Polychaeta 7 B 



The parapodia are rather short and subcylindrical, but a little compressed 

 anteroposteriorly. The neuropodia rise somewhat at the distal end above and 

 show the usual sub vertical setigerous groove across the end and above. The 

 notopodia are small elevations arising from the dorsum of the parapodia toward 

 the anterior side and distad of a cylindrical, finger-like process into which the 

 aciculum extends and the cirrophore. The notocirri are attached at the bases 

 of the parapodia above. The notocirrophore is large, a little narrowed distad, 

 and much exceeding the style in thickness. The latter is of moderate length, 

 expands toward distal end, and terminates in a slender, abruptly set-off filament. 

 Mesad of each cirrophore on the cirriferous segments is a subconical process 

 in line with the elytrophores than which it is smaller. The neurocirri in general 

 arise ventrally proximad of the middle, the position in the posterior region 

 becoming more toward the caudal side. The cirrophores are proportionately 

 very thick and distally truncate. The styles in general are abruptly narrower, 

 short, and very thickly subfusiform or ovoid, with abruptly thinner, filiform 

 tips short. (See PL I, fig. 2). The neurocirri of the first normal parapodia, 

 however, are much longer, attaining or exceeding the end of the parapodia 

 proper, and clavate in form proximad of the tip, being closely similar to the 

 notocirri. 



The notopodial setae are present, though reduced to very few in going 

 caudad. They are numerous on the first parapodia, on the second are fewer 

 while on those of the posterior region they are reduced to only one or two or 

 none. They are much shorter than the neuropodials. They are flat and curved, 

 sword-shaped, incised or bidentate at the tip, and scaled along one side. (PL II, 

 fig. 1.) The neuropodial setae, excepting those of the first parapodia, and some- 

 times in part of one or a few following, distally with moderately hastate heads 

 which are curved. (PL 2, fig. 3.) The neuropodial seta? of the first parapodia 

 are all bidentate at the tip and finely scaled along the convex edge of the head. 

 (PL II, fig. 2.) In the second parapodia the supraacicular group of setse remain 

 of this same character, though coarser and longer, while the subaciculars are 

 still coarser, with heads more strongly curved, the tips entire, and the edges 

 smooth excepting for a few weak serrations. (See PL II, fig. 3.) Farther caudad 

 both supraaciculars and subaciculars have the latter, essentially smooth, form 

 with entire tips. The notopodials in the first parapodia are not thinner, 

 though shorter, than the neuropodials but they are finer than the ordinary 

 neuropodials farther caudad. 



The elytra thin though moderately tough. They are subcircular in outline 

 and are attached midway between their centres and their ectal edges. Surface 

 smooth, appearing wholly to lack tubercles and cilia. '(P\. I, figs. 3, 4.) While 

 they overlap in the series along each side, those of the opposite sides do not 

 overlap mesally, thus leaving a middorsal naked stripe. They occur upon 

 somites II, IV, V, VII, IX, and similarly on alternate somites to XXIII; then 

 on somites XXVI, XXVIII, XXIX, XXXI, XXXIII, XXXV, etc., about 

 twenty-five or more pairs being present. 



LOCALITIES. Alaska: Grantley harbour: Teller. Station 206-c. July 30, 

 1913. Depth, 2-3 fathoms. Bottom, sandy. 



Alaska: Port Clarence bay. Station 20g. August 4, 1913. Same depth, etc. 



This species much resembles S. Jragilis (Baird), a form common on the 

 Pacific coast farther south. It is a rather more slender form with coarser setae. 

 The notopodials in general are much more numerous. The species may be 

 distinguished at once by the setae of the second parapodia, fragilis lacking the 

 special supraacicular group of apically bidentate neuropodials present in lia. 



Evarnella impar (Johnston). 



1839. Polynoe impar JOHNSTON, Ann. Nat. Hist., 2, p. 436, pi. 22, f. 3-9. 



1840. Lepidonotus impar OERSTED, Annul. Dan. Consp., p. 13. 

 . Lepidonotus impar GRUBE, Fam. AnneL, p. 36. 



