30 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7 



Halosydna vittata Baird, 1865, p. 188. 



Acholoe vittata Marenzeller, 1902, pp. 576-577, pi. 3, fig. 13. 



Arctonoe Ha Chamberlin, 1920, pp. 6B-7B, pi. 1, figs. 1-4, pi. 2, 



figs. 1-3. 

 Halosydnoides vittata Seidler, 1924, pp. 134-135 ; Monro, 1928c, p. 312. 

 Halosydna succiniseta Hamilton, 1915, pp. 234-235, figs. 1-4. 



Collection. — 20-33, at night, with electric light. 2 specimens. 



Pale or white; length to 25 mm, number of setigerous segments to 

 56. The prostomium is broader than long and has clavate appendages 

 (pi. 3, fig. 33). Elytra present on some segments throughout length; 

 they are smooth, pale, the edges entire or the outer edge slightly frilled. 

 The first parapodium (segment 2) has bifid notopodial (pi. 3, fig. 36) 

 and neuropodial setae (pi. 3, figs. 35, 37). The neuropodial setae in 

 more posterior segments are stout, few, to 5 or 6 in a fascicle, with 

 obscure rows of pectinae at the widest region (pi. 3, fig. 34). 



No fine swimming setae or other specialized natatory organs could 

 be detected that might explain the presence of these two individuals in 

 the surface tow at night. Also, they are not sexually mature. The length 

 of the specimens (25 mm) indicates that they were well past the pelagic 

 larval stage, known to exist in some polynoids. 



This is the first record of this species south of southern California. 



Distribution. — Japan ; Alaska ; western North America to San 

 Diego; Ecuador. Intertidal to 12 fms. Often found associated with 

 Fissurella or other gastropods. 



Genus EULAGISGA Mcintosh 



Body short, depressed ; lateral antennae inserted subterminally, the 

 median antenna dorsal to the paired ones. Elytra 15 pairs, inserted as 

 in Har?nothoe Kinberg. Notopodial and neuropodial lobes developed, 

 attenuated distally to a slender tip. Notopodial setae numerous, some as 

 stout as, or stouter than, the neuropodial setae; distally entire, and with 

 transverse rows of pectinae more or less obscured. Neuropodial setae 

 numerous, their tips entire or with a minute subterminal tooth (pi. 3, 

 fig. 38), with transverse rows of pectinae more obvious than in the 

 notopodial setae. 



