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I prefer to regard the ‘Siboga’ specimens as distinct. The appendicular seta and the second 
inner seta on the furcal joints are of about equal length. They are longer than any of the others. 
Occurrence, — Five specimens were obtained from the plankton collected with the 
HENSEN vertical net at the following stations. 
Stat. 230 (2000 metres to surface), 2 specimens. — Stat. 243 (1000 metres to surface), 2 
specimens. — Stat. 276 (750 metres to surface), I specimen. 
Genus Valdiviella Steuer, 1904. 
This genus was established by SreveR in 1904 for a Calanoid closely related to Luchaeta, 
but easily recognised by its bifurcate rostrum. The incomplete jointing of the exopodites of the 
first and second pairs of feet, and the indistinctly three-jointed endopodites of the third and 
fourth pairs of feet are also characters of this genus. 
Two species belonging to this genus were found in the plankton collected by the ‘Siboga’ 
in the Malay Archipelago. 
1. Valdiwiella gigas (Brady). Plate XXII, figs. 17—26. 
Euchaeta gigas Brady, 1883, p. 65, pl. XXII, figs. 1—5. 
One specimen of a form apparently identical with the species described by Brapy in 
the report on the ‘Challenger’ Copepoda as Zuchaeta gigas, was found in the plankton collected 
with the HENsEN vertical net at Station 230, 2000 metres to the surface. 
The rostrum is distinctly bifurcate. The fourth and fifth thoracic segments are completely 
separated. The last thoracic segment is produced posteriorly into small points. The specimen 
was immature and possessed a fifth pair of feet similar to that shewn by Brapy. 
The antennules are twenty-three-jointed, and a number of the joints are furnished with 
sensory organs. 
_ The antennae, mandibles, maxillae and maxillipedes are of the normal female Paraeuchaeta 
type. The mandible is well developed and is provided with cutting teeth. 
The exopodite of the first pair of feet is composed of two joints. The middle of the 
outer margin of the first joint is furnished with a strong spine. 
The exopodite of the second pair of feet is very indistinctly three-jointed. The division 
between the first and second joint is only marked by an overlapping at the base of the outer- 
edge spine, and by a seta on the inner margin. The endopodite is one-jointed. 
The exopodites of the third and fourth pairs of feet are indistinctly three-jointed. The 
endopodites are two-jointed. 
The fifth pair of feet is almost symmetrical but is very rudimentary. Each foot consists 
of a two-jointed basiopodite, a moderately long unjointed exopodite, and a small endopodite. 
The abdomen is composed of four segments. The genital segment is shorter than any 
of the others. 
Length 8 mm. The size of the form described in the report on the ‘Challenger’ Copepoda 
is given aS 5,25 mm. 
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