POLYCHAETE WORMS, PART 1 



189 



Postacicular setae long, smooth. Dorsal and ventral cirri small, 

 conical. Branchiae (fig. 47c) begin on setigers 10-14 (setiger 10, ac- 

 cording to Theel; setigers 12-14 on specimens examined), few in 

 number (?) (at least 8 pairs on specimens examined, none complete 

 posteriorly, may be lacking according to Friedrich, 1939). Branchiae 

 are cirriform and may be curled inward. 



Biology. — A primitive type nephtyid dredged on bottoms of sand, 

 muddy sand, mud, and globigerina ooze. 



Figure 47. — Nephtyidae, a, Nephlys longosetosa, parapodi\im from middle region, posterior 

 view, tips of notosetae not shown, h-c, Micronephthys minuta: b, parapodium from anterior 

 region; c, parapodium from middle region, d, Nephtys paradoxa, parapodium from 

 middle region, anterior view, e, Nephtys squaviosa, dorsal view two parapodia from 

 middle region. 



