NO. 6.] ACCOUNT OF THE SPECIES. 61 



carries in front simple bristles of somewhat unequal length, and scattered, 

 rather small, sensory appendages. 



The posterior antennae (fig. 4) have the outer ramus about twice as long 

 as the inner, and composed of 7 joints, the 2nd and last of which are the 

 largest, with 4 very short articulations between them. The ramus carries 9 

 long plumose setae, 3 of which issue from the tip. 



The mandibles (fig. 5) are rather strong, with the masticatory part con- 

 siderably expanded. Of the cutting teeth, the outermost is the largest, and, 

 claw-shaped; the 2 succeeding ones are likewise rather large and bidentate 

 at the tip, whereas the others are rather small and closely crowded together. 

 The palp is scarcely more than half the length of the body of the mandible, 

 and has the 2 rami of equal size, the basal part being quadrangular in form, 

 and carrying, inside, 3 ciliated bristles. 



The maxillae (fig. 6) have the masticatory lobe of moderate size and 

 clothed with about 12 denticulated spines. The vibratory plate is well developed, 

 carrying 8 plumose setae, of which the middle ones are very much prolonged. 

 On the outer part of the maxilla, or the palp, the median lobe, constituting 

 the distal part of the basal joint together with the inner ramus, is unusually 

 prolonged, and the setae issuing from the end of this lobe are very densely 

 crowded together in a brush-like manner. The outermost lobe, constituting 

 the outer ramus, is comparatively small, and is fringed with 10 curved setae. 



The anterior maxillipeds (fig. 7) are short and thick, with the 5 digiti- 

 form lobes closely crowded together, and clothed with coarsely ciliated setae 

 of moderate length. On each of the 2 outermost lobes, one of the setae 

 assumes the character of a claw-like spine. The setae issuing from the 2 

 terminal joints are rather small, though distinctly ciliated. 



The posterior maxillipeds (PI. XVI, fig. 4) exhibit a rather characteristic 

 appearance, being very slender and elongated, more than 3 times as long as 

 the anterior. The 1st basal joint is oblong quadrangular in form, and exhibits 

 in front 3 successive slight prominences, clothed with a restricted number of 

 short setae. The 2nd basal joint is fully twice as long as the 1st, and very 

 narrow, almost linear in form. Its anterior edge is "finely ciliated in its 

 proximal part, and somewhat beyond the middle it carries 3 unequal setae. The 

 terminal part is comparatively short, scarcely Vs the length of the 2nd basal 

 joint, and is more or less strongly incurved. It is composed of 5 joints, the 



