CHAMBERIJX: PACIFIC COAST POLYCHAETA. 269 



crossed longitudinally by purplish lines, one being opposite the interval 

 between each two radioles. On the thorax a broad purplish brown longitudi- 

 nal band mesad of and more or less embracing the notopodia on each side, a 

 yellow median dorsal stripe between the two dark bands, the latter fading 

 out caudad. Ventral plates pale orange, the anterior thoracic ones darkened 

 at each lateral end, a dark band extending up each side of the first segment 

 and a dark line in front and one behind each of the anterior tori. Ventral 

 lobes of collar not extending much forward, broadly overlapping in the middle 

 line. The dorsolateral incision on each side deep and narrow; each dorsal 

 lobe extending forward beyond the lateral part, oblong, with ectoanterior 

 corner and anterior end convexly rounded, the anteromesal corner subrec- 

 tangular, the mesal edge a little concave, the ectal gently convex. Free dorsal 

 margins of branchial basal membrane not at all incised or lobed, well separated. 

 No eyes present. Radioles twenty-two on each side, in a simple series. All 

 thoracic plates and the first abdominal one entire, the other abdominal plates 

 longitudinally bisected. Thoracic uncini characterized by an unusually long 

 and erect neck, the lower protruding lobe small, the beak straight and widely 

 diverging. Inferior thoracic setae distally spatulate with a slender acute tip 

 usually curving more or less at an angle with the blade. 



Length, 35 mm.; greatest width, 3.5 mm. 

 Locality. — Panama. 

 Type.— M. C. Z. 72. 



The tube proper is tough and parclmient-hke with outer surface 

 densely coated with shell fragments and sand. 



Serpulidae. 



38. Serpula vermicularis Linne. 

 Syst. nat., ed. 12, 1767, 1, p. 1267. 



Serpula vasifera Haswell, Proc. Linn. soc. N. S. W., 1885, 9, p. 608, pi. 31, 



fig. 1, pi. 32, fig. 6-8. 

 Serpula columbiana Johnson, Proc. Boston soc. nat. hist., 1901, 29, p. 432, 



pi. 19, fig. 199-204. 

 Serpula narconensis Collin, Semon's forsch. Austr. Malayen archipel., 1902, 



p. 100. 

 Serpula granulosa Willej', Ceylon pearl 03'ster fisheries report. Suppl., 1905, 



p. 316, pi. 7, fig. 186, lS6a. 



Several specimens of this widespread form, of which the synonomy 

 pertaining to the Pacific region only is given, with their bright w^hite 

 tubes were taken by Mr. Agassiz at Mendocino, and in the Gulf of 

 Georgia, Wash. 



