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This species approaches Ladzdocera neri (Kroyer) in general appearance, but the structure 
of the fifth pair of both sexes readily separates it from that form, and from any of the other 
known members of the genus. 
The name is derived from Madura Strait, where the series of investigations in the 
Malay Archipelago carried out by this expedition began, and finally ended, after a year of 
exploring the seas and straits in the area. 
Occurrence. — One hundred and sixty females and four males were obtained from 
the plankton collected at the following stations. 
Stat. 16, 80 specimens. — Stat. 141 (HENSEN vertical net, 1500 metres to surface), 60 spe- 
cimens. — Stats. 194—7, 5 specimens. —. Stat. 203 (surface), 13 specimens. — Stat. 203 
(HENSEN vertical net, 1500 metres to surface), 2 specimens. — Stat. 282, 2 specimens. — 
Stat. 315, 2 specimens. 
Genus Pontellopsis Brady, 1883. 
The members of this genus are separated from Poxtella and Ladzdocera by the complete 
absence of dorsal and rostral lenses, and by the long slender rami of the rostrum. The structure 
of the fifth pair of feet of the two sexes is something similar to that found in Ponxtella. The 
endopodite of the first pair of feet is three-jointed. 
Eight species of Pontellopsis were obtained from the plankton collected by the ‘Siboga’. 
Two of the species do not appear to have previously been described. 
1. Pontellopsts armata (Giesbrecht). 
Monops armatus Giesbrecht, 1889, p. 28 
Monops armatus Giesbrecht, 1893, p. 487, pls. 26 & 41. 
Pontellopsis armata Giesbrecht & Schmeil, 1898, p. 148. 
Monops armatus Cleve, 1901, p. 7. 
Pontellopsis armata Thompson & Scott, 1903, p. 253. 
Pontellopsts armata Wolfenden, 1905(a), p. 1022, pl. XCIX. 
This species proved to be the most abundant and generally distributed member of the 
genus, as shewn by the records of its occurrence. 
Stat. 35. — Stat. 89. — Stat. 98, 23 females and 17 males. — Stat. 117%, 1 specimen. — 
Stat. 124, 8 specimens. — Stat. 138, 1 specimen. — Stat. 143 (HENSEN vertical net, 1000 
metres to surface), I specimen. — Stat. 144. — Stat. 157, 2 specimens. — Stat. 184. — 
Stat. 186, I specimen. — Stat. 189%, 3 specimens. — Stat. 193, 1 specimen. — Stats. 
194—7, 2 specimens. — Stat. 203 (surface), 9 specimens. — Stat. 213, 20 specimens. — 
Stat. 2153, 2 specimens. — Stat. 216, 2 specimens. — Stat. 217 (surface), 2 specimens. — 
Stat. 217 (horizontal cylinder), 2 specimens. — Stat. 222, 3 specimens. — Stat. 223, 2 spe- 
cimens. — Stat. 229, 15 specimens. — Stat. 245, I specimen. 
The female of Pontellopsis armata can readily be recognised by the hirsute body, by 
the elongate spiniform projections of the last thoracic segment, and by the structure of the 
fifth pair of feet. 
This species has been recorded from the Indian and Pacific Oceans. 
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