POLYCHAETE WORMS, PART 1 



199 



to blackish. Preaciciilar setae short, dark brown, barred; postacicular 

 setae relatively short, deep yellow, minutely serrated. Tips of acicula 

 may be covered with chitinous plates. Ventral cirri short, flattened, 

 triangular to conical. Branchiae begin on setigers 6-8, small anteri- 

 orly, becoming larger, then in the posterior half becoming smaller 

 where they may be equal in size to the dorsal cirri, absent from 

 the last 12 or so segments; where best developed, they are large, 

 recurved, sickle-shaped. Dorsal cirri small anteriorly, becoming 

 large, flattened, triangular, then smaller, digitiform in the posterior 

 region. 



Proboscis (fig. 496) with 10 pairs bifid terminal papillae and 20-22 

 longitudinal rows of subterminal papillae, 1-6 per row. Papillae very 

 small. Large middorsal and smaller midventral papilla present. 



Figure 50. — Nephtyidae, a-b, Nephtys bucera: a, ventral view anterior end; b, branchia and 

 branchial or dorsal cirrus from middle parapodium. c~f, Nephtys picta: c, ventral view 

 anterior end; d, branchia and branchial or dorsal cirrus from middle parapodium; e, spinous 

 postacicular notoseta from middle parapodium;/, part of same, enlarged. 



