POLYCHAETE WORMS, PART 1 



47 



Figure 10. — Sigalionidae, a-d, Sthenelais boa: a, dorsal view anterior end; b, prostomium; 

 f, parapodium; d, neuroseta (compound falclger, with bifid lip), e, Leanira tetragona, 

 neuroseta (compound splnigcr). /-g, Pholoe minuta: /, dorsal view anterior end, elytra 

 removed; g, elytron. 



angled. Neurosetae stouter, compound, with terminal blade short, 

 hooked, entire. Color: without color or greenish gray, variegated 

 brownish and black. 



Biology.- — ^In contrast to the other representatives of the family, 

 it is not a burrowing form but is found under rocks, in crevices, among 

 oysters, mussels, in holdfasts of algae (as Laminaria), in encrusting 

 algae, etc. Dredged on various types of bottoms as stones, mud, 

 and various combinations of mud, sand, gravel, stones, rocks, with 

 shells, bryozoans, hydroids, mussels, worm tubes. According to 

 Thorson (1946, p. 49), the species may reproduce all the year round 

 and have a nonpelagic development. 



