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The genus Amallophora is restored in the present report for the typical species, which 
was represented in the plankton collected by the ‘Siboga’, 
Amallophora can be distinguished from Xanthocalanus, or any of the other genera of 
the family Phaennidae, by the structure of the first pair of maxillipedes. The apical lobes are 
furnished with large flexible, densely plumose setae, and the sensory apparatus is represented 
by one very short and stout appendage, with a densely ciliated head. No other type of sensory 
organ is present in the male at anyrate. The rostrum is bifurcate. The rami are drawn out into 
slender filaments, but have no trace of an articulation, as in Xanxthocalanus. The various appen- 
dages are somewhat similar to those of Xanthocalanus agilis. The fifth pair of feet of the 
female is represented by two free joints attached to a basal portion. The left exopodite of the 
male fifth pair is long and slender. The right exopodite is short and rudimentary. 
1. Amatllophora typica T. Scott. Plate XXXVI, figs. 1—8. 
Amallophora typica T. Scott, 1893, p. 54, pls. II & IV. 
Xanthocalanus typicus Giesbrecht & Schmeil, 1898, p. 50. 
Xanthocalanus typicus Farran, 1908, p. 47, pl. IV, figs. 15—17. 
One male was obtained from the plankton collected with the HeNsEN vertical net at 
Station 148, 1000 metres to the surface. 
Amallophora typica has a close resemblance to Xanthocalanus agtlis, but it is easily 
separated by the possession of a single stout sensory organ on the apex of the first pair of 
maxillipedes, and by the absence of the strong claw-like spines with their coarsely dentate 
inner margin. The rami of the rostrum are very stout at the base, and are produced into long 
slender filaments. 
The exopodites of the four pairs of swimming feet are all distinctly three-jointed. The 
endopodite of the first pair of feet is one-jointed, of the second, two-jointed, of the third and 
fourth, three-jointed. 
The exopodite of the left fifth foot consists of five free joints attached to a basal part. 
The inner distal angle of the fourth joint is furnished with a two-jointed appendage, the second 
joint of which is traversed by a transverse row of long hairs. The fifth joint bears a small 
apical spine. The right foot is composed of four joints and a basal part. The second joint 1s 
furnished with a small outer-edge spine. The fourth joint is truncate at the apex and bears 
two small apical spines. Length of male 2,66 mm. 
Farran has recently discovered what appears to be the female of this species, in plankton 
collected from the deep water off the West of Ireland. It also possesses the single large sensory 
appendage on the apex of the first maxillipedes. The fifth pair of feet is somewhat similar in 
structure to that of Xanthocalanus, but the second free joint has a truncate apex and bears 
two apical spines. The terminal joint of the female fifth foot is not unlike the last joint of the 
right foot of the male. 
Amallophora typica has, so far, only been recorded from the Gulf of Guinea, and from 
the North Atlantic off the Coast of Ireland. 
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