. Bulletin - New York State Museum. divided into 25 families and ofthese 7 have common representatives in New York city. Family ORctiESTiD^^E: Antennulae much shorter than antennae and devoid of a secondaryflagellum. Mandibles without a palp. Gnathopods variable, thesecond pair being generally different in the two sexes. First twopairs of uropoda strong, last pair smaller and one branched. A very distinct family, the members of which have become more cr less adapted to terrestrial life. They may be said to be the beach fleas. Allorchestes dentata (Smith) Hyalella dentata Smith, S. I. U. S. Fis
. Bulletin - New York State Museum. divided into 25 families and ofthese 7 have common representatives in New York city. Family ORctiESTiD^^E: Antennulae much shorter than antennae and devoid of a secondaryflagellum. Mandibles without a palp. Gnathopods variable, thesecond pair being generally different in the two sexes. First twopairs of uropoda strong, last pair smaller and one branched. A very distinct family, the members of which have become more cr less adapted to terrestrial life. They may be said to be the beach fleas. Allorchestes dentata (Smith) Hyalella dentata Smith, S. I. U. S. Fish Com. Rept. , , A fresh-water form in which the first and second abdominal seg-ments are produced dorsally into spines. Much the smaller of the two fresh-water Amphipods found withinthe city. It also differs from Gammarus fasciatus, the HIGHER CRUSTACEA C)E NEW YORK CllV 153 other form, in the lack of a secondary flagelhun to the antennulaeand in the gnathopoda. The first pair of these are small and sub-. Fig, ig Allorchestesdentata (After Smith) . chelate in both sexes, and the second are small in the female andlarge in the male. Length mm. Occurs in the fresh-water ponds and stagnant pools throughoutthe city. Allorchestes littoralis Stimpson Allorchestes littoralis Stimpson, W. The Marine Invertebrataof Grand IManan. Smithsonian Contributions to Knowledge, 6. Wash. littoralis Verrill. /. c. 1874. P-556.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
