133 
With regard to the structure of the animal’s body, the following may be of interest: 
Mouth flattened, at a considerable distance from the adductor scutorum muscle; crest 
of labrum with a row of over thirty small conical teeth; palpi rather narrow, elongately 
conical, slightly curved, with the tip rounded; numerous short hairs on the surface and a few 
longer ones, distinctly curved at and near the extremity, along the outer margins. 
Mandible (Pl. XIII, fig. 1) with three teeth and the inferior angle narrow and _pec- 
tinated at the extremity. The anterior or upper margin of the inferior angle is furnished with 
a row of eight teeth, growing stouter from above downwards. Distance between tips of first 
and second teeth between one and a half and twice the distance between second and third. 
Maxilla (Pl. XIII, fig. 2) with a distinct notch beneath the three upper spines. The 
upper margin of the step-formed projection long, bearing five short spines. The edge of the 
same projection relatively short and bearing about seven longer and stouter spines, with a few 
shorter ones near the inferior angle. 
Outer maxillae (Pl. XIII, fig. 3) with the inner surface indistinctly bilobed, the 
outer surface rounded and clothed with numerous hairs of which the inferior ones are the longest. 
Cirrus of the first pair attached near to each side of the mouth, with nearly equal 
rami of 14 segments thickly clothed with spines. 
Cirrus of the second pair with very unequal rami of 12 and 26 segments, the longer 
more than twice as long as the shorter ramus. All segments thickly clothed with spines; the 
segments of the shorter ramus broader, those of the longer ramus, especially the more distal 
ones, more elongated. 
Rami of cirrus of the third pair slightly unequal: the shorter with 32, the longer 
with 34 segments. The lower segments have the anterior margin furnished with three pairs of 
spines, and the lateral face bears numerous spines as well as a group of two or three on 
the posterior margin near the extremity of the segment; the middle segments have the same 
pairs along the anterior margin, a row of spines along the upper margin, and also bear 
spines near the extremity of the segment at the posterior margin; the last segments have the 
spines only near the extremity and those along the anterior margin. 
Rami of cirrus of the fourth pair equal, with 37—38 segments. Each segment has 3 
pairs of spines along the anterior margin and a couple of bristles at the posterior near the 
extremity of the segment. The lower segments show a few very delicate hairs distributed over 
the lateral faces. ; 
Rami of cirrus of the fifth pair equal, with 4o—41 segments; hardly any bristles on 
the lateral faces of the segments, those along the anterior margin and at the extremity of 
the segments on the posterior margin as usual. 
Rami of cirrus of the sixth pair equal, with 44 segments; spines as on the cirri of 
the fifth pair. 
Of the spines along the anterior margin of the cirri of the 3'1—6' pair those forming 
the second and third pair are very long, those of the first or lowest pair, on the contrary, 
are as a rule short and very delicate. 
Caudal appendage unusually short, having about half the length of the first 
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