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1. Pachysoma punctatum Claus. 
Pachysoma punctata Claus, 1863, p. 163, pl. XXV. 
Pachysoma punctatum Brady, 1883, p. 121. 
Pachysoma punctatum Giesbrecht, 1893, p. 612, pls. 4 & 48. 
Pachysoma punctatum TY. Scott, 1803, p. 119, pl. XIII, figs. 18—24. 
Specimens identical with the above species were found in the plankton collected at the 
following four stations. 
Stat. 142, I specimen. — Stat. 143 (HENSEN vertical net, 1000 metres to surface), 3 speci- 
mens. — Stat. 144, I specimen. — Stat. 185 (HENSEN vertical net, 1536 metres to sur- 
face), I specimen. 
Pachysoma punctatum can readily be separated from Pachysoma tuberosum Giesbrecht, 
by the second and third abdominal segments being of nearly equal length. The second segment 
of the abdomen of Pachysoma tuberosum is distinctly shorter than the third segment. 
This species has hitherto only been known from the Atlantic Ocean, and from the 
Mediterranean. 1 FR 
Genus Hermannella Canu, 1891. 
The members of this genus can be recognised by the stylet-shaped form of the mandible 
and of the first pair of maxilipedes, and by the exopodites and endopodites of the first four 
pairs of feet being three-jointed. 
The three-jointed exopodite and endopodite of the fourth pair of feet is the principal 
character that distinguishes this genus from Lzchomolgus and Pseudanthessius. 
One species, apparently undescribed, was represented in the plankton collected by the 
‘Siboga’ in the Malay Archipelago. 
1. Hermannella concinna nov. sp. Plate LXVIII, figs. 1—10. 
Female — length 2,9 mm. 
Seen from above, the body appears nearly circular in outline. The frontal margin is 
broadly rounded. The fifth thoracic segment is comparatively large and is sub-quadrangular in 
shape, with the anterior and posterior ends considerably contracted. 
The abdomen is composed of four segments. The combined length of the abdomen 
and furcal joints is contained nearly twice in the total length of the cephalothorax, from the 
frontal margin to the distal end of the fifth thoracic segment. The genital segment is rather 
large and is moderately expanded in the middle. It is as long as the combined length of the 
second and third segments added to half of the length of the anal segment. The second and 
fourth segments are sub-equal in length. The third segment is much smaller than the others. 
The furcal joints are cylindrical and of moderate length. The joints are slightly longer than 
the anal segment and are furnished with one outer marginal seta, and four apical setae 
(eics ILYOWIUUL, ine, 30), 
The antennules are slender and seven-jointed. The second and fourth joints are long. 
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