446 PROCEEDINGS OF THE ACADEMY OF [June, 



median tentacle distinctly smaller than inner laterals, its tip reaching 

 only to VIII, while the inner laterals reach to XI, its base constantly 

 only § that of inner laterals, of 6 narrow rings and terminal ^ not annu- 

 lated, while that of the inner lateral has 9 rings and a terminal smooth 

 portion ; outer laterals in the same transverse line with inner laterals, 

 occupying nearly the position in which eyes are ordinarily present, 

 usually perfect, short, reaching, when reflexed, to IV only, remark- 

 able for the great length of basal piece, which equals, or even exceeds 

 the style, and consists of 11 annulations, decreasing in size and dis- 

 tinctness toward the end; style short, relatively stout, undivided, 

 but sometimes bearing a terminal filament. 



The buccal ring is probably compounded of the peristomium and 

 the succeeding somite, the posterior bearing the tentacular cirri and 

 the anterior the so-called palpi with which it is connected; longer than 

 prostomium, ventral and lateral oral lobes prominent. Tentacular 

 cirri slender and rather long, reaching to the tips of the frontal tenta- 

 cles, bases with 2 or 3 obscure annuli but no distinct segments. 



First 4 setigerous somites sharply distinguished from the others by 

 their length, which causes the parapodia to stand widely apart instead 

 of being crowded, as well as by the length and slenderness of the cirri- 

 form processes of the parapodia ; first much the longest and anteriorly 

 the widest, the succeeding three becoming successively shorter and the 

 margins rounded, thus gradually approaching the typical form, which 

 is short, wide and depressed, -^dth dorsal and ventral surfaces nearly 

 flat. 



Anal segment prominent and somewhat funnelform, with 2 pairs of 

 crowded, long, slender caudal cirri, the more posterior equal to 13, the 

 other to 10 terminal somites. 



First 4 parapodia arise at a low level from the anterior ends of their 

 somites; except the first, which is directed shghtly forward, they pro- 

 ject almost straight laterad. Body of parapodia simple, relatively 

 slender, and about equalling length of somite to which it is attached; 

 bearing 3 long slender tapering cirri, the dorsal longest, the middle, 

 which continues the neuropodium as a postsetal process, next, and the 

 ventral shortest, the latter also attached nearest to base of parapo- 

 dium ; both dorsal and ventral cirri slightly constricted at base, then 

 a little swollen, then regularly tapering and slender. Fifth parapo- 

 dium more dorsad, the base and neuropodium smaller, ventral cirrus 

 reduced to a short, thick glandular lobe, its postsetal lobe shorter and 

 little cirriform; it bears the first branchia. On succeeding somites 

 the glandular area into which the ventral cirrus becomes converted 



