. Fresh-water biology. Freshwater biology. 62 (63) Furca normal, with two spines and two setae (Fig. 1278rf). Subgenus Cypris . 64 63 (62) Furca abnormal, the terminal seta missing (Fig. 1280c). Paracypris New Subgenus . 73 64 (65) Both spines of first maxillary process smooth 66 65 (64) Both spines of first maxillary process toothed (Fig. 1270 e). . 68 66 (67) Shell bluish black, with two yellowish areas in region of eye-spot (Fig. 1275 a). . Cypris {Cypris) virens Jurine 1820. Length to mm., height to mm. Shell covered with short hairs, and left valve slightly overlapping
. Fresh-water biology. Freshwater biology. 62 (63) Furca normal, with two spines and two setae (Fig. 1278rf). Subgenus Cypris . 64 63 (62) Furca abnormal, the terminal seta missing (Fig. 1280c). Paracypris New Subgenus . 73 64 (65) Both spines of first maxillary process smooth 66 65 (64) Both spines of first maxillary process toothed (Fig. 1270 e). . 68 66 (67) Shell bluish black, with two yellowish areas in region of eye-spot (Fig. 1275 a). . Cypris {Cypris) virens Jurine 1820. Length to mm., height to mm. Shell covered with short hairs, and left valve slightly overlapping the right. Ventral edge flanged anteriorly. Natatory setae reach to tips of terminal claws. Dark to yellowish green. Furca weakly S-shaped to straight and from eighteen to twenty times as long as average width, and its dorsal margin smooth. Very variable. Weedy ponds; April to July. Massachusetts, Mexico, Ohio, 67 (66) 68 (69) 69 (68) Fig. 1275. Cypris {Cypris) virens. (o) Side view, X 18; (6) Dorsal view; W Furca. Shell bright, deep green, smooth, with minute punctures. Cypris {Cypris) altissima Chambers 1877. Length mm., height mm. Furca sinuous, its two terminal claws nearly same length. Pond fed by melt- ing snow, Mt. Elbert, Colorado. Altitude 12,000 feet. Fig. 1276. Cypris (Cypris) altissima. Furca. Terminal three segments of first leg longer than two-thirds of its terminal claw (Fig. 1277 b) 70 Terminal three segments of first leg shorter than two-thirds of its terminal claw 72. 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
