. Fresh-water biology. Freshwater biology. A large hydrachnid, about 2 mm. in length, with the surface of the body beset with sharp points. One species, L. anomala (Koenike), described from Canada, and generally distributed in northern lakes but no- where common. Fig. 1343. Limnesiopsis anomala iKoenike). Epimeral field and genital area, male. X 25. Outer side, palpus, male. X 49. (After Koenike.) 49 (48) Acetabula few, large 50 50 (51) Leg IV with terminal claws, no swimming-hairs. Tyrrellia Koenike Body almost circular, papillated with one or two dorsal chitinous plates; mouth-opening
. Fresh-water biology. Freshwater biology. A large hydrachnid, about 2 mm. in length, with the surface of the body beset with sharp points. One species, L. anomala (Koenike), described from Canada, and generally distributed in northern lakes but no- where common. Fig. 1343. Limnesiopsis anomala iKoenike). Epimeral field and genital area, male. X 25. Outer side, palpus, male. X 49. (After Koenike.) 49 (48) Acetabula few, large 50 50 (51) Leg IV with terminal claws, no swimming-hairs. Tyrrellia Koenike Body almost circular, papillated with one or two dorsal chitinous plates; mouth-opening in the middle of a disk-like surface at the anterior end of the capitulum, resembling the condition seen in the Hydryphantidae; a sluggish, dark-brown mite of medium size averaging mm. in length, known from Canada and found abundantly some years since at Reed's lake, near Grand Rapids, Michigan, where it was picked up singly with the pipette in the debris at the margin of the water in close prox- imity to a swampy portion of the lake shore. Very rare in Birge net hauls at the same place. Two species taken, one apparently the same as T. circu- laris Koenike, previously described. Fig. 1344. Tyrrellia circularis Koeaike. Ventral surface, female. X 26. Inner side, palpus, female. X 49. (Modified from Koenike.). 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
