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Mandible (PI. XIX, fig. 3): distance between extremities of teeth 1 and 2 greater 

 than that between 2 and 3. Tooth 3 thick, 4 distinct and doublé, 5 together with inferior 

 angle represented by three short spine-like teeth, the last of which is somewhat longer. Hairs 

 along inferior margin few, rather long. (The first of the three short spine-like teeth in some 

 specimens is somewhat stronger, and represents in that case, tooth 5). 



Max il la (PI. XIX, fig. 4 and 4*) : with a broad notch behind the upper pair of spines. 

 The remaining part of the edge forms an indistinct step-like projection and is furnished with 

 4 to 5 somewhat shorter and narrower, and 2 longer spines of about the same length as those 

 of the upper pair. 



Ou ter maxillae (PI. XIX, fig. 5): the outer lobe short and broad, covered near 

 the extremity with a tuft of — in comparison with other species — not very numerous hairs. 

 A few hairs are disposed along a longitudinal line extending over the outer lobe towards the 

 margin of the inner lobe. The latter has a somewhat quadrate form; towards the inner side 

 it is furnished with not very numerous, but long and feathered hairs, which, most of them, 

 point towards the basis of the maxilla. 



Cirri. First pair has unequal rami of 6 and 10 segments. The segments of the shorter 

 ra mus have rounded protuberances covered with hairs; the segments 3 — 6 of the longer 

 ramus show only indistinct protuberances. 



Second pair has the rami slightly unequal only of 6 to 7, and 7 to 8 segments; 

 segments with somewhat rounded inner faces, hardly protuberant, on which rather dense tufts 

 of hairs are disposed. 



Third pair has 8 and 9 segments in the two rami, tufts of hairs disposed on the 

 rounded inner face near the extremity; hairs less dense on the lower segments of the longer 

 ramus. No teeth to be seen along the inner faces of the segments. 



F o u r t h pair has 1 3 ancl 1 5 segments in the two rami ; the greatest number of spines 

 on the inner face of the segments is 4 pairs. 



Sixth pair (PI. XIX, fig. 6) with 17 and 18 segments in the two rami; the greatest 

 number of spines on the inner face of the segments is 5 pairs. 



Penis long, tapering towards the extremity. Numerous hairs scattered over surface : a 

 tuft of rather long and numerous hairs is situated at and near the extremity. 



This species was dredged by the Siboga at: 



Stat. 136. Between July 29 and August 3. Ternate-anchorage. Depth 27 m. Bottom: mud and 

 stone. Numerous specimens on the surface of pieces of rock. 



To the same species probably belong two very small specimens (PI. XIX, fig. 7) 

 which were dredged at : 



Stat. 260. December 16 and 18, 1S99. Lat. 5° 36'. 5 S., Long. 132° 55'. 2 E. N.W. from the North- 

 point of Nuhu Jaan, Kei-islands. Depth 90 m. Bottom: sand, coral, and shells. 



13. Balanus ciliaftts n. sp. PI. XIX, fig. 8 — 16. 



Parietes, radii and basis without pores. Basis calcareous. Radii broad, summits oblique 



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