. Fresh-water biology. Freshwater biology. Chiefly a marine group; the only genus known from the fresh water of North America, enters with its hosts, being found parasitic upon the gills and in the gill cav- ities of Decapods of the genera Palaemo- netes and Palaemon. Three species are known, and are found along the Atlantic coast from New Hamsphire to Florida, and in the Mississippi River in Louisiana. Fig. 1306. Probopyrus pandalicola Packard. A, Male; X 30. B, Female; X 3. (After Richard- son.) 11(2) 12 (25) 13 (14) Body compressed. Pleopods divided into two sets, the first three pairs with
. Fresh-water biology. Freshwater biology. Chiefly a marine group; the only genus known from the fresh water of North America, enters with its hosts, being found parasitic upon the gills and in the gill cav- ities of Decapods of the genera Palaemo- netes and Palaemon. Three species are known, and are found along the Atlantic coast from New Hamsphire to Florida, and in the Mississippi River in Louisiana. Fig. 1306. Probopyrus pandalicola Packard. A, Male; X 30. B, Female; X 3. (After Richard- son.) 11(2) 12 (25) 13 (14) Body compressed. Pleopods divided into two sets, the first three pairs with multiarticulate rami, the last two pairs generally similar to the uropods, with unsegmented rami. No sexual modification of pleopods in the male. Order Amphipoda 12 Antennulae with secondary flageUum. Telson cleft or entire. 13 Fifth peraeopods shorter than the preceding. Second maxiUipeds smaller than the first. Uropods with two nearly equal rami. Family Lysianassidae. Only one fresh-water genus in North America. Pontoporeia Kroyer. This family is chiefly marine; two spe- cies Hve in rather deep water of the lakes Superior and Michigan. These species are closely allied to certain European fresh-water forms, and probably immi- grated into the lakes at the dose of the glacial Pontoporeia hoyi Smith. (After Smith.) X4. 14 (13) Fifth peraeopods longer than the preceding. Second maxiUipeds generally larger than the first. Uropods with two unequal rami or without rami. Family Gammaridae . 15 A family represented both in the sea and in fresh water, and containing a great number of forms. 15 (20) Telson cleft. Uropods biramous 16 16 (19) Inner ramus of uropods rudimentary. Telson cleft not more than three-fourths the distance to the base 17. 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 Ward, He
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
