. Journal of morphology. oO O o^5^ O^ CO Figs. 1 to 3 Unsegmented eggs of Crepidula plana, C. convexa, and C. adunca,drawn to the same scale, to show relative sizes of eggs, germ nuclei, and cytoplas-mic and yolk areas. 170 EDAVIN G. CONKLIN with the larger eggs a considerable number of oiDgonia, or of fol-licle cells, fuse to make a single egg. In the very early stages ofthe oogonia, in C. convexa, there is no marked difference betweenthe germ cells and the follicle cells; later they differentiate and thefollicle cells become more numerous than the oogonia. Bothfollicle cells and oogonia are
. Journal of morphology. oO O o^5^ O^ CO Figs. 1 to 3 Unsegmented eggs of Crepidula plana, C. convexa, and C. adunca,drawn to the same scale, to show relative sizes of eggs, germ nuclei, and cytoplas-mic and yolk areas. 170 EDAVIN G. CONKLIN with the larger eggs a considerable number of oiDgonia, or of fol-licle cells, fuse to make a single egg. In the very early stages ofthe oogonia, in C. convexa, there is no marked difference betweenthe germ cells and the follicle cells; later they differentiate and thefollicle cells become more numerous than the oogonia. Bothfollicle cells and oogonia are sometimes imbedded in youngooc3^tes, ,or even in the oogonia, and in such cases the size of theoocytes is greater and their number fewer than in other species inwhich such a fusion has not been observed. TABLE 4Number, size and volume of eggs as compared with volume of adult female SPECIES C. plana C. fornicata. .C. convexa. .C. ..Fulgur carica NDMBER DIAMETER EGGS LAID EGG M ca. 9000 142 182 ca. 220
Size: 1251px × 1997px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1, booksubjectphysiology, bookyear1912
