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Pleuromamma xiphias resembles Pleuromamma abdominalts in the structure of the fifth 
feet of the two sexes. The males and females, however, can readily be separated by the presence 
of a prominent spiniform process on the forehead. 
This species appears to have a moderately wide distribution in the great oceans. 
13. Family Lucicurmpae. 
Genus Lucicutia Giesbrecht, 1808. 
The members of this genus can be recognised by the moderately long abdomen, and 
quite symmetrical furcal joints. The fifth pair of feet of the female is somewhat similar to the 
third and fourth pairs, but the inner distal angle of the second joint of the exopodite is furnished 
with an awllike spine. The exopodite and endopodite of the male left fifth foot are three- 
jointed. The exopodite and endopodite of the right foot are two-jointed. The right exopodite 
is claw-like. 
Seven species were represented in the plankton collected during the investigations of 
the ‘Siboga’ in the Malay Archipelago. Two of the species appear to be undescribed. 
1. Lucicutia flavicornis (Claus). 
Leuckartia flavicornis, Claus, 1863, p. 183, pl. XXXII. 
Leuckartia flavicornis, Giesbrecht, 1893, p. 358, pls. 5, 19 & 38. 
Lucicutia flavicornis, Giesbrecht & Schmeil, 1898, p. III. 
Leuckartia flavicornis, Cleve, 1901, p. 7. 
Leuckartia flavicornis, Wolfenden, 1902, p. 363. 
Lucicutia flavicornis, A. Scott, 1902, p. 405. 
Lucicutia flavicorms, 1. C. Thompson, 1903, p. 25. 
Lucicutia flavicorns Thompson & Scott, 1903, p. 249. 
Lucicutia flavicornis Cleve, 1903, p. 364. 
Lucicutia flavicornts Wolfenden, 1904, p. 111 & 112. 
Lucicutia flavicornis Cleve, 1904, p. 102. 
Lucicutia flavicornis Wolfenden, 1905(a@), p. 1012. 
Lucicutia flavicornis Sars, 1905 (0), p. 3. 
Lucicuiia flavicornis Farran, 1905, p. 43. 
Lucicutia flavicornis Esterly, 1905, pl 180, fig. 36. 
Lucicutia flavicornis Pearson, 1906, p. 25. 
Lucicutia flavicornis Farran, 1908, p. 64. 
Luciutia flavicornis van Breemen, 1908, p. 112, fig. 129. 
This species proved to be well distributed in the Malay Archipelago. It was found in 
the plankton collected at the following stations. 
Stat 16. — Stat. 35. — Stat. 37. — Stat. 47°. — Stat. 66. — Stat. 75 (HENSEN vertical 
net, If metres to surface). — Stat. 81. — Stat. 96 (night). — Stat. 98. — Stat. 110. — 
Stat. 1177. — Stat. 118 (HENSEN vertical net, 900 metres to surface). — Stat. 141 (HENSEN 
vertical net, 1500 metres to surface. — Stat. 143 (HENSEN vertical net, 1000 metres to 
surface). — Stat. 184. — Stat. 185 (HENSEN vertical net, 1536 metres to surface). — Stat. 
203 (HENSEN vertical net, 1500 metres to surface). — Stat. 205. — Stat. 213. — Stat. 220 
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