PHYLLODOCE FAKARAVANA. 109 



widest a little behind the anterior corners. The tentacles project laterally 

 from the anterior median convex lobe, extending directly ectad and nearly 

 attaining the outer edge of the prostomium on each side. The tentacles of 

 each side are attached close together and nearly in the same vertical line. The 

 lower ones are a little farther apart than the upper ones. They are of the usual 

 conical shape. The eyes are of good size. They appear to be somewhat ellip- 

 tic with the longer axis transverse. Each is separated from the extreme caudal 

 border by about its diameter, which is very nearly one sixth the total length of 

 the prostomium. The eye is much closer to the caudolateral border. Eyes 

 separated from each other by a space about equal to three sevenths the width 

 of prostomium. The nuchal organ on each side appears as a rounded prominence 

 between the extreme lateral point of the prostomium and the base of the first 

 tentacular cirrus. (Plate 16, fig. 7). 



The first three somites are free from each other and from the prostomium, 

 with the first incomplete dorsally. Each first tentacular cirrus (neurocirrus) 

 reaches to somite IX or X. Each dorsal tentacular cirrus (notocirrus) on the 

 second somite reaches to somite XIX, while the corresponding ventral tentacular 

 cirri reach only to soroites IX or X. Each tentacular cirrus (notocirrus) of the 

 third somite reaches to somite XV or to one adjacent to it. 



The somites are short and closely crowded. They increase gradually in 

 width from the first to the twentieth, from where they decrease decidedly 

 caudad. The twentieth and contiguous somites are nine or ten times wider 

 than long but in the middle region they are only three times as wide as long, 

 with the actual length greater than in the anterior somites. The dorsum 

 throughout is evenly and moderately convex. The venter is flat, with a neural 

 furrow wide and deep anteriorly but much less pronounced posteriorly. 



The parapodia are uniramous and strictly lateral in position. They are 

 especially large, in depth not fully equalling the vertical diameter of the body 

 in the anterior region, though nearly or quite doing so posteriorly. In length 

 in the anterior region clearly less than half the width of the somite. On the 

 first setigerous somite (somite III) the notocirrus is developed as a tentacular 

 cirrus as above noted. The corresponding neurocirrus is fohaceous though 

 small, its outer edge nearly straight, the ends rounded. The second setigerous 

 somite has each neurocirrus similar to the preceding one, but the notocirrus is 

 also fohaceous, small in size. (Plate 16, fig. 8). The notocirrus of the third 

 setigerous somite is much larger than that of the preceding one, but also decid- 

 edly smaller than that of the succeeding one which is essentially of the size 



