. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ONTOGENY OF THE ANNULUS VENTRALIS. E. A. ANDREWS. Ill crayfish of the genus Cambarns there is a sperm receptacle in the female which has been known as the Annuhts ventralis and made use of as a specific character in systematic works. Nothing has been known of its mode of development beyond the brief mention by Mary Steele L who figured the external views of the annulus in specimens of C. gracilis, 20, 22, , 30, 35, 36, 50 and 60 mm. in length. Of these the latter four were probably adults and the former four immature you
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ONTOGENY OF THE ANNULUS VENTRALIS. E. A. ANDREWS. Ill crayfish of the genus Cambarns there is a sperm receptacle in the female which has been known as the Annuhts ventralis and made use of as a specific character in systematic works. Nothing has been known of its mode of development beyond the brief mention by Mary Steele L who figured the external views of the annulus in specimens of C. gracilis, 20, 22, , 30, 35, 36, 50 and 60 mm. in length. Of these the latter four were probably adults and the former four immature young. These figures show an increasing complexity of external sculpturing and an increase in relative longitudinal diameter; however, as they were made incidentally and without reference to the use or internal structure of the organ they are necessarily insufficient. While the annulus is a necessary reproductive organ in Cam-. KlG. I. barus it is also a new organ in the history of crayfish since it is found only in the most specialized form, Cambarns. It seemed, therefore, of interest to find out just how and when the organ develops in the ontogeny of Cambarns. The following account of the origin and growth of the annulus refers almost exclusively to Cambarns affinis reared in the labo- l(J>iii'. of Cin. Bulletin, X., 1902. 122. 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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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
