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The first two of these species, E. Chierchiae and E. aculeata, are eertainlv rather closely
connected to each other; on the other hand they show rather far-reac-hing differences from
E. lacunosa and E. d?Arcy-Thompsoni. It is rather difficult to say anything certain about the
relation between the two last-mentioned species, partly because the male of E. lacunosa is quite
unknown, and partly because of the incompleteness of the descriptions. But it seems to me
not improbable that they are fairly closely related. These reasons also make it impossible
to decide whether these two species are to be distinguished as the representatives of a
special sub-genus; it seems, however, fairly probable that future investigations will make
this necessary.
First antenna: G. W. Müller, in his work 1906 a, states that this antenna is five-jointed
in the male, „die Grenze zwischen dem 3. and 4. Glied ist schwer zu erkennen“. In his work
of 1912 this writer states that this antenna is four-jointed: „1. Antenne des 3 mit 3 längeren
Gliedern und einem 4. sehr kurzen Gliede“. In the latter work it is obvious that the third and
fourth joints are taken as one joint. As will be seen above, I hâve adopted the former view in
the genus description, because in the species investigated by me the two last-mentioned joints
were distinctly separated; the fourth joint (sensu meo) was even moved by several special muscles.
This same author writes in his work, 1890 a: „die Borste des zweiten Gliedes fehlt
überhaupt; an der Stelle, wo sie beim Weibchen von Conchoecia steht, findet sich eine flache Grube,
welche auf ihre frühere Existenz an dieser Stelle hinzuweisen scheint.“ It was unable to observe
any such cavity; it seems to me not at all impossible that this is a mistake on the part
of this writer.
In the diagnosis of this genus, 1906 a, p. 127, G. W. MÜLLER states that from the third
joint of the first antenna of the males „ragt ein hakenartiger Fortsatz in das 4. hinein; derselbe
liegt medial; ist nicht immer gleich deutlich. Ich habe keine volle Klarheit über seine Lage
und Bedeutung gewinnen können. Anscheinend liegt er im Innern des Gliedes, dient dem
Muskelansatz.“ — I was not able to observe any such chitinous process on the specimens of this genus
that were investigated by me. It does not seem impossible, however, that this is a mistake
on the part of G. W. Müller. The ventero-medial part of the wall of the fourth joint in the
male first antenna of E. Chierchiae is rather strongly chitinized. The dorsal boundary of this
part is indicated in the adjoining fig. 12 by a line running longitudinally at about half the height
of the joint. Does this part correspond to the process mentioned by G. \\. MULLER? This does
not seem impossible to me; its medial position is in favour of this; as is shown by the above
quotation, G. W. MÜLLER himself was not quite certain whether the process in question was
really situated inside the joint; its medial position, on the other hand, was quite clear. (This
process is not mentioned in this author’s work of 1912.)
Mandible: To judge from pi. X, fig. 7, G. W. Müller, 1908, E. lacunosa shows,
with regard to the structure of the pars incisiva of the coxale, a type quite different not only
from E. Chierchiae, described below, but from all the forms hitherto known in the family
Halo-cypridae. G. W. MUller’s reproduction and description of this organ are, however, so incomplete
and indistinct that I did not think it right to pay any attention to this information in working
out the genus and sub-family diagnoses.
Relations belween
the species.
First antenna.
Mandible.
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