17 



Stat. 273. December 23/26. Anchorage off Pulu Jedan, East coast of Aru-islands. (Pearl-banks) 

 13 m. Bottom sand and shells, i specimen. 



This specimen, of which I did not succeed in e.xamining the 2^"^ pleopod, so that it 

 remains uncertain whether it is a female or the still unknown male, has nearly the same size 

 as the egg-bearing female, on which this species was founded by me in 19 10, being 6,3 mm. 

 long from tip of rostrum to end of telson ; the carapace and the abdomen, rostrum, respectively 

 telson included, measure 2-,26 mm. and 4,04 mm. The rostrum, which is 0,72 mm. long 

 measured from the level of the orbital margin to the tip, almost half as long as the rest of 

 the carapace, extends just beyond the 2"'^ antennular article and the tip is slightly turned up- 

 ward; the lateral margins are not straight as in Fig. 4 of my work, but very slightly convex 

 along the two posterior thirds and very slightly concave distally, so that the form is somewhat 

 different, and they make a distinct angle with the orbital margin of the carapace ; at the level 

 ■of these angles, thus a little in front 'of the orbital margin, the rostrum is 0,24 mm. broad. 

 Looked at from above the extra-corneal spine hardly projects beyond the eye, the infra-corneal 

 reaches almost its anterior margin, just like in Fig. 4; in a lateral view the extra-corneal spine 

 reaches the tip of the eye, the other almost just as far. 



Eyes black, distinctly faceted. The 2°^ joint of the antennular peduncle appears in this 

 specimen as long as wide and but a little shorter than the y^, the stylocerite extends almost 

 to the distal margin of the 2"*^ joint, the terminal spine of the scaphocerite, finally, appears 

 more slender than in Fig. 4, being 2Yo-times as long as wide at its base. 



Telson 0,72 mm. long, just as long as the rostrum, 4-times as long as the distance 

 between the postero-lateral angles is wide, this distance half as broad as the width at base. 

 Legs of the i^' pair like in the type, equal. Merus 5-times as long as wide, carpus measuring 

 two-thirds the length of the merus, 3-times as long as thick at the distal end, chela not longer, 

 but a trifle shorter than the merus, the proportion being Hke i : 0,95 ; measured in the plane 

 •of the fingers, the chela proves to be 4,1 -times as long as wide, proportion between the length 

 of the fingers and that of the chela like i : 2,2. 



Merus of 2"'^ legs 6, 4-times as long (0,64 mm.) as wide (0,1 mm.), carpus i, 4-times as 

 long as the merus, the 5 segments are respectively 0,38 mm., 0,11 mm., 0,11 mm., 0,11 mm. 

 and 0,18 mm. long; chela 0,38 mm. long, as long as the 1=' segment, fingers as long as the palm. 



Ischium of 3"^ legs with two spines on the posterior margin, the posterior a little longer 

 than the other. Relative dimensions of 3'''^ pair: merus 1,9, carpus i, propodus 2,05; merus 

 6, 4-times, propodus 9,7-times as long as wide, carpus 3,8-times as long as thick at distal end; 

 propodus with four short spinules besides two at the distal end, of which the longer is half as 

 long as the dactj-lus and almost one-sixth the length of the propodus. The dactylus, which is 

 6-/3-times as long as broad at its base, measures more than one-third of the propodus, the 

 proportion being like 16 : 39; ventral hook half as long as the principal, the latter little more 

 than twice as wide at its base as the ventral, the proportion being as 7 : 2>- 



Ischium of 4''^ legs also with two spines on the posterior margin, but the anterior 

 comparatively shorter than in the 3''^' pair. Relative dimensions of 4"* legs: merus 1,94, carpus i, 

 propodus 2,22. Merus 6-times, propodus 9-times as long as wide, carpus 3, 5-times as long as 



SIBOGA-EXrEDITIE XXXIX «♦. 3 



