NO. 8 NEW POLYCHAETOUS ANNELIDS TREADWELL 7 



tentacle is lost ; those of the inner paired extend to somite lo, whereas 

 those of the outer paired are hardly more than one-fourth as long 

 as these. The frontal tentacles are broadly oval in outline, their bases 

 being in contact. The palps are large and extend down over the 

 mouth. 



On its anterior margin somite i is wider than the prostomium, 

 and this width reappears on the posterior margin. In the middle, 

 where the parapodia arise, it is very much wider than this, and the 

 parapodia extend almost to the anterior prostomial border. Each 

 jiarapodium carries a slender dorsal and a much heavier ventral cirrus, 

 the latter having a heavy basal section and a slender terminal one, the 

 two being of about equal length. Apparently there are three subequal 

 terminal parapodial lobes, but owing to imperfect preservation, it 

 is not possible to be certain. Each parapodium carries three stout 

 hooked setae. 



Somite 2 is a trifle wider than somite i and less than one third 

 as long, its anterior border being a trifle wider than its posterior. 

 The parapodia extend forward but to a much less extent than in 

 somite i. Somite 3 assumes a form characteristic of the remainder 

 of the body. Its width is about four times its length, and the lateral 

 margins are uniformly rounded except where they extend out into 

 the bases of the parapodia. In somite 3 the dorsal cirrus is prominent, 

 four or more times as long as the setal lobe. The ventral cirrus 

 is also prominent, but stouter than the dorsal. The fourth, fifth, sixth, 

 and seventh parapodia have large dorsal and ventral cirri, the dorsal 

 being longer than the ventral. After the seventh there is a diminu- 

 tion in length of the cirri, and in later somites, although they are 

 longer than the setal lobes, they are very slender. Gills are composed 

 of several filaments, and on the sixteenth parapodium there are six 

 of them, palmately arranged (fig. 18). 



Just dorsal to the insertion of the ventral cirrus, each parapodium 

 carries a tuft of heavy setae and two aciculae. The aciculae are bluntly 

 rounded and end just inside the surface. The setae are of two kinds : 

 heavy ones having stout terminal and subterminal teeth covered by a 

 hood (fig. 19), and slender bilimbate ones reaching as far as the end 

 of the dorsal cirrus. The hooks of the first parapodium are very 

 heavy and have a terminal and a much smaller subterminal tooth. 



Since only one specimen appeared in the collection, I did not think 

 it wise to mutilate it by removing the jaws for study and I have no 

 information concerning them. In the gill character this species seems 



