228 THE ANNELIDA POLYCHAETA. 



PSEUDONEREIS ATOPODON, Sp. nOV.^ 



Plate 35, fig. 3-5. 



Consisting of from eighty-eight to one hundred and five parapodia-bearing 

 somites. Length of type 85 mm. Greatest width, which is in the region of 

 the fifth somite, 3 mm., exclusive of the parapodia. One paratype has a width 

 of 4 mm. in this same region. Back of the region of greatest width the body 

 rapidly narrows and the dorsum becomes correspondingly lower. 



Prostomium as long as greatest width across base, or very nearly so. Pre- 

 ocular portion bulging laterad at base, where as wide or slightly wider than 

 width across anterior eyes; anteriorly widely and evenly semicircularly rounded. 

 Posterior eyes at caudal edge as usual; large and somewhat obUquely subelUp- 

 tic. Anterior eyes a httle farther apart than the posterior. Tentacles rather 

 stout at base, conical, distally slender; nearly contiguous at base; fully four fifths 

 or more as long as the prostomium and extending much beyond tips of the palpi. 

 Palpi relatively very thick but proportionately short; distal article abruptly 

 narrower than the first, but still relatively broad, distally subtruncate. 



Peristomium along median dorsal line but little more than half as long as 

 the prostomium; laterally four fifths as long. Tentacular cirri short. Pos- 

 terior dorsals reaching to the fifth parapodia-bearing somite; anterior dorsals 

 reaching the second; ventrals a httle shorter than the anterior dorsals, subequal 

 to each other. 



Parapodia all of moderate length. Both notopodial and neuropodial 

 setae occurring in all parapodia, excepting those of the first two pairs. In the 

 notopodia of the first two somites there is a single distally rounded lobe, from the 

 dorsal side of which arises a cirrus greatly exceeding it in length. In the caudal 

 region the dorsal lobe is more elongate and the cirrus arises almost directly from 

 its end, which appears as a slight rounded eminence at one side of the base of 

 the long and slenderly acuminate cirrus. In the second and succeeding segments 

 a second notopodial lobe is present between which and the cirriferous lobe the 

 setae arise. In the neuropodia throughout there are two lobes, a ventral one 

 bearing a cirrus much shorter than the dorsal one, in the anterior region a little 

 exceeding its lobe, but as usual becoming shorter caudad and a second stouter 

 setigerous lobe, the distal end of which may appear weakly bilobed. (Plate 35, 

 fig. 3j. 



' &Toiros, strange, and 65u)v, tooth. 



