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The distal ends are provided with small points. The segment is one and two-third times longer 

 than the combined length of the next two segments. lts length is rather shorter than the 

 united length of the next two segments and furcal joints. The second and third segments are 

 sub-equal in length. The distal end of the third segment is decidedly expanded. The furcal 

 joints are three times longer than the anal segment. Each joint is furnished with one outer 

 marginal seta and live apical setae. The middle apical seta is shorter than the others (Plate 

 LVIII, fig, 3 )- 



The antennules are four-jointed and are equal to two-fifths of the length of the cephalothorax. 



The fifth pair of feet is long and slender and is without apical division. The apex is 

 furnished with two moderately strong setae (Plate LVIII, fig. 4). 



This species is readily recognised by the reticulated exoskeleton and by the long slender 

 fifth pair of feet. 



Occurrence. — One female was found in the plankton collected at Station 142, off 

 Laiwui, coast of Obi Major. 



8. Monstrilla turgida nov. sp. Plate LVIII, figs. 5 and 6. 



Female — length 2 mm. 



Seen from above, the body appears rather short and is moderately robust. The cephalic 

 segment is greatly inflated just behind the frontal margin. It is slightly longer than the posterior 

 part of the animal. The frontal margin is broad and boldly rounded. 



The abdomen is composed of three segments. The genital segment is sub-quadrangular 

 in shape and is traversed near the middle by a distinct suture. It is one and a halt times 

 longer than the combined length of the next two segments. The segment is nearly as long as 

 the united length of the next two segments and furcal joints. The second and third segments 

 are sub-equal in length. The furcal joints are slightly longer than broad and are about one 

 and a half times longer than the anal segment. Each joint is furnished with one outer marginal 

 seta and five apical setae. The apical setae are sub-equal in length (Plate LVIII, fig. 5). 



The antennules are four-jointed and are equal to one-third of the length of the 

 cephalic segment. 



The fifth pair of feet is moderately long and rather slender. The apex is bi-lobed. The 

 inner lobe is narrower than the outer lobe and extends beyond the apex of it. It is furnished 

 with one seta. The outer lobe is furnished with three setae (Plate LVIII, fig. 6). 



This species can easily be separated from the other members of the genus by the very 

 tumid cephalic segment, and by the shape of the fifth pair of feet. 



Occurrence. — Two females were obtained from the plankton collected at Station 

 142, off Laiwui, coast of Obi Major. 



Genus Thaumaleus Kroyer, 1849. 



The members of this genus are closely related to Monstrilla in general appearance, in 

 the jointing of the antennules, in the entire suppression of the antennae, mandibles, maxillae 



2 39 



