223 



Occurrence. — One specimen was obtained from the plankton collected at Station 40, 

 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 is two-jointed, and the abdomen is composed of five segments. 

 The other appendages are quite similar to those of the female. 



1. Phyllopodopsyllus loiigicaudatus nov. sp. Plate LX, figs. 17 — -25. 



Male — length .5S 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 small (Plate LX, fig. 18). 



The anten nae, mandibles, maxillae and maxillipedes are similar to those of Phyllopodop- 

 syllus bradyi (T. Scott). 



The first pair of feet is moderately long and rather slender. The exopodite is three-jointecl. 

 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 



