217 
surface, disposed somewhat more densely towards the distal extremity and along the inferior 
margin towards the rounded-off angle. The inner surface bears shorter curled hairs which form 
a longitudinal group almost parallel to upper margin. 
Mandible (Pl. XXII, fig. 6): distance between extremities of teeth 1 and 2 about 
as long as that between teeth 2 and 3. Tooth 4 small, hardly to be distinguished, tooth 5 
confluent with inferior angle, forming together a rudimentary knob. Part of mandible beneath 
3 tooth, small. 
Maxilla (Pl. XXII, fig. 7): edge straight, two long spines at upper end and two 
slightly longer ones at the lower extremity of the edge. Between the two pairs a shallow 
notch and 5 spines arranged in a single row are seen (fig. 7*). Between the bases of each two 
spines an extremely small interspace is regularly seen. 
Outer maxillae (Pl. XXII, fig. 8): outer lobe with nearly parallel and almost straight 
lateral margins, and with the summit obliquely truncated. Hairs scattered over large part of interior 
surface and many of them directed perpendicularly to longer axis of lobe. Inner lobe elongate, 
with numerous hairs which are relatively strong and more distinctly feathered than those of 
outer lobe. 
Citriskirst pair: rami very unequal, of 6 and 14 segments respectively. Segments of 
the shorter ramus short, with rounded angles, the last segment with very strong spines situated 
on its extremity. Longer ramus has the lower segments broad and very short, the distal ones 
are almost quadrate. 
Second pair: rami rather unequal, of 6 and g segments. A group of very strong spines 
is situated on the extremity of the last segment of each ramus. 
Third pair: rami nearly equal, of 8 and 9 segments, spine-like hairs on anterior face 
of several segments of longer ramus extremely minute; pedicels very elongated. The first or 
basal segment of the pedicel has a dense row of curved hairs along its posterior face. The 
thorax bears a curved row of such hairs in continuation of those on the pedicel. 
Fourth pair: second segment of the pedicel of each cirrus furnished with a row of 
about a dozen distinct teeth, which together form a saw-like longitudinal edge along the anterior 
face of the segment (Pl. XXII, fig. 9). The three lowest segments of the one ramus have a 
couple of such teeth, disposed on anterior face near the extremity of each segment. Number 
of segments in one of the rami 12, the other rami broken off. The middle segments bear two 
pairs of hairs on the anterior face; they are situated very close together and a large part of 
the anterior face of each segment is quite devoid of hairs in consequence. 
Sixth pair: like the other cirri, broken off; therefore, number of segments undecided. 
The middle segments of the cirrus (Pl. XXII, fig. 10) have two pairs of hairs only, the upper 
pair longer, the more inferior one very short and situated at a distance from the upper pair, 
equalling about one fifth the length of the anterior side of the segment. Hairs on the posterior 
face disposed near the extremity not very long, groups formed of few hairs only. 
Penis broken off, basal part rather broad; no sharp point is seen at the dorsal side 
near basis of penis. 
89 
SIBOGA-EXPEDITIE XXXI0. 25 
