NO. 5.] ACCOUNT OF THE SPECIES. 97 



narrow cylindric and unarmed, the last, as usual, unequally bilobed, and 

 carrying on the tip 10 slender setse arranged in a flabelliform manner. The 

 outer ramus is comparatively small, scarcely more than half as long as the 

 inner, and is attached to the basal part far from its extremity. It is com- 

 posed of only 5 distinctly defined joints, the 1st of which is nearly as long as 

 the other 4 combined, the last about half as long. On the tip, this ramus 

 carries 3 very much elongated setse, and along the inner side 5 much 

 shorter setae. 



The mandibles (fig. 3. bis) are rather feeble, with the masticatory part 

 narrowly produced, and terminating in only 2 unguiform cutting teeth. The 

 palp exhibits all the chief parts distinctly developed, and is considerably 

 larger than the body of the mandible. Its basal part, however, is rather 

 narrow and quite naked, being obliquely produced at the inner corner, so 

 that the inner ramus projects considerably beyond the outer. The 1st joint 

 of the inner ramus is imperfectly defined from the basal part, and carries 



2 setae inside; the last joint is provided at the tip with 6 slender setae 

 arranged in a flabelliform manner. The outer ramus exhibits the ^ usual 

 structure, being divided into 5 articulations, carrying long plumose setae. 



The maxillae (fig. 6) have likewise all the chief parts distinctly developed. 

 The masticatory lobe is rather narrow, and carries a limited number of 

 cihated spines. The vibratory plate is well developed, and provided with 6 

 densely plumose setae. Between the masticatory lobe and the palp, a small 

 lobe carrying a single seta occurs. The basal part of the palp is provided 

 inside with 4 setae, of which the proximal one issues at some distance from the 

 others, being attached to a small knob-like projection, which may answer to 

 the 2nd intermediate lobe. The 2 rami are both well defined from the basal 

 part, but are of very different size, the inner one being very small, and pro- 

 vided with only 3 apical setae, whereas the outer is unusually large, forming 

 a subcylindric piece projecting far beyond the inner ramus, and carrying on 

 the somewhat dilated and obliquely truncated extremity about 6 setae, the 2 

 innermost of which are very much prolonged and densely plumose in their 

 distal part. 



The anterior maxillipeds (fig. 7) somewhat resemble those in Augaptilus, 

 as described above, but differ in the fact of the basal part being divided into 



3 distinctly defined joints of about equal size. The 5 digitiform lobes are 



