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a half times the distance between the extremities of teeth 2 and 3. Tooth 5 pointed. Lower 
angle small, yet well-developed, and terminating in 2 or 3 very small, flat, pointed teeth. 
Lower part of the whole mandible well-developed. 
Maxilla (PI. XXIII, fig. 9) with a distinct notch behind the two upper spines, a few short 
hairs being disposed at the base of the notch. Between the notch and the two lower spines, 
the free edge bears only 2 or 3 spines; where there are three spines the first after the notch is 
represented by a pair. The upper two spines are longer, the others hardly differ in size. The 
shape of the maxilla is ‘triangular, its upper margin strongly bowed; the apodeme is long, as 
long as the maxilla itself, the spines included. 
Outer maxillae (Pl. XXIII, fig. 10) have the outer lobe short and broad, and the 
hairs on the surface and at the free extremity not very numerous. The tuft formed by them on 
the extremity is not very dense. The inner lobe has the surface that is directed to the 
interior rounded, and covered with several stronger and feathered hairs, part of which are 
directed towards the basis of the maxilla. The outer maxillae, like the other parts of the 
mouth, show great resemblance to the corresponding parts of 4. cadceolus and other species of 
the section. | 
Cirri. First pair: branches unequal, with 5 to 6, and 9 to 10 segments. Segments 
not strongly protuberant, those of longer ramus somewhat more so than those of shorter ramus. 
Second pair: 7 and 8 segments respectively in the two rami; distinctly developed tufts 
of hairs disposed on the protuberant parts of the segments. 
Third pair: with 8, and 9 to 10 segments respectively. Groups of hairs less-developed 
than on cirri of 2™¢ pair, standing off in all directions and forming no distinct tufts. 
Fourth pair: with 14 and 16 segments respectively in the two rami. . 
Fifth pair: with 15 and 17 segments respectively. 
Sixth pair: with 17 to 18, and 18 to 19 segments. Three pairs of spines on the inner 
face of the segments (Pl. XXIII, fig. 11); in a very few cases only, a trace of a fourth pair 
could be made out. On the outer face of each segment and near the extremity, a few spines 
are seen, one of which is much longer than the others, and exceeds the length of the segments. 
Penis: long in the one, unusually long in the other specimen, tapering towards the 
extremity; very few hairs scattered over its surface. 
This interesting species of 4alanus lives attached to the branches of an Alcyonarian, 
which Nurrinc has determined as Acanthogorgia truncata Studer. 
It was collected at: 
Stat. 310. February 12, 1900. Lat. 8° 30’S., Long. 119°7’.5 E. Flores-Sea. Depth 73 m. Bottom: 
sand with few pieces of dead coral. 
General Remarks. This species shows relationship to B. xavicu/a in some respects at 
least. It forms a very natural and at the same time characteristic group with the other species 
of the same section. 
A small specimen of a Lalanus collected by the Siboga at Station 260, belongs, 
probably, to the same species. It was found attached to a reddish-brown stick, its shape 
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