20Ö 



Occurrence. - - One specimen was found in the washings from dredged invertebrata 

 collected at Station 273, from a depth of 13 metres. 



Genus Eupeltidium nov. 



The body is rather short and somewhat depressed. The exoskeleton is dense and has 

 no tracé of anastomosing chitinous bands. The lateral margins of the thoracic segments are 

 considerably expanded. The abdomen is short and broad. The genital segment is much larger 

 and wider than the other abdominal segments. The antennules are composed of six joints. The 

 endopodite of the antennae is indistinctly three-jointed. The exopodite is short and two-jointed. 

 The mandibles are moderately strong and are furnished with a small one-branched palp. The 

 first pair of maxillipedes is similar to that of the genus Alteutha Baird (1845). The terminal 

 joint is produced into a short stout claw. The second pair of maxillipedes is similar to that of 

 the genus Alteutha and Peltidium. The five pairs of feet are similar to those of Pcltidium. 



This genus appears to be somewhat intermediate between Alteutha and Peltidium. It 

 resembles Alteutha in the general appearance of the animal and in the structure of the first 

 pair of maxillipedes. The five pairs of feet are nearly similar to those of Peltidium, The biting 

 edgfe of the mandible is distinct from that found in either of the two genera. 



One species belonging to this genus was found in the material collected by the 'Siboga' 

 in the Malay Archipelago. 



1. Eupeltidium glabrum nov. sp. Plate LXIV, figs. 12 — 19. 



Female — length 1,2 mm. 



Seen from above, the body appears moderately robust. It is elongate ovate in outline. 

 The greatest width is near the posterior end of the cephalic segment and is equal to half the 

 entire length of the animal. The distal ends of the cephalic and thoracic segments are narrowly 

 rounded. The rostrum is moderately large but it is not very prominent. The frontal margin is 

 broadly rounded. The genital segment is large and broad. It is marked by a distinct suture 

 traversing the dorsal surface. The distal ends of the segment are very narrowly rounded and 

 are only very slightly produced. The furcal joints are somewhat cylinclrical in shape. Each joint 

 is two and a half times longer than broad and the middle of the outer margin is furnished 

 with a short seta. The principal terminal seta is long and moderately stout (Plate LXIV, fig. 12). 



The antennules are composed of six joints. The fifth joint is very short. The fourth and 

 fifth joints each carry one long sensory organ. 



The antennae are similar to those of Alteutha depressa Baird, but the apical spines on 

 the last joint of the endopodite are rather stronger (Plate LXIV, fig. 14). 



The cutting edge of the mandible is provided with seven short and moderately stout 

 teeth. The palp is comparatively small, one-branched, and two-jointed (Plate LXIV, fig. 15). 



The first and second pairs of maxillipedes are nearly similar to those of Alteutha depressa. 



The exopodite of the first pair of feet is short, comparatively stout, and three-jointed. 

 The second joint is longer than the other two joints. The third joint is small. It is furnished 

 with one stout and one slender curved claw. The endopodite is two-jointed and is nearly as 



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