. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DIMORPHISM IN SPERMATOZOA OF ANASA. 291 sheath is two to three times as thick as the chromatic rod. It extends 2n to 3/z anterior to the anterior end of the chromatic rod, and is continuous posteriorly with the sheath of the axial filament. Considerable observation has shown that the fre- quency curve for chromatic rod length does not differ from the Length in M. 33-48 34-56 35-64 FIG. 2. Bimodal curve of variability of chromatic-rod length for ir. Great
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DIMORPHISM IN SPERMATOZOA OF ANASA. 291 sheath is two to three times as thick as the chromatic rod. It extends 2n to 3/z anterior to the anterior end of the chromatic rod, and is continuous posteriorly with the sheath of the axial filament. Considerable observation has shown that the fre- quency curve for chromatic rod length does not differ from the Length in M. 33-48 34-56 35-64 FIG. 2. Bimodal curve of variability of chromatic-rod length for ir. Greater number of spermatozoa grouped around the upper mode,[M". 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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