. Fresh-water biology. Freshwater biology. 738 FRESH-WATER BIOLOGY 247 (120) No eye; ocellus only Monospilus Sars 1861. Sole species Monospilus dispar Sars 1861. Form oval or round. Shell not cast in molting, as in Ilyocryptus. Valves nearly round with fine setae along ventral edge. Head very small, depressed, movable. Keel of labrum with about 4 scallops on ventral edge. Post-abdomen broad, short, with about 5-7 marginal denticles and numerous clusters of fine hairs. Eye lack- ing; ocellus large. Antennules short, not reaching apex of rostrum. $ with hook on first foot; post-abdomen tapering,
. Fresh-water biology. Freshwater biology. 738 FRESH-WATER BIOLOGY 247 (120) No eye; ocellus only Monospilus Sars 1861. Sole species Monospilus dispar Sars 1861. Form oval or round. Shell not cast in molting, as in Ilyocryptus. Valves nearly round with fine setae along ventral edge. Head very small, depressed, movable. Keel of labrum with about 4 scallops on ventral edge. Post-abdomen broad, short, with about 5-7 marginal denticles and numerous clusters of fine hairs. Eye lack- ing; ocellus large. Antennules short, not reaching apex of rostrum. $ with hook on first foot; post-abdomen tapering, triangular, somewhat resembling that of Grap- toleberis. Color brown-yellow. Length, 91 ca. mm.; $, ca. mm. New England, Wisconsin, Minnesota; rare. Fig. 1168. Monospilus MM. 248 (i) Body and feet not covered by shell. Feet subcylindrical or flattened, jointed, prehensile. . Section B. Gymnomera . 249 No fornices. Rami of antennae 3- to 4-joiuted. Feet, 4 to 6 pairs, jointed, prehensile. 249 (250) Four pairs of feet, stout, compressed, with claw-Kke spines and branchial appendages. Tribe I. Onychopoda. Sole family. Polyphemidae Baird. Body very short. Shell converted into large globular brood-sac. Caudal process long, slender, with 2 long caudal stylets or setae. Rami of antennae with 3 and 4 joints. Eye very large; no ocellus. Labrum large. Two small hepatic ceca. One genus Po/y^/jewMj O. F. Miiller 1785. Sole species Polyphemus pediculus (Linne) 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, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
