NO. 1 hartman: polychaetous annelids 61 



Sthenelais fusca Johnson 

 Plate 13, Figs. 153-162 



Sthenelais fusca Johnson, 1897, pp. 185-186, pi. 9, figs. 60, 61, pi. 10, 

 fig. 64; 1901, p. 397; Moore, 1909, p. 242; Tread well, 1914, 

 pp. 183-184; Monro, 1933, p. 16. 



Collections.— 2^--iZ, 343-34, 745-37, ?770-38, 780-38, 907-38, Ace. 

 585. 1 1 specimens. 



Notopodial setae are disposed in a full, fan-like fascicle of longer, 

 finely serrated setae, and fewer, shorter, pectinated setae in the inferior 

 part of the fascicle. Neuropodia have superiorly (1) spinose setae (pi. 

 13, fig. 153) and (2) long-shafted composite setae (pi. 13, fig. 154) ; 

 medially (3) stout, falcigerous setae with short, bifid appendage (pi. 

 13, figs. 155 to 157), disposed in a semicircular whorl about the neuro- 

 aciculum, the arc open anteriorly (pi. 13, fig. 159) ; and inferiorly (4) 

 slender, pale composite setae with long appendage in a transverse series 

 of 6 to 10, ventral to the parapodial flange that borders the main setal 

 fascicle. This character is in sharp contrast to the condition in S. varia- 

 bilis colorata Monro (see page 63), 



The first elytra are broadly ellipsoid, smaller than those following; 

 the others are excavate at their anterior margin (pi. 13, figs. 160 to 

 162). There is a row of longer, filiform papillae marginally, and several 

 irregular rows of smaller, submarginal papillae (pi. 13, fig. 161). In 

 some individuals the surface of the elytra is closely covered with minute, 

 wart-like elevations (28-33, Ace. 585), in others the papillated area is 

 much less or almost lacking. Thus, in 343-34, an anterior portion is 

 smooth; in 745-37 and 780-37 (pi. 13, fig. 160) the papillae are limited 

 to an anterior area. Most of the elytral outlines examined are propor- 

 tionately less broad for their length than has been shown by Johnson 

 (1897, pi. 10, fig. 64). Specimens from Point Loma, near San Diego, 

 California, (in the author's collection) have, however, the elytral pro- 

 portions approximately as shown by Johnson (pi. 13, figs. 161, 162). 



The arrangement of the papillar lobes on the parapodia is more or 

 less constant in all inch'viduals. The notopodium has two or a few 

 larger, stouter lobes on the posterior side, near the point where the noto- 

 aciculum emerges. On its anterior side there is a series of 8 to 12 deli- 

 cate, filiform lobes, along the line where the dorsalmost notopodial setae 

 emerge. The neuropodial lobes are shorter than those of the notopodium, 

 and limited to the anterior side of the podia. The ventral cirrus has a 



