To the question, how far the development of Ligia is repeated in
the other Isopoda, I can only give an unsatisfactory answer. The
curvature of the embryo upwards instead of downwards was met with
by me as well as by Rathke in Idothea, and likewise in Cassidina,
Philoscia, Tanais, and the Bopyridae,--indeed, I failed to find it
in none of the Isopoda examined for this purpose. In Cassidina also
the first larval skin without appendages is easily detected; it is
destitute of the long tail, but is strongly bent in the egg, as in
Ligia, and consequently cannot be mistaken for an "inner
egg-membrane."
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