. Zoology : for students and general readers . Zoology. PHTLtOGAMDA. 511 The series of Amphipods begins with Cyamus ceti (Linn.), the whale-louse, passes into Gaprella, with its linear body and spider-like legs, to Hyperla, which lives as a mess-mate of the jelly-fish, Cyanea, and culminates in the water-flea {Gammarus ornatus Edwards) and sand-flea (OrcAes^i'a agilis Smith), abundant and leaping in all directions from under dried sea-weed at high-water mark. Fig. 3G4 represents Gammarus robustus Smith, a fresh- water form common in the western Fig. 264.—Gammarus 7Vbv^iu8 Smith.
. Zoology : for students and general readers . Zoology. PHTLtOGAMDA. 511 The series of Amphipods begins with Cyamus ceti (Linn.), the whale-louse, passes into Gaprella, with its linear body and spider-like legs, to Hyperla, which lives as a mess-mate of the jelly-fish, Cyanea, and culminates in the water-flea {Gammarus ornatus Edwards) and sand-flea (OrcAes^i'a agilis Smith), abundant and leaping in all directions from under dried sea-weed at high-water mark. Fig. 3G4 represents Gammarus robustus Smith, a fresh- water form common in the western Fig. 264.—Gammarus 7Vbv^iu8 Smith. Utah. Enlarged.—After Smith. Order 5. Pliyllocarida.—This name is proposed for a group of Crustacea, the forerunner of the Decapoda and hitherto regarded as simply a family {Nehaliadce), in which there is an interesting combination of Copepod, Phyllopod, and Decapod characters, with others quite peculiar to them- selves. The type is an instance of a generalized one, and is very ancient, having been ushered in during the earliest Si- lurian period, when there were (for Crustacea) gigantic forms {Dithyrocaris was over one foot in length) compared with those living at the present day. The order connects the Decapods with the Phyllopods and lower orders. The mod- ern Nebalia is small, about a centimetre (.40-50 inch) in length, with the body compressed, four of the abdominal segments projecting beyond the carapace, the last abdominal segment bearing two large spines. There is a large rostrum overhanging the head ; stalked eyes, and two pairs of anten- nae, the second pair nearly as long as the body and many- jointed. The mandibles are succeeded by two pairs of max-. 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York : Henry Holt
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
