38) 
1. Gaidiopsis crassirostrts nov. sp. Plate VII, figs. 12—22. 
Female — length 3 mm. 
Seen from above, the cephalothorax is oblong ovate and moderately robust. The frontal 
part is considerably contracted, and the frontal margin is produced into a rounded knob. The 
head is fused with the first thoracic segment. The fifth thoracic segment is distinctly separated 
from the fourth, and is produced into strong lateral spines, which project beyond the middle 
of the genital segment. The rostrum is short and very stout, without a trace of bifurcation. 
The combined length of the abdomen and furca, is rather less than one-third of the 
total length of the cephalothorax, from the frontal margin to the base of the genital segment. 
The genital segment is broad and slightly swollen below. It is as long as the combined length 
of the next two segments. The second and fourth segments are of about equal length. The 
third segment is distinctly shorter than the others. The furcal joints are nearly twice as long 
as broad, and are as long as the anal segment. 
The antennules are twenty-four-jointed, and extend to the end of the furca. 
The antennae, mandibles, maxillae and maxillipedes, are similar to those of the genus 
Gadius. 
The exopodite of the first pair of feet is distinctly three-jointed, and the first joint is 
furnished with one outer-edge spine. 
The second, third, and fourth pairs of feet are similiar in structure to those of Gazdzus. 
The endopodite of the second pair of feet is distinctly two-jointed. The first joint of the basio- 
podite of the third and fourth pairs of feet is furnished with a number of fine hairs on the 
inner margin. 
The fifth pair of feet is absent. 
Occurrence. — One female was found in plankton collected with the HENSEN vertical 
net at Station 203, 1500 metres to the surface. 
The species is easily recognised by its very swollen one-pointed rostrum, and by the 
complete segmentation of the fourth and fifth thoracic segments. 
Genus Euchirella Giesbrecht, 1888. 
Head with or without a crest. Rostrum one spined or absent. Last thoracic segment 
rounded or pointed. The endopodite of the antennae is usually shorter than the exopodite. The 
first joint of the basiopodite of the fourth pair of swimming feet of the female, is furnished 
with one or more spines on the inner margin. 
Eleven species belonging to this genus were found in the plankton collected by the 
‘Siboga’, three of which appear to be undescribed. 
1. Euchirella amoena Giesbrecht. 
Euchirella amoena Giesbrecht, 1888, p. 336. 
Euchirella amoena Giesbrecht, 1893, p. 233, pls. 15 & 36. 
Euchirella amoena Giesbrecht & Schmeil, 1898, p. 36. 
Euchirella amoena Esterly, 1905, p. 155, fig. 21. 
53 
