. The Biological bulletin. Biology; Zoology; Marine biology. THE ANNULUS OF A MEXICAN CRAYFISH. 131 In both cases the first loop of the suture showed the thin plate of wax-like material represented in Fig. 10 as the darkened mass along the first curve of the suture. This wax also projected on the lateral face as the "sperm plug" so much more conspicuous in C. ajftnis. Now the oozing out of such a film of wax and the extension of the sperm from the suture over the annulus is what. Fig. 10. was made out, with difficulty, in the specialized annulus of C. affinis when mechanical pressure
. The Biological bulletin. Biology; Zoology; Marine biology. THE ANNULUS OF A MEXICAN CRAYFISH. 131 In both cases the first loop of the suture showed the thin plate of wax-like material represented in Fig. 10 as the darkened mass along the first curve of the suture. This wax also projected on the lateral face as the "sperm plug" so much more conspicuous in C. ajftnis. Now the oozing out of such a film of wax and the extension of the sperm from the suture over the annulus is what. Fig. 10. was made out, with difficulty, in the specialized annulus of C. affinis when mechanical pressure was exerted upon the annulus by forcing the hard sternum of the last thoracic somite against the annulus. In these C. montezumcz the sperm may have been forced out of the pocket by the shrinkage due to the heat with which they were probably killed, or the issuance of sperm may have been a normally produced act in females about to lay and in that case the efficiency of the spine upon the sternum of the fifth legs (Fig. 1) as a means of squeezing the annulus against the sterna in front of it, seems to support the view that it is such spon- taneous pressure on the part of the female that liberates the sperm at the right time to meet the 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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