NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 57 



3. Neuropodial setae distally entire 4 



3. Neuropodial setae distally bifid .... STHENELAIS 



4. Neuropodial setae with smooth, blunt appendage, those in a 

 fascicle similar to one another, forming trim vertical series 

 STHENELANELLA 



4. Some neuropodial setae long, pointed, the appendage transversely 

 canaliculated LEANIRA 



Genus EUSIGALION Augener 



Prostomium subtrapezoidal, with 3 subequal antennae, including a 

 pair inserted near the anterior margin, and a median antenna posterior 

 to, or between, the eyes. Eyes 4, minute, disposed in a rectangle on the 

 dorsal side of the prostomium. Parapodial structures and elytra re- 

 sembling those in Sigalion Audouin and M. Edwards. 



Eusigalion has heretofore been known through a single species, E. 

 vazensis Augener (1918, p. 113) from the French Congo, Africa. Two 

 species are herewith added. 



Eusigalion spinosum, new species 

 Plate 11, Figs. 134-140; Plate 12, Figs. 146, 147 



Sigalion pourtalesii Treadwell, 1914, p. 183 (not Ehlers, 1887, p. 57). 



Collections.— \m-?>1, 780-38, 814-38, 876-38, 887-38, 888-38, 

 889-38 (Holotype), 891-38, 893-38, 895-38, 896-38, 897-38, 899-38, 

 Ace. 587, Ace. 590. About 45 specimens. 



Length 100 mm or over; number of segments 125 to 150. Pale to 

 white, the elytra translucent and more or less completely covering the 

 dorsum. Form depressed, subrectangular in cross section, tapering an- 

 teriorly from about the tenth segment to a truncate prostomium, and 

 posteriorly from the median region to a narrow posterior end. 



Prostomium trapezoidal in outline, about as broad as long, widest 

 at its anterior margin (pi. 11, fig. 135), with 4 small dark eye spots 

 on the dorsum near the middle, and 3 subequal antennae, a pair at the 

 anterior margin and a median posterior to the eye spots. Palpi long, 

 slender, white, smooth, tapering and extending posteriorly to about the 

 seventh setigerous segment, when laid back. 



Elytra are pale or white, translucent, smooth, slightly emarginate 

 at their anterior margin (pi. 11, fig. 134), and with a row of pinnately 

 branched filaments (pi. 11, fig. 139) at their outer lateral margin. 



