. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 26o E. A. ANDREWS. Both bear a fringe of setae along the external edge. This long line of setae seems to represent what is found upon the edges of the common pleopods and may be regarded as a mark of little specialization or of retention of primitive characters, since in Cambarus it is generally specialized as a local group oj setae, or at most in C. Clarkii, as a less simple line. The main features of the endopodite are, however, a shallow groove and a very stout ridge along the posterior face, external to the groove. This
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 26o E. A. ANDREWS. Both bear a fringe of setae along the external edge. This long line of setae seems to represent what is found upon the edges of the common pleopods and may be regarded as a mark of little specialization or of retention of primitive characters, since in Cambarus it is generally specialized as a local group oj setae, or at most in C. Clarkii, as a less simple line. The main features of the endopodite are, however, a shallow groove and a very stout ridge along the posterior face, external to the groove. This ridge ends distally as a swelling that is part of the specialized tip of the organ. More enlarged, Fig. 4,. FIG. 4. the tip shows the rounded head in which the ridge ends, the groove to the left of it and a depression to the right. The actual ending of the organ is a sort of complex edge, flattened from before back. On the median side of the groove are two horny points, the shorter posterior, the longer anterior. The posterior is com- parable to the large " spatula" and the anterior to the large " canula " of Cambarus Montezumce. External to the groove is a short, blunt anterior point, comparable to the " ligula " of C. Monte-zumce and a long thin knife edge that is a continuation 01 the rounded head of the ridge. The organ appears fitted to open a slit into which sperm might flow from the groove. In C. Japonicus the two first stylets lie side by side with diver-. 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 Labo
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
