1906.] NATURAL SCIENCES OF PHILADELPHIA. 223 



There are about 10 supraacicular and 12 subacicular setae in all, but 

 fewer on the extreme anterior and posterior parapodia and, except 

 for the usual variations in relative length of the blade, all have the 

 form exhibited in fig. 8. The slender stem ends in an acutely oblique 

 enlargement with 7 to 9 nearly equal, closely appressed teeth on each 

 side. The blades are slender, flexible and very acute, with very fine 

 marginal fringe. 



In both specimens the color has faded to a nearly uniform olive with 

 some brown striations on the dorsal cirri. The type is a female filled 

 with eggs. These specimens were found among serpulid tubes taken 

 at the Quarantine Station dock near Port Townsend, Washington, on 

 June 27, 1903. 

 Pionosyllis magnifica sp. nov. Plate X, figs. 9-11. 



This large syllid is described from two specimens, one of which (the 

 type) measures 48 mm. long and nearly 2 mm. wide, exclusive of cirri 

 and setae, in the middle of the body. The form is much depressed,, 

 especially in the widened middle region, from which it tapers to the 

 very small head and pygidium. 



As just indicated the prostomium is small, its width little exceeding 

 three-fifths of the width of the second segment and one-fifth of the 

 maximum breadth of the body. It is depressed, somewhat quad- 

 rangular in form, widest anteriorly where the width is about double 

 the length. The somewhat flattened palpi project forward and some- 

 what downward and are very slightly connate at the base (fig. 9). 



All three of the cephalic cirri are decidedly slender and arise in a 

 transverse row from almost the extreme anterior margin of the prosto- 

 mium. In one specimen they are subequal and about three times the 

 length of the prostomium. In the other the median one is three and 

 one-half times, the lateral about twice the prostomial length. The 

 ends may be partly sloughed away. 



The eyes, though small, are very conspicuous and nearly black, the 

 anterior slightly the larger. Together they form a quadrate figure 

 conforming to the outline of the head and about two-thirds as large. 



Dorsally the peristomium is very short, but ventrally it projects as 

 a prominent lip surrounding the large mouth. A fragment of the 

 anterior end of an example of this species from Station 4,235 has the 

 proboscis protruded as a short bell-shaped structure, bearing ten 

 prominent papillae at the end and just behind them a conical, dorsal 

 median tooth which appears to be quite soft. On the roof of the 

 pharynx just behind the everted portion there appears to be, however, 

 a hardened, horny elliptical area. This specimen also has the eyes. 



