. The Biological bulletin. Biology; Zoology; Marine biology. 198 BENJAMIN M. KAGAN but that the sperm in some way hastens the early stages of development of the egg. The blastodisc in uninseminated eggs occasionally gives the appear-. PLATE I Fig. 1. A freshly stripped unfertilized egg. Note platelets and large oil drops. Fig. 2. The streaming of the platelets toward a small blastodisc in an un- fertilized egg one hour after stripping. Fig. 3. The same egg as in Fig. 2, but fifteen minutes later. The blastodisc has become larger, and the platelets which are still present surround the blastodis
. The Biological bulletin. Biology; Zoology; Marine biology. 198 BENJAMIN M. KAGAN but that the sperm in some way hastens the early stages of development of the egg. The blastodisc in uninseminated eggs occasionally gives the appear-. PLATE I Fig. 1. A freshly stripped unfertilized egg. Note platelets and large oil drops. Fig. 2. The streaming of the platelets toward a small blastodisc in an un- fertilized egg one hour after stripping. Fig. 3. The same egg as in Fig. 2, but fifteen minutes later. The blastodisc has become larger, and the platelets which are still present surround the blastodisc. Fig. 4. A normal blastodisc as it appears in a fertilized egg. Most blastodiscs which develop upon unfertilized eggs in sea water present the same appearance. Fig. 5. Semi-profile view of the blastodisc in an unfertilized egg in sea water. The appearance is identical with the same stage in a fertilized egg. Figs. 6 and 7. Apparent attempts at cleavage among eggs which have re- mained in sea water for over three hours. None have ever been seen to cleave completely. Figs. 8 and 9. Normal two and four-cell stages respectively. ance of aberrant cleavages. (See Figs. 6 and 7, PL I.) These may be artefacts due to osmotic or to other effects or may be attempts at cleavage which fail because of inadequate stimulus. They resemble. 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. ]
Size: 1591px × 1570px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectb, booksubjectzoology
