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Synonyms.
is about as long as tbe second exopodite joint. Second joint: The two ventral bristles have
short, fine hairs and are in most cases somewhat longer relatively than those of the male. Third
joint: The bristles are like tkose of the male, with short, fine hairs. End joint: The dorsal
one of the three bristles is in most cases about as long as the total length of the three distal
joints; the middle bristle is somewhat shorter, the ventral one is the shortest, being about
a third shorter than the dorsal one ; these three bristles are of the same types as the corresponding
bristles on the fifth limb. Pilosity : Hairs are developed at the saine places as in the male sixth
limb, but are in most cases somewhat more abundant.
The rod-shaped organ (fig. 13) is of the same type as in the male and reaches
to about the point of the first antenna.
E g g s : — A particularly interesting point about this species is that the female carries
her eggs for a time between the back of the body and the shell; as has already been pointed out
(p. 561 above), this is the onlycase of care of the brood that has been found so far. (Curiously
enough, it is not mentioned by preceding authors, although they investigated females; this
faet has helped to prevent E. Chierchiae, G. W. MÜLLER, 1906 a and 1908, from being included
in the list of synonyms given above; there were no females in the material of this species
investigated by G. W. MÜLLER, 1890 a.) Some of the females investigated by me had no eggs
in their brood-chambers; in others two to seven or even eight eggs were found; the eggs
in the brood-chamber were comparatively large; cf. the adjoining figures 6 and 7.
Remarks: — The form described by me above is either very closely related to the E.
Chierchiae from the coast of Brazil described by G. W. MÜLLER, 1890 a, or else it is identical
with this form. In spite of a number of differences between the original description of this
species of G. W. MüLLER’s and the specimens on which the description worked out by me above
is founded I decided in favour of the latter alternative. This was due, first, to the faet that
a number of the specimens investigated by me were caught not far from the type-locality of
the species just mentioned, and, secondly, to the superficial nature of G. W. MüLLER’s original
description, which makes it not improbable that these differences are due to mistakes on the
part of this writer.
The following are the main differences between the original description of E. Chierchiae
worked out by G. W. Müller and the specimens investigated by me:
Shell: The right valve always had a moderately long spine postero-dorsally in the
specimens investigated by me. In G. W. Müller’s original description it is stated that
a spine of this sort was only found sometimes (five mature males were investigated by this
author): „Bisweilen ist der rechte Vorsprung in eine Spitze ausgezogen“; pl. XXVIII, fig. 8
in this work of G. W. Müller’s represents a shell with such a spine; in the explanatiori of the
figure this type is described as an „abweichende Form“. According to this writer’s exposition
the left valve is never provided with a spine dorso-posteriorly in this species; in addition this
species has no selvage: „Saum scheint überhaupt zu fehlen.“
First antenna: While the specimens described by me above had somewhat more
than twenty sensory bristles on the fourth joint, arranged in three almost parallel rows,
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