. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. la 1122. mz Fig. 7. Fig. 8. Fig. — Arenicola. Formation of cross by radial divisions. Fig. 8.—Arenicola. The terminal cells of the ventral arms of the "cross" show spindles which are distinctly spiral. of development — a precocious segregation —is found, are due, at least in some measure, to the fact that it affords the least possible physical obstacle to intercommunication between the component elements .-' For, if a tendency to condensation be present, the possession or acquisitio
. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. la 1122. mz Fig. 7. Fig. 8. Fig. — Arenicola. Formation of cross by radial divisions. Fig. 8.—Arenicola. The terminal cells of the ventral arms of the "cross" show spindles which are distinctly spiral. of development — a precocious segregation —is found, are due, at least in some measure, to the fact that it affords the least possible physical obstacle to intercommunication between the component elements .-' For, if a tendency to condensation be present, the possession or acquisition of the spiral form of cleavage must be of great advantage. Or it may be that the presence of this form of cleavage has led to that form of con- densation known as precocious segregation. Whichever alter- 1 In this and following figures of cleaving eggs the annelid cross (" rosette- series " of Conklin) and its descendants, and the somatic plate arising from 2d are enclosed by a heavy line; and the cells of the prototroch and paratroch, so far as formed in each case, are 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. ). Boston, Ginn & Co
Size: 1547px × 1615px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectbiology
