NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 73 



and the broadly exposed dorsum. The ventrum is marked with a deep, 

 median neural groove, and is almost uniformly covered with filiform 

 papillae, producing a furry appearance. The papillae are continued 

 laterally over the surface of the parapodia, but are for the most part 

 shorter and smaller. 



The prostomium is largely concealed by the stout median cerato- 

 phore and the peristomial segment. It is narrowest anteriorly (pi. 19, 

 fig. 238). The 4 eyes are black, the anterior pair large, approximately 

 circular, directed anteroventrally, their edge visible in dorsal view of 

 the prostomium. Posterior eyes are much smaller, nearly circular, in- 

 serted on the prostomial lobe in line with, but away from, the lateral 

 bases of the median antenna. Median antennal base is large, bulbous, 

 projecting anteroventrally, provided with a slender, tapering antenna 

 that extends distally about as far as the setae of the first segment (pi. 

 19, fig. 238). 



Elytra are imbricated, but do not nearly overlap medially, and leave 

 uncovered the parapodia. They are broad, somewhat triangular anteri- 

 orly (pi. 19, fig. 243) and gradually become subquadrate posteriorly 

 (pi. 19, fig. 240). None are incised. The marginal fringe is close, long, 

 where present, but absent along the anterior margin where the elytrum 

 is overlapped by the preceding one. It extends distally not nearly as far 

 as the notopodial setae. In addition, there are knob-like lobes at the 

 inner and posterior margins, from which small capitate papillae arise 

 (pi. 19, fig. 243). The dorsal surface of the elytra is overlain with 

 many long papillae, similar to those at the margin, but mostly shorter. 



Parapodia are subbiramous, the notopodium short, blunt, rising 

 from the dorsal face of the neuropodium (pi. 19, fig. 239) and pro- 

 vided with a large, spreading fascicle of many (200 or more) very fine, 

 hair-like, serrated setae that extend upward, laterally and ventrally, 

 more or less concealing the other parapodial structures. The noto- 

 aciculum projects slightly from its lobe, but is not visible unless the 

 notopodial setae are lifted away. 



The neuropodium is a stout lobe, covered over with elongate pa- 

 pillae, from which the stout aciculum projects a short distance. It is 

 provided with stout, amber-colored, composite setae. The superiormost 

 setae have a long, spinose shaft (pi. 19, figs. 234, 235) (for which the 

 species is named), and long falcate appendage, usually without, but 

 sometimes with, a small accessoiy tooth. Median neuropodial setae are 

 about as heavy as, or heavier than, the dorsalmost. The shaft is nearly 



