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as Boj>-t/r/is mys'ulum and by Buchholz as L&ptophryxus mysidis,
and Dr. Hoek
records it also under the latter name, none of these authors having apparently
been aware of the fact that this form had long been recorded by Kr0yer
as Dajits myniflis. In more recent times MM. Giard and Bonnier have published
in the "Bulletin scientifique de la France" a very exhaustive description
of this
interesting form, accompanied by excellent figures, and they are indeed highly to
be commended, for giving such a full acount, considering that they had only
a solitary specimen at their disposal. As I have had an opportunity of examin-
ing numerous specimens of this form, I have been enabled to testify the great
exactness of the said distinguished French zoologists, and to supplement their ac-
count as regards the development of the species. In the 2 accompanying plates,
figures are given not only of the fully grown animal in both sexes, but also of
3 different stages of the female, of a young male in the Cryptoniscian stage,
and of an embryo in one of the latter stages. The peculiar larval form figured
at the bottom of PI. 94 was found in a sample of plankton from Nansen's
Expedition. It is figured here, because in the same sample several specimens of
the easily recognizable Cryptoniscian stage of Dajus were found, which makes
it highly probable that it represents the 1st free larval stage of the pre-
sent form.
Occurrence. I have taken this form not infrequently from 2 different
species of Mysis. viz. M. on data Fabr. and .!/. m'i.>1