. Fresh-water biology. Freshwater biology. Fig. 878, B. Fig. 878. A, Notommala aurila Ehr. X200. (After Weber.) B, corona. (After Wesen- Fig. 878. 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