. Fresh-water biology. Freshwater biology. THE OSTRACODA 8l) 6i (60) Shell reticulated, thin, the spermaries showing through. Equivalve. Cypris {Cyprinotus) crena Turner 1893. Shell equivalve from above, wedge-shaped anteriorly. Hinge Une sinuate. Length to mm., height to mm., width to mm. Yellowish green. Maxil- lary spines smooth. Fourth segment o£ first leg not with four extra short spines. Furca curved, about eighteen times as long as wide. Males common. Abundant in small weedy ponds and canal basins. Ohio. Fig. 1274. Cypris (Cyprinotus) crena. (a) Side view,
. Fresh-water biology. Freshwater biology. THE OSTRACODA 8l) 6i (60) Shell reticulated, thin, the spermaries showing through. Equivalve. Cypris {Cyprinotus) crena Turner 1893. Shell equivalve from above, wedge-shaped anteriorly. Hinge Une sinuate. Length to mm., height to mm., width to mm. Yellowish green. Maxil- lary spines smooth. Fourth segment o£ first leg not with four extra short spines. Furca curved, about eighteen times as long as wide. Males common. Abundant in small weedy ponds and canal basins. Ohio. Fig. 1274. Cypris (Cyprinotus) crena. (a) Side view, X is: (&) Furca of 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, 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
