304 THE ANNELIDA. POL YCHAETA. 



The succeeding branchiae continue of this form and of nearly the same pro- 

 portions, in no observed case exceeding two thirds the length of the cirrus, in 

 the posterior region decreasing in length and finally becoming almost rudi- 

 mentary, but continuing to be present very nearly to the last somite. 



The maxillae are well chitinized and are in large part dusky. The carriers 

 of maxillae I have a characteristic form, together forming a plate widest across 

 its anterior end and narrowing caudad in subtriangular form, but with a deep 

 median incision from the caudal end; each lateral margin is gently incurved 

 at the middle of its length; an elongate triangular area on the mesocephalic 

 portion of each piece is more elevated and is paler in color. Each blade is nar- 

 rowed a little in front of the caudal end, then widens again before more strongly 

 narrowing to the slender, gently curved, distal division, or fang. The right 

 piece of the maxiUae II bears nine teeth of nearly uniform size, but with the 

 proximal ones broader and more obtuse. The inner plate on the left side has 

 ten teeth, of which the ones at the caudal end of the series are lower and more 

 rounded, appearing like crenations, the most distal tooth not enlarged. The 

 outer left plate of the second maxillae bears also ten teeth which, beginning at 

 the caudal end as low, small crenulations, increase gradually distad; the most 

 distal tooth is much larger than the others and is separated by a wide space. 

 The right maxilla III bears eleven teeth in a well-curved series, the caudal one 

 being low and blunt, and those at the ectodistal end longer and acute; the left 

 plate has nine teeth also in a well-curved series. Each maxilla IV is a sub- 

 quadrate plate on which the distomesal angle is darkened and somewhat reflexed. 

 (Plate 52, fig. 3). In the mandibles of the types the masticatory plates are all 

 broken; they are hard, white, and foliate, but the exact form cannot be made 

 out. The stems are expanded at the anterior ends as supports for the masti- 

 catory plates, from where they narrow caudad ; they are long, curve outwards 

 near their middle, and then mesad at the caudal end where they approach each 

 other; they are darkened caudad to about the middle of theu- length, the poste- 

 rior half being whitish. (Plate 52, fig. 2). 



Neither of the type-specimens is complete, one being represented by two 

 fragments, the other by three, anterior and caudal ends being present in both 

 cases. In the two fragments representing the paratype there are thirty-one 

 (anterior) and thirty-nine (posterior) segments respectively, the fragments 

 in length measuring respectively 27 nmi. and 21 mm. The greatest width, 

 exclusive of the parapodia, is 4 mm. 



The general color is a dark, dusky brown, the appendages being somewhat 



