1906.] NATURAL SCIENCES OF PHILADELPHIA. 253 



Townsend, Washington, 16-31 fathoms, green mud, sand and broken 

 shells; 4,247, Prince of Wales Island, 89-114 fathoms, green mud with 

 sand and broken shells; 4,274 (cotypes), Kadiak Island, 35-41 fathoms, 

 green mud and fine sand. 

 Samytha bioculata sp. nov. Plate XII, figs. 52, 53. 



The anterior prostomial lobe is quadrate, broader than long, its 

 anterior border wider than the posterior, slightly concave and its 

 lateral angles somewhat produced. Immediately behind and separ- 

 ated from it by a distinct transverse furrow is a second small quadrate 

 lobe, with a rather prominent eye or close aggregation of several 

 pigment specks at each antero-lateral angle. Behind this lobe the 

 peristomium forms a broad, smooth, slightly convex area reaching to 

 the branchiae. Ventrally there is a very broad truncate under lip 

 with a glandular margin. In the two known specimens only four to 

 SIX very short clavate tentacles exist on each side. 



The considerably enlarged peristomium projects ventrally as a 

 broad lobe enveloping the lower lip an^l is marked by a narrow trans- 

 verse line of gland cells. Elsewhere it is a simple smooth convex ring. 

 The second somite is about two-thirds as long and marked by a broader 

 glandular half-ring. The third (first setigerous) somite is very short, 

 but succeeding ones increase in length rapidly and by about VIII equal 

 the peristomium. All of the thoracic segments, of which there are 

 nineteen, the last seventeen of which are setigerous, are somewhat 

 muscularly thickened on the ventral half and provided with a narrow 

 presetal half-girdle of glands. The entire dorsum between the setse 

 tufts is thin-walled and smooth throughout. 



Fourteen segments in the type and larger specimen, and thirteen in 

 the smaller cotype, form the abdomen. In the former this region 

 comprises about one-third of the entire length ; in the cotype not more 

 than one-fourth. Owing to the projection of the parapodia from the 

 angles this region is decidedly quadrate, but somewhat arched dorsally 

 and marked ventrally by a narrow neural groove. The somites dimin- 

 ish regularly in all dimensions from before backward and the entire 

 region tapers to the pygidium, which forms a ring surrounding the large 

 anus and bears a pair of slender, prominently projecting cirri about 

 equal to half the diameter of the body at the posterior end. 



The four pairs of branchiae are so much crowded antero-posteriorly 

 that they appear to form a single series extending quite across the 

 dorsal area of II and III., Closer study shows that two are anterior 

 and slightly more lateral and two posterior and more median. They 

 are all similar, slightly flattened, slender and elongated, their length. 



