228) 
Occurrence. — One specimen was obtained from the plankton collected at Station 4o, 
off Pulu Kawassang, Paternoster Islands. 
Genus Phyllopodopsyllus T. Scott, 1896. 
The females of this genus can readily be separated from the other members of the 
family by the very large, one-jointed, foliaceous fifth pair of feet, and by the strong claw-like 
projection of the second joint of the antennules. The male has hitherto been unknown. A single 
male specimen belonging to this genus was found in the plankton collected by the ‘Siboga’ 
and some further particulars regarding the genus now become available. | 
The male resembles the female in general appearance except that the antennules are 
prehensile, the fifth pair of feet 1s two-jointed, and the abdomen is composed of five segments. 
The other appendages are quite similar to those of the female. 
1. Phyllopodopsyllus longicaudatus nov. sp. Plate LX, figs. 17—25. 
Male — length .58 mm. 
Seen from the side, the anterior part of the body appears rather robust and the abdomen 
is moderately long and narrow. The cephalic segment is large and inflated, and is equal to 
twice the combined length of the first three thoracic segments. The rostrum is very small and 
inconspicuous. 
The abdomen is composed of five segments. The first four segments are of nearly 
equal length. The anal segment is shorter than the others. The anal operculum is broad and 
is very slightly rounded. It is fringed with short hairs. The furcal joints are long and slender, 
and are slightly curved. The joints are as long as the combined length of the last three 
abdominal segments. Each joint is furnished with two small outer edge spines and two apical 
setae. The principal apical seta is comparatively short (Plate LX, fig. 25). 
The antennules are eight-jointed. The second joint is produced ventrally into a large 
well defined tooth. The fifth joint is slightly inflated and cylindrical in shape. It is furnished 
with a long slender sensory filament. The hinge is placed between the fifth and sixth joints. 
The seventh joint is very saalll (Plage ILC, ing, 16). 
The antennae, mandibles, maxillae and maxillipedes are similar to those of Phyllopodop- 
syllus bradyt (T. Scott). 
The first pair of feet is moderately long and rather slender. The exopodite is three-jointed. 
The endopodite is two-jointed and is considerably longer than the exopodite. The first joint is 
distinctly longer than the combined length of the joints of the exopodite. The inner marginal 
seta is situated about one-third from the distal end. The second joint is short and is only one- 
fourth of the length of the first joint. The apex is furnished with two setae (Plate LX, fig. 21). 
The second, third and fourth pairs of feet are similar to those of Phyllopodopsyllus 
bradyi (T. Scott). The exopodites are three-jointed. The endopodites are two-jointed and are 
very much shorter than the exopodites. The endopodite of the second and third pairs of feet 
is as long as the first joint of the exopodite. The two joints are of nearly equal length. The 
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