NO. 2 HARTMAN : QUANTITATIVE SURVEY 195 



Family SYLLIDAE 

 Genus Eusyllis Malmgren, 1867 



Eusyllis transecta, new species 



(Plate 2) 

 Collection: Sta. 2006 ( 12, TYPE). 



The body is short, thick and fragile; it measures 6.1 mm long by 

 0.8 mm wide between segments 10-20, or at its widest part; it has 46 

 segments. The dorsum (preserved) is crossed by black bars, at segmental 

 grooves. The prostomium ( Fig. 1 ) is subquadrate, wider than long, has 

 four small eyes in trapezoidal arrangement, behind the insertion of the 

 paired antennae ; the anterior, slightly larger pair are wider apart than 

 the posterior pair. The median antenna is much the longest, inserted 

 behind the paired antennae; its length is about 2.5 times that of the 

 paired ones, which are about as long as the second dorsal cirri. Antennae, 

 dorsal and tentacular cirri appear smooth, but show weak annulations 

 under magnification. 



Palpi are short, broad ; the two are fused at the base ; each is directed 

 forward for a length equal to that of the prostomium. The retracted 

 proboscis and proventriculus extend through segments 1 to 5 and 6 to 1 1 

 respectively. The dissected pharynx is cylindrical ; it terminates anteriorly 

 in a serrated margin (Fig. 2) ; its dorsal arc is slightly crenulated and 

 the ventral arc has 18 pointed teeth which increase in length midventrally. 

 A large, middorsal tooth (Fig. 3) is embedded in the pharyngeal tissue 

 some distance beyond the anterior edge (Fig. 3, seen in lateral view). 



The first segment, or peristomium, slightly overlaps the prostomium 

 medially ; its tentacular cirri are long, with the dorsal pair the longest, 

 exceeded only in length by the median prostomial antenna. The second 

 segment is the first parapodial one ; its ventral cirri are cirriform, and 

 farther back they are short, triangular. All parapodia (Fig. 4) are lateral, 

 have long, pseudoarticulate dorsal cirri which diminish in length posteri- 

 orly, or alternate long and short in anterior segments. Ventral cirri, from 

 the second, are short, triangular, exceeded in length by the acicular lobes. 

 Anterior and median parapodia have setae of two kinds ; the superior- 

 most, supra-acicular one is long, slender, distally pointed and laterally 

 slightly dentate (Fig. 5). Subacicular setae number 9 to 12 in a fascicle; 

 each is composite, distally falcate; anterior ones (Fig. 6) have a slightly 

 longer appendage than posterior ones, and are dentate along the cutting 

 edge ; posterior setae have a shaft distally dentate and the appendage is 

 smooth (Fig. 7). Acicula occur singly in a ramus; each is straight and 



