. Bulletin - United States National Museum. Science. Fig. 592.—Argeia pugettensis. First incubatory plate from specimens found on: a, Necto- CRANGON CRESSA FROM OFF CaPE NewENHAM, ALASKA. X 9^^. 6, NeCTOCRANGON CRASSA FROM Alaska, x 9^. c, Crago nigromacul-^ta from San Diego Bay, California, x 9j. rf, Crago nigrkatda from off Cape Johnson, x 9j. stage. The outer pleopoda and uropoda are small, liut all developed. The first two inner pleopoda are present; the other three ma}^ or may not be present. When present they are usualU^ smaller than the first two, decreasing in size to the fifth pair, a
. Bulletin - United States National Museum. Science. Fig. 592.—Argeia pugettensis. First incubatory plate from specimens found on: a, Necto- CRANGON CRESSA FROM OFF CaPE NewENHAM, ALASKA. X 9^^. 6, NeCTOCRANGON CRASSA FROM Alaska, x 9^. c, Crago nigromacul-^ta from San Diego Bay, California, x 9j. rf, Crago nigrkatda from off Cape Johnson, x 9j. stage. The outer pleopoda and uropoda are small, liut all developed. The first two inner pleopoda are present; the other three ma}^ or may not be present. When present they are usualU^ smaller than the first two, decreasing in size to the fifth pair, and sometimes diiticult to discern. The marsupial plates are larger than in the preceding stage, ])ut not fully developed. The in- cul)ator3' pouch never carries eggs in either of these stages. The male is similar to the male of the adult female. Specimens of l)oth immature stages were found on the same species and genera of host as the adult females. A male in the crvptoniscan stage was found on one iuuuahire female (in first post-larval stage). Thoracic processes of adult fe- VIale.—In the adult female the thoracic processes ma}- be quite re- duced. In some specimens these processes are well developed, though never in all the specimens examined were they found as long as i n the very young female or as in the figure given hy Dana of the adult female. In other specimens these processes are very small, and yet in many they were not even present. Not only is this variation found in specimens taken from difi'erent species and genera of host, but it is also tru«^, of those found on the same species and geiuis of host. As a result of this observation on a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington :
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