58 THE VOYAGE OF II. M.S. CHALLENGER. 



in Alepas cornuta, Darwin, the orifice appears more sinuous than it really is, from the 

 convexity of the part of the capitulum immediately beneath the orifice. 



Peduncle almosl as long as the capitulum, the one insensibly passing into the other; 

 the peduncle, however, is much narrower than the capitulum, and is furnished with a 

 swelling towards its upper end. Colour and red spots as in the capitulum. 



Size. The largesl specimen, including the peduncle, was 13 - 5 mm. in length, and 

 5 mm. across the capitulum. 



Filamentary appendages. — One on each side, not very short, tapering and pointed; 

 seated on the posterior margin of the swelling beneath the basal articulation of the 

 first cirrus (PI. III. fig. 4). 



Month. — Labywm (PI. VII. fig. 10) not very prominent or bullate, crest with a row of 

 lilunt bead-like teeth, and externally to these there are no bristles. Palpi triangular, 

 by no means so narrow as those of Alepas cornuta, thickly closed with doubly serrated 

 bristles along their inner margins. Mandibles (PI. III. fig. 2) with three teeth, the third 

 has a toothed edge as in Alepas minuta and in Conchoderrna ; inferior angle rather stout 

 and also furnished with teeth. Both sides covered with bristles, strongly projecting over 

 the hinder margin of the inferior angle. Maxilla' (PI. III. fig. 3). — Upper extremity 

 with one very strong and two rather smaller spines. Beneath these there is a somewhat 

 indistinct notch, in which four or five small spines are seated. Inferior part not very 

 prominent, with numerous doubly arrayed spines, two of which are much stronger than 

 the others. Steps not distinct. Outer Maxillce (PL VII. fig. 11) with a semicircular 

 outline ; serrated bristles in front indistinctly divided into two groups. 



Cirri not very long, slightly curled towards the extremity. Pedicels in proportion 

 long, rami rather short. Segments short, inconsiderably produced towards the extre- 

 mity. First cirrus (PI. III. fig. 4) close to the second, top of its pedicel on a level with 

 the top of the pedicel of the second cirrus. Rami not very short, more than three-quarters 

 of the length of those of the second cirrus, unequal, the anterior ramus being a little longer 

 than the posterior ramus ; the posterior contains seven, the anterior eight not very 

 distinct segments. Their form is nearly quadrangular and not protuberant. The 

 anterior and longer ramus is a little thicker than the other. Spines very numerous 

 on the outer surface, and placed on the margins of the segments only at the inner side. 

 Those of the two last segments are a little shorter and more robust. Second cirrus with 

 almost equal rami of fourteen short segments. Pedicel long as in the other cirri. Bristles 

 forming rows at the outer margin of each segment, and forming tufts at the slightly pro- 

 tuberant anterior side of each segment, The sixth cirrus (PI. III. fig. 5) has also four- 

 teen segments in both rami; the rami are equal, and show the same arrangement of 

 the bristles as the second cirrus. The bristles at the hinder side of each segment are 

 longer than those placed at the front side. 



Caudal appendages (PI. III. fig. 5), very long and very slender; they reach as far 



