95 



21022012. Between 2 and a .very small hair-tuft. Lateral hairs long, many single, 

 the others in multiple tufts. Two series of smaller tufts with one single or a few 

 hairs between the median and posterior tufts. 



Abdomen rather broad; lateral hairs on first two segments triple, double on 

 third to sixth; short hair-tufts at the base of the lateral hairs. On the dorsal side 

 of the segments three pair of tufts, one pair at the anterior and posterior border of 

 each segment, and a greater pair almost in the middle of the segment; this tuft 

 always consists of four hairs commonly arranged rectangularly to each other; the 

 other hair-tufts mainly triple or with four hairs, the arrangement of these hair- 

 tufts is very regular, the tufts forming three series over the dorsal surface of the 

 abdomen; on the ventral side only the median tufts present, those of the anterior 

 and posterior border being absent. Seventh segment with some more irregular di- 

 stribution of the tufts and without lateral hairs. Hairs of eighth segment in com- 

 mon arrangement. Lateral comb consisting of about twelve scales arranged in an 

 arcuate, single row, each scale having a rather narrow base and terminated by a 

 long strong spine ; on both sides fringed with a long series of weaker ones or very 

 fine hairs. Air-tube moderate, almost one and a half times as long as eighth seg- 

 ment, tapering at the apex, three times longer than broad: pecten short, with 10 

 12 teeth, every tooth broad, flattened, yellowish-brown with white apices; at the 

 base furnished with a series of dark, short spines; a single hair-tuft of five hairs 

 at some distance from the pecten and a single hair on the opposite side. Anal seg- 

 ment very short, a little \vider than long; the plate small, not quite encircling the 

 whole segment; dorsal tuft consisting of about eight to ten hairs of rather different 

 length. The ventral brush very remarkable, only feebly developed, consisting of but 

 seven rays, each ray carrying two or three hairs; before the brush two or three 

 free tufts; lateral tuft highly developed with three strong hairs. Anal gills of un- 

 equal size; the two large ones almost twice as long as the anal segment, the two 

 others only half as long, all broad, flattened, obtuse. 



Lateral tufts of labrum short but dense; the inner part with a little crown of 

 comb-hairs; palatum well-developed, covered with soft hairs. Mandible qua- 



drangular, two stout spines before the collar, a row of cilia from a collar, about 

 seven to ten spines from inner margin; dentition four strong teeth, preceded by 

 two serrated filaments, one much stronger than the other; a strong spine before 

 these filaments. Four hairs within; process below slightly furcate, with strong hair- 

 tufts; a group of long hairs at base. Maxillae narrowly elongate, tips conically 

 rounded, divided by a suture; at the apex an elegant large brush of long hairs; a 

 seta near the apex beyond the brush. Along the suture, between it and the inner 

 margin, a coarse coating of short, soft hairs. No spines at margin, but the whole 

 space between it and the coating of short soft hairs covered with short, strong 

 spines, especially in the part nearest to the apex; palpus well-developed with five 

 small apical digits. Mentum triangular, straight sides, a large central tooth and from 

 ten to eleven small teeth on each side. The whole body pilose. 



