23§ 



short and moderately wide. It does not extend beyond the apex of the outer lobe. It is 

 furnished with two apical setae. The apex of the outer lobe is directed at almost right angles 

 to the body and is furnished with three setae (Plate LVII, fig. 10). 



This species can readily be recognised by the shape and armature of the fvfth pair of feet. 



Occurrence. - - One female was obtained from the plankton collected at Station 99, 

 off North Ubian, Sulu Islands. 



6. Monstrilla hclgolandica Claus. Plate LVIII, figs. 1 and 2. 



Monstrilla helgolandica Claus, 1863, p. 165, pis. XII & XIII. 

 Monstrilla helgolandica Timm, 1896, p. 376, pis. 5 & 6. 

 Monstrilla helgolandica van Breemen, 1908, p. 207, fig. 218. 



Female — length 2,07 mm. 



Seen from above, the body appears moderately long and slender. The cephalic segment 

 is contracted in front and is slightly inflated in the middle. It is considerably longer than the 

 posterior part of the animal. The frontal margin is broadly rounded. 



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

 shape. It is contracted in the middle but it is not traversed by a suture. The segment is one 

 and a half times longer than the combined length of the next two segments. It is as long as 

 the united length of the next two segments and furcal joints. The anal segment is slightly 

 shorter than the second segment. The furcal joints are as long as the anal segment. Each 

 joint is furnished with one outer marginal seta and five apical setae. The middle apical seta 

 is much shorter than the others (Plate LVIII, fig. 1). 



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

 cephalic segment. 



The fifth pair of feet is very small and divergent. The apex is directed at right angles 

 to the body and is furnished with two setae (Plate LVIII, fig. 2). 



The illustrations given in this report agree very well with the figures by R. Timm (1896). 



Occurrence. — One female was obtained from the plankton collected at Station 99, 

 off North Ubian, Sulu Islands. 



Monstrilla helgolandica has only previously been recorded from the North Sea, Skager 

 Rack, and Eno-lish Channel. 



7. Monstrilla longipes nov. sp. Plate LVIII, figs. 3 and 4. 



Female — length 1,85 mm. 



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

 segment is much inflated just behind the front margin. It is considerably longer than the 

 posterior part of the animal. The frontal margin is wide and broadly rounded. The exoske- 

 leton of the cephalic and first three thoracic segments is marked by fine reticulations that are 

 beset with minute spines. 



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

 in outline. It is slightly contracted at the middle where it is traversed by a distinct suture. 



238 



