214 THE ANNELIDA POLYCHAETA. 



above with a median longitudinal furrow, which is rather deep. Posterior 

 eyes at extreme caudal edge of prostomium, the same distance apart as the 

 anterior ones, or very nearly so, transversely subelliptic. Tentacles narrowly 

 conical, separated at base by nearly theii- basal diameter, nearly equal in length 

 to the first joint of the palpi. Palpi prominent, about four fifths as long as the 

 prostomium, the proximal joint about three fifths as long as the prostomium; 

 apical piece abruptly narrower, roundly subconical. 



Peristomium along median dorsal line a little more than three fifths as long 

 as the prostomium; laterally longer than the prostomium. Tentacular cirri 

 short, the posterior dorsals reaching to the fourth metastomial somite; the 

 anterior dorsal reaching upon the first or scarcely to the second, and both ven- 

 trals not wholly attaining the first. The immediately succeeding segments are 

 much shorter than the peristomium. The parapodia are short and of nearly 

 the same length throughout. Both notopodial and neuropodial fascicles of 

 setae, excepting in the first two pairs, in which the notopodial setae are lacking. 

 In the parapodia of the first and second pairs, and of the third on one side, the 

 notopodium is a simple conical process which its cirrus about equals in length. 

 The neuropodium is divided into three lobes, a major ventral one of nearly the 

 same size as the notopodium, and two more slender, dorsal ones, the setae arising 

 between the two dorsal lobes, of which the anterior is the more slender, and 

 between the latter and the main or ventral lobe. In the succeeding parapodia 

 the structure of the neuropodium is similar, but the notopodial process becomes 

 trilobed, the more ventral lobes being more slender and all conicocylindrical, 

 distally well rounded. The anterior lobe is the most slender. The setae arise 

 caudad of this anterior lobe and between it and the main lobe. In the first 

 or most anterior parapodia, the parapodial lobes are very nearly equal in length. 

 Caudad the anterior lobe of the notopodium becomes shorter and shorter, and 

 finally practically disappears; at the same time the dorsal and more ventral 

 notopodial lobes become manifestly longer and proportionately more slender, 

 the cirrus upon the former elongating proportionately, and conspicuously exceed- 

 ing the dorsal hgula. Whereas in the first parapodia the ventral lobe of the 

 parapodium is stouter than the other two, caudad the upper lobes gradually 

 fuse at their bases and then farther distad form essentially a single setigerous 

 lobe much thicker than the ventral one, on which the cirrus becomes short, 

 slender, and inconspicuous. 



Acicula stout and black. Setae all compound. The setae of the anterior 

 parapodia are all alike, long and very slender, with the shafts of the usual struc- 



