. The Biological bulletin. Biology; Zoology; Marine biology. Fig. 4. Isolated filament anlagen from posterior tip of ctenidium of Mytilus. In all cases, anlage of outer gill at right. A and B from specimen of mm. length ; C from one of mm. ; D from one of mm.; E from another specimen of mm. Magnification 140. two youngest stages represented (Figs. 4, A ; 4, B) the tissue is distinctly embryonic with no differentiation ; but in the three older stages (Figs. 4, C; 4, D ; 4, E) the ciliated epithelium is clearly distinguishable, and is located on both sides of the anlage, show
. The Biological bulletin. Biology; Zoology; Marine biology. Fig. 4. Isolated filament anlagen from posterior tip of ctenidium of Mytilus. In all cases, anlage of outer gill at right. A and B from specimen of mm. length ; C from one of mm. ; D from one of mm.; E from another specimen of mm. Magnification 140. two youngest stages represented (Figs. 4, A ; 4, B) the tissue is distinctly embryonic with no differentiation ; but in the three older stages (Figs. 4, C; 4, D ; 4, E) the ciliated epithelium is clearly distinguishable, and is located on both sides of the anlage, show- ing the equivalence of the latter to both limbs of the flexed filament. Another difference between early and late filament formation is found in the relations of the upper end of the reflexed filament limb. In the earlier filaments, the reflexed limb, developed at the free end of the direct limb, is primarily free. In Mytilus it retains this freedom ;l but in many lamellibranchs the upper ends of reflexed filament limbs are secondarily fused with the 1 Even in Mytilus there is a fusion of the upper ends of the reflexed filament limbs with one another to form a somewhat definite border to the reflexed lamella of 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. ]
Size: 2110px × 1185px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectb, booksubjectzoology
