The works of Francis Maitland Balfour, Volume 2 (of 4) : $b A treatise on comparative embryology: InvertebrataBalfour, Francis M. (Francis Maitland)
Science
The works of Francis Maitland Balfour, Volume 2 (of 4) : $b A treatise on comparative embryology: Invertebrata
Balfour, Francis M. (Francis Maitland)
Embryology; Zoology
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CHAPTER VII.
PLATYELMINTHES[89].
[89] I. Turbellaria.
1. Dendrocoela.
2. Rhabdocoela.
II. Nemertea.
1. Anopla.
2. Enopla.
III. Trematoda.
1. Distomeæ.
2. Polystomeæ.
IV. Cestoda.
TURBELLARIA.
Although there is perhaps no group in the animal kingdom the ontogeny
of which would better repay a thorough investigation than the
Turbellarians, yet the difficulties to be overcome have hitherto
proved too great.
The fresh-water Rhabdocoela and Dendrocoela do not undergo any
metamorphosis, and leave the ovum in a condition in which they cannot
easily be distinguished in their general appearance from Infusoria.
Many marine Dendrocoela also develop directly, while, as was first
shewn by Joh. Müller, other marine Dendrocoela undergo a more or
less complicated metamorphosis.
Marine Dendrocoela. Of the marine Dendrocoela which do not undergo a
metamorphosis the form most fully worked out is Leptoplana
tremellaris--(vide Keferstein, No. 187, and Hallez, No. 185).
The ova are surrounded by large albuminous capsules secreted by a
special gland. They are laid a great number at a time, and
adhere together so as to form masses not unlike the spawn of
nudibranchiate Molluscs.
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