92 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.10 



Nothria stigmatis cirrata, new subspecies 

 Plate 11, Figs. 248-253 



Collections.— h?i Plata, Ecuador, Jan. 22, 1933 (1); 221-34 (1); 

 1048-40 (1). 



Length of a complete specimen, consisting of about 160 segments, is 

 3 1 mm. The dorsum is marked with a pattern similar to that of the stem 

 species. The prostomium is pale save for a dark crescent at the anterior 

 margin, immediately behind the frontal antennae. Eyespots, between the 

 bases of the outer and inner paired tentacles, consist on each side of a 

 rounded patch of 8 to 10 tiny dark specks. The occipital tentacles are 

 notably longer than in the stem form. The outer lateral ones have a 

 ceratophore consisting of 5 shorter rings and a longer distal one; the style 

 extends back to about the third or fourth setiger. The inner lateral ten- 

 tacles have a ceratophore about U^ times as long as those of the outer; 

 the styles extend back to about the tenth or eleventh setiger. The median 

 tentacle is a little shorter than the inner lateral ones. The peristomial 

 ring has the proportions of the stem form, but the cirri are longer and 

 extend a little beyond the front margin of the prostomium. 



The first and second setigerous rings are subequal in length, but 

 slightly longer than those following. The body is at first nearly cylindri- 

 cal but comes to be broader and somewhat depressed between the fifth to 

 tenth setiger. 



Ventral cirri are cirriform through 6 setigers. Anterior, abranchiate 

 parapodia (numbering 16 or 17) have long, slender dorsal cirri and 

 shorter postsetal lobes. The dorsal cirri tend to stand more or less erect 

 (pi. 11, figs. 252, 253). The first parapodia are a little thicker than the 

 second, but their dorsal cirri are a bit shorter. 



Branchiae are first present from the seventeenth setiger on the right 

 side and from the next one on the left. They are long, simple filaments, 

 present through a long region, but small, papillar by the twenty-fifth last 

 segment, and are absent from a short posterior end. Anal cirri consist of 

 2 very long, slender dorsal cirri, about as long as the 20 last segments, 

 and 2 very short ventral cirri. 



The proboscidial armature agrees reasonably with that of the stem 

 form. Mandibles are similarly long, slender; they are translucent save 

 for a distal, calcareous edge ; the 2 parts are united for a short distance 

 only (pi. 11, fig. 248). Maxillae are thin, translucent, save for dark 

 streaks at the sutures. The formula is about as follows : on the left side 

 maxilla I is falcate, II has 6 teeth. III has 7 teeth, IV has 6 teeth, and 

 V has a single tooth. On the right side maxilla I is falcate, II has 7 teeth, 



