (1935, Proc. U.S. Natn. Mus. 83: 123157) from Galveston Bay, Texas, have been described as possessing an intestinal cecum the same length as, or slightly longer than, the ventriculus. The 2 other larval types, Type II of Cannon (loc. cit.) and T. trichiuri (as Porrocaecum t.) of Chandler (loc. cit.) and Lent and Teixeira de Freitas (1948, Mems Inst. Oswaldo Cruz 46: 271), were described as having a cecum about twice as long as the ventriculus. Therefore, by possessing a cecum that is much shorter than the ventriculus, type HA larvae may be differentiated from these other types. We are grateful for the technical assistance of Robert A. Rychlinski in our laboratory and express our appreciation to the staff and management of Fishland Market, Ltd. and U. Okada and Co. for their cooperation during this study. This study was supported by Contract No. 22380-2295 from the Food and Drug Administration. . cit.) and T. trichiuri (as Porrocaecum t.) of
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Ozaki et al. (1984) studied this question.