«5 



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 rlexible, 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 tracé of an articulation, as in Xanthocalanus. The vaiïous 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. 



I. Amallophora typica T. Scott. Plate XXXVI, figs. i — 8. 



Amallophora typica T. Scott, 1893, p. 54, pis. III & IV. 

 Xanthocalanus typicus Giesbrecht & Schmeil, 1898, p. 50. 

 Xanthocalanus typicus Farran, 1908, p. 47, pi. 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 agilis, 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 

 ioint 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 ancl a basal part. The second joint is 

 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 Xorth Atlantic off the Coast of Ireland. 



8; 







