. Fresh-water biology. Freshwater biology. 8io FRESH-WATER BIOLOGY 37 (26) Shell with weak tubercles, knobs, and furrows. Natatory setae reaching scarcely to tips of terminal claws. Ilyocypris bradyi Sars 1890. Length about as /. gibba. Height of female to mm., breadth to mm. Male slightly larger. Scarcely free swimming, but creeps or burrows. Shell weakly tuberculate and not furrowed posterodorsally. Habitat and occurrence as /. gibba. Furca strong curved, and much broad- ened at base. About ten times as long as width in middle. Dorsal seta plu- mose and bent near tip. Dista
. Fresh-water biology. Freshwater biology. 8io FRESH-WATER BIOLOGY 37 (26) Shell with weak tubercles, knobs, and furrows. Natatory setae reaching scarcely to tips of terminal claws. Ilyocypris bradyi Sars 1890. Length about as /. gibba. Height of female to mm., breadth to mm. Male slightly larger. Scarcely free swimming, but creeps or burrows. Shell weakly tuberculate and not furrowed posterodorsally. Habitat and occurrence as /. gibba. Furca strong curved, and much broad- ened at base. About ten times as long as width in middle. Dorsal seta plu- mose and bent near tip. Distal half of dorsal part of furca ciliate. These two species are quite variable, thus causing much coiifusion in diagnosis. Both species are also found in Britain and Germany. Fig. 1258. Ilyocypris bradyi. (o) Furca, X aoo; (b) End of second leg, X 150; (c) Dorsal view, X as; (.d) Side view, X 28 (29) Natatory setae of the second antenna shortened, no swimmers. Second leg with a beak-like end segment and a claw (Fig. 1268 6) Subfamily Herpetocypridinae . 30 ?9 (28) Natatory setae of the second antenna long, reaching at least to tips of terminal claws. Second leg as above. Subfamily Cypridinae . 42 30(31) Furca abnormal, with three claws, — the usual dorsal seta being replaced by a claw. Shell faintly longitudinally striated (Fig. 1259) Ilyodromus Sars 1894. Only one species known in America. Ilyodromus pectinatus Sharpe 1908. Length to mm. Shell with reticulate patterns anteriorly and posteriorly. • Posterior edge of furca decidedly pectinate. The only known spedes of the genus with a pectinate furca. In ponds and slowly flowing streams, with Typha, Iris, Chara, etc. South Carolina. Fig. IJS9. Ilyodromus pectinatus. (a) Side view, X 4Si (i) Furca, X 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 origi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
