ART. 15 POLYCHAETOUS ANNELIDS FROM ORIENT TREADWELL. 15 



two remaining ones are about equal in length and reach as far as 

 the anterior border of somite 6. In the type the pharynx is par- 

 tially expanded. On either side it carries six longitudinal rows of 

 semicircular plates, about eight in a row, each plate colored dark 

 brown on its outer margin. 



The dorsal cirri are all prominent, asymmetrically lanceolate in 

 outline, attached to a broad cirrophore. Throughout they contain 

 radiating pigmented lines, which in the anterior regions of the body 

 make them much darker than the reddish much arched, iridescent 

 dorsal body-surface. (Fig. 26.) This distinction is intensified 

 posteriorly where the pigment becomes much darker. 



The setal lobe of the parapodium has a rounded posterior and 

 longer, asymmetrically cleft anterior lip, with a single acicula and 

 a vertical row of setae coming to the surface between the lips. The 

 ventral cirrus is about as long as the setal lobe and lies posterior to 

 it, which posteriorly it nearly covers. In the figure it is represented 

 as pushed ventrally away from its usual position. The setae are 

 compound, 20 to 25 in number in a vertical row, the basal joint hav- 

 ing a bunch of stiff spines and the long slender terminal joint carries 

 on its concave surface a row of rounded denticulations, (Fig. 27.) 



In the type the posterior end is missing. In a second specimen of 

 about the same size as the type, there is a gradual decrease in body 

 width until at the posterior end it is not more than 0.25 mm. in 

 diameter, the dorsal and ventral cirri being relatively much larger 

 than they are farther forward. There is a single pair of dark 

 brown anal cirri, as long as the last 4 or 5 somites. 



Having pharyngeal papillae arranged in rows, this species would 

 be classed by some taxonomists as Atialtides rather than Phyllodoce. 

 This structural character seems to me hardly of generic value. 



Collected at Pango Pango, Samoa. The type is Cat. No. 19145 

 in the U.S.N.M. 



PHYLLODOCE TENERA Grube 



Phyllodoce tenera Grube, 1878, p. 97. 



Grube gives no figures for this species, and identification is rather 

 difficult from his description but I have doubtfully identified these 

 as belonging here. The animals are noteworthy from the large 

 size of the eyes and the relatively narrow lanceolate dorsal cirri, 

 especially those toward the posterior end of the body. The tentacu- 

 lar cirri are shorter than in Grube's description. 



There is a considerable variation in coloration. Some are en- 

 tirely colorless, while others have a uniformly distributed dark brown 

 tint over the whole anterior region. In general the cirri are dark 

 brown in color, but there seems to be no uniformity in this respect- 



Grube's specimens were from the Philippines, mine were collected 

 at Pango Pango, Samoa. 



