. Fresh-water biology. Freshwater biology. THE WATER-MITES (HYDRACARINA) 869 46 (53) Genital area usually lying far forwards, at least between epp. IV, and the epimeral groups often separated by a considerable interval, no ancoral process on the maxillary shield. Subfamily Sperchoninae . 47 47 (52) Genital acetabula borne on a plate, no flaps present 48 48 (49) Acetabula numerous Limnesiopsis Piersig 1897.. 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 north
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. Fresh-water biology. Freshwater biology. THE WATER-MITES (HYDRACARINA) 869 46 (53) Genital area usually lying far forwards, at least between epp. IV, and the epimeral groups often separated by a considerable interval, no ancoral process on the maxillary shield. Subfamily Sperchoninae . 47 47 (52) Genital acetabula borne on a plate, no flaps present 48 48 (49) Acetabula numerous Limnesiopsis Piersig 1897.. 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 1895.. 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 work.. Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. , etc. ]