This historic book may have numerous typos and missing text.
Purchasers can usually download a free scanned copy of the original
book (without typos) from the publisher. Not indexed. Not
illustrated. 1904 edition. Excerpt: ...the egg, so that each no
longer lies directly above the cell from which it arose (fig. 71).
This rotation, which affects nearly all the cleavages of the first
day, is characteristic of the "spiral ' type of cleavage fouud in
Nereis, and other Polychseta. These four upper cells form the first
quartette of ectomeres. From the four lower cells (I A, IB, IC, ID)
a second (fig. 72) and a third set of four (2a, 2b, 2c, 2d, and 3a,
3b, 3c, 3d) are successively development given in the following
account were made on various batches of eggs and larvse and
extended from this date until May 19th. when the last of the
larva5. died. I beg to express my sincere thanks to Professor Dohm
for his generosity in placing a Table and the resources of his
Station at my disposal, and to the Government Grant Committee of
the Royal Society for a grant towards the expenses of this and
other work dono in Naples. f I have used Dr. Child's nomenclature
of the cells, which is based on that proposed by Wilson in his
classical memoir on "The Cell. Lineage of Nereis," Journal of
Morphology, Vol. VI. J The early development of A. claparedii
appears to be very similar to that of A. cristata, which has been
studied in great detail by Dr. C. M. Child (see Archiv fiir
Entwickelungs-meehanik der Organismen, Band IX., Heft i, May 22nd,
1900). See also E. B. Wilson, Studies from the Biological
Laboratory, Johns Hopkins University, Baltimore, Vol. II., 1883,
pp. 271-299. a 03 2'a Fig. Fig. 69. 70. Fig. Fig. 72 In Fig. 73 all
the endo. 71. 2.B, 2C, and derm cells except 4c 2D, are not have
again divided, seen in the and the mesoblast figure. cell has sunk
into the segmentation cavity. cut off, all of which are eetomeres.
Theu a fourth set of four (4a, 46, 4c, id) is...
|Country of origin:
Liverpool Marine Biology Committee
||246 x 189 x 2mm (L x W x T)
||Paperback - Trade
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