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longitudinal group and the superior margin. The inner surface near the free extremity, and the 
inferior margin, are furnished with microscopical hairs or ciliae. The latter stand in distinct little 
groups or bushes, especially in the specimen from Strait Molo. 
. Mandible (PI. XIX, fig. 11): teeth 1 and 2 pointed, their extremities at somewhat 
greater distance from each other than those of 2 and 3. Teeth 2 and 3 distinctly double. 
Tooth 3 thick. Teeth 4 and 5 close together, rather thick. Inferior angle terminating in two 
small, pointed spines, or rudimentary teeth. In the specimen from Strait Molo, teeth 4 and 5 
are less distinctly developed, tooth 5 being confused with inferior angle. The latter bears no 
spines or rudimentary teeth. 
Maxilla (Pl. XIX, fig. 12 and 12*): Notch small. The inferior pair of longer spines 
situated on an indistinct step-like projection in the larger (older) specimen only. A group of 
smaller spines is situated on the edge behind the inferior pair of larger spines. Between the small 
notch and the inferior pair of spines 5 spines are arranged in a single row and alternately 
point with their extremities to one or the other side. 
Outer maxillae (Pl. XIX, fig. 13): Outer lobe broad at the basis, the exterior 
circumference regularly rounded, and the apex somewhat pointed. Hairs on distal part numerous 
and delicate; the row of hairs extending from the outer lobe to the inner one partly double, 
these hairs standing off horizontally. Hairs on inner lobe not numerous, but disposed in several 
rows; a group of short spine-like hairs under and behind the longer feathered ones. 
Cirri: First pair. Rami unequal of 7 to 9, and 14 segments. The three lower segments 
of the shorter ramus fused together. Middle segments distinctly protuberant, protuberances 
covered with dense bushes of hairs. Six inferior segments of longer ramus shorter than broad, 
segments 7—9 quadrate, and 10—14 longer than broad. In the specimen from Strait Molo, 
the lower segment of the shorter ramus consists of only two segments, the whole number being 
8 to 9 in, consequence. The longer ramus has three segments more: 17 in all. 
Second pair. Shorter ramus has 7 segments, the basal one consisting of three 
segments. Longer ramus has g segments. All the segments furnished with dense groups of 
spine-like hairs situated on rounded protuberances. In the specimen from Strait Molo the number 
of segments is 10 and 11; here the spine-like hairs are extremely numerous, feathered, and 
arranged very densely. 
Third pair. Number of segments 11 and 12, 11 in the shorter and 13 in the longer 
ramus in the specimen from Strait Molo. Bushes of hairs on the protuberances of the segments 
not so dense as on second cirrus. These protuberances (Pl. XIX, fig. 14) are furnished with quite 
a row of small recurved teeth, with the exception of only the last three segments in the shorter, 
and the last in the longer ramus. The teeth on the protuberances are partly recurved; about 
half of them are short and spine-like. 
Fourth pair. Dorsal margin of basal segment of one ramus furnished with a double 
row of short tooth-like spines, such spines being seen also on the dorsal margin near the 
extremity of the 2" segment. Inner face of 2"1—6'" segments furnished along and near the 
margin with numerous but small recurved teeth (PI. XIX, fig. 15) arranged in small groups along 
a longitudinal row of slightly stronger teeth; a few more of these are seen on 7th to 10‘ segments. 
is 
SIBOGA-EXPEDITIE XXXI4. =6 
