NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 81 



This is a slender, elongated species. The length of 150 anterior seg- 

 ments is about 65 mm ; the width in the branchial region is about 4 mm. 

 It is conspicuously characterized through its long anterior appendages. 

 The dorsum in an anterior region still retains pigment in some individ- 

 uals ; it consists, on each segment, of an anterior row of dark spots and a 

 posterior row which may be more or less broken. In some individuals 

 these rows are more distinct than in others and consist of a fine anterior 

 band and a darker, broader, posterior band. The occipital tentacles are 

 pale, but the bases of the cerataphores have long, dark streaks. 



The prostomium is rounded in front, semicircular in outline, with 

 dark spots near the front and a crescentic spot posterior to the insertion 

 of the frontal antennae. A pair of eyespots is visible between the bases of 

 inner and outer paired tentacles, but these are inconspicuous. Frontal an- 

 tennae are ovate. The occipital tentacles are moderate to long in length ; 

 the outer lateral ones have a cerataphore about half as long as that of 

 the inner laterals, with 3 shorter articles and a longer distal one; their 

 styles are short, about twice as long as (coll. 767-38), or longer than, 

 their ceratophore. The inner paired tentacles are longest, their cerato- 

 phore with 6 articles, the distal one about 2% times as long as the others. 

 Their style extends back to the sixth or as far as the twelfth setiger. The 

 median tentacle is similar to, but shorter than, the inner lateral one, 

 and extends back to the fourth or as far as the eleventh setiger. 



The first parapodia are not prolonged or are only slightly larger than 

 the second ones and are directed obliquely forward. They have a slender 

 dorsal cirrus about as long as the parapodium, a postsetal lobe slightly 

 shorter but thicker at the base, and a similar, though shorter, ventral 

 cirrus. The dorsal cirrus increases in length proceeding from setiger 2 

 (pi. 5, fig. 98) to 5; the postsetal lobe also gets longer and comes to be 

 about % as long as the segment is wide. Ventral cirri are cirriform (pi. 

 5, fig. 95) through 7 or 8 segments, but thick at the base; thereafter they 

 are padlike. The postsetal lobes are longest in setigers 3 to 7, where they 

 are 2y2 to 3 times as long as wide at their base; gradually they are shorter 

 farther back; by the twentieth setiger they are still pointed, equitriangu- 

 lar, but thereafter more or less rapidly diminish in size, but retain their 

 triangular form. 



The first few parapodia are provided with about 5 slender, yellow 

 notoacicula; in the neuropodium there are 3 thicker, yellow, geniculate 

 neuroacicula terminating in a long, projecting, acute tip; setae include 

 5 or 6 pseudocomposite, tridentate, hooded hooks in which the distal 

 fang is longest (pi. 5, fig. 94). All the setae resemble one another save 



