1909.] NATURAL SCIENCES OF PHILADELPHIA. 237 



end, the longer ones about equal to total width of worm and with about 

 20 short articles, the shorter two-thirds as long with about 15 articles. 



Acicula three, tapered, with the ends blunt, slightly flattened and 

 just perceptibly enlarged. Setae few (about 9-11), all subacicular, 

 colorless, with rather strongly curved steins acutely beveled at the 

 end, smooth, with a slight shoulder for attachment of the appendage 

 (Plate VII, figs. 1 and 2); length of appendages varying from one 

 and one-third times (on posterior parapodia) to more than twice (on 

 anterior parapodia) the distal thickness of the stems, their distal ends 

 hooked and conspicuously bifid, the teeth being much more widely 

 separated on posterior setse, on which also the marginal fringe is much 

 less developed. 



The single incomplete specimen was taken at "point above Third 

 Beach," vicinity of Monterey Bay, July 12, 1904. 



PHYLLODOCID^E. 



Phyllodooe medipapillata sp. nov. (Plate VII, figs. 3 and 4). 



The two examples upon which this species is based differ greatly 

 in appearance and degree of contraction, one being robust, the other 

 very slender. Length of type 100 mm., maximum width of body 

 1.8 mm., total width including parapodia 3.5 mm.; number of seg- 

 ments 201. Length of cotype 170 mm., width of body 3.5, total width 

 including parapodia 8 mm. ; number of segments 240. 



Prostomium rather thick, depressed, broad, slightly cordate behind; 

 about as wide as long, the greatest breadth at the eyes about one- 

 third of the length from the posterior end, the sides very strongly 

 convex at this point; anterior border broadly rounded, projecting 

 slightly beyond tentacles. Eyes circular, their diameter about one- 

 eighth to one-tenth width of prostomium, at the widest part of which 

 they are situated, separated by about one-half its width. The tentacles, 

 which arise from a shallow annular depression, short conical, diverging 

 equally in both directions, about as long as one-third width of prosto- 

 mium. Nuchal organs everted as prominent knobs between sides of 

 prostomium and peristomium just below e}^es. A minute nuchal 

 tubercle, about one-third diameter of nuchal organs, occupies the 

 posterior emargination of the prostomium. 



Peristomium and somite II coalesced, achaetous, nearly concealed 

 above by the prostomial lobes, between which the nuchal tubercle 

 projects; below forming a smooth, somewhat swollen lip. Except in 

 the character of its parapodia III is similar to succeeding segments. 

 Tentacular cirri all short, with distinct cirrophores and rather stout 



