167 
The abdomen is moderately long. It is composed of three segments. The combined 
length of the abdomen and furca is contained two and one-third times in the total length of 
the cephalothorax, from the frontal margin to the base of the genital segment. The genital 
segment is symmetrical. It is as long as the combined length of the next two segments. The 
dorso-lateral surface is furnished with a strong spine on each side near the distal end. The 
second segment is asymmetrical. The distal end is provided with a double pointed process. 
The anal segment is asymmetrical. It is much shorter on the right side than-on the left. The 
distal end of the first and second segments, and the ventro-lateral surface of the second segment, 
is fringed with fine spines (Plate LI, figs. 1 and 2). The furcal joints are asymmetrical. The 
right furcal joint is much broader, and slightly longer than the left furcal joint. 
The antennules are composed of twenty-four joints and extend to the end of the anal segment. 
The antennae, mandibles, maxillae and maxillipedes are similar to those of the male. 
The apical portion of the second maxillipedes is four-jointed. 
The exopodites of the four pairs of swimming feet are three-jointed. The endopodites 
are two-jointed. 
The fifth pair of feet is slightly asymmetrical. The right exopodite is rather shorter and 
stouter than the left. Each exopodite is armed with three outer edge spines. The distal part 
of the inner margin bears two spines set close together. The proximal spine of this pair is 
longer and stouter than the distal one. The apex terminates in a strong and slightly curved 
spine. The endopodite of each foot is short. The apex is very feebly bifurcate. The figure 
shews the fifth pair in a reversed position (Plate LI, fig. 6). 
Length of ‘Siboga’ specimens, female 1,95 mm., male 1,7 mm. 
Professor Brapy described the species as a Pontel/a. Girsprecut placed it in the genus 
Labidocera on account of the two-jointed endopodite of the first pair of feet. Brapy and 
WOLFENDEN appear to be the only authors who have hitherto met with this form. 
5. Labidocera minuta Giesbrecht. 
Labidocera minutum Giesbrecht, 1889, p. 27. 
Labidocera minutum Giesbrecht, 1893, p. 446, pl. 23, 25 & 4I. 
Labidocera minuta Giesbrecht & Schmeil, 1898, p. 137. 
Labidocera minutum Cleve, 1901, p. 7. 
Labidocera minuta A. Scott, 1902, p. 407. 
Labidocera minuta Thompson & Scott, 1903, p. 251. 
Labidocera minutum Cleve, 1903, p. 363. 
Labidocera minuta Wolfenden, 1905(a), p. 1018, pl. XCVIII, figs. 18, 24, 25, 29, 32, 37. 
Eighteen females and nine males belonging to this species were obtained from the 
plankton collected at the following stations. 
Stat. 16. — Stat. 2g. —= Stn, a7. —= Stet ay = Siieles CGs —= SUM, le > SHANE in = SUEIES OO 
(night). — Stat. 106. — Stat. 109. — Stat. 110. — Stat. 128 (HENSEN vertical net, 700 
metres to surface). — Stat. 136. — Stat. 138. — Stat. 141 (HENSEN vertical net, 1500 
metres to surface). — Stat 142. — Stat. 143 (HENSEN vertical net, 1000 metres to sur- 
face). —— Stat, 144. — Stat. 169. — Stat. 174. — Stat. 189°. —- Stat. 204. — Stat. 205. — 
Stat. 213. — Stat. 216. — Stat. 229. — Stat. 315. 
167 
