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Mandible (Pl. XIX, fig. 3): distance between extremities of teeth 1 and 2 greater 
than that between 2 and 3. Tooth 3 thick, 4 distinct and double, 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). 
Maxilla (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. 
Outer maxillae (Pl. 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 
ramus 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 g 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. 
Fourth pair has 13 and 15 segments in the two rami; the greatest number of spines 
on the inner face of the segments is 4 pairs. 
Sixth pair (Pl. 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 (Pl. XIX, fig. 7) 
which were dredged at: 
Stat. 260. December 16 and 18, 1899. 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 ciliatus n. sp. Pl. XIX, fig. 8—16. 
Parietes, radii and basis without pores. Basis calcareous. Radii broad, summits oblique 
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