SABELLIDES AND SERPULIDES 233 



CRUCIGERA ZYGOPHORA (Johnson). 



pi. xxix, fig. 5; pi. xxxi, fig. 2; pi. xxxui, fig. 3; pi. xxxix, 



figs. 8, 12, 13, 15, 17,20. 



Serpula zygophora JOHNSON, Proc. Boston Soc. Nat. Hist., vol. 29, p. 433, 

 pi. 19, figs. 205, 208, 1901. 



Type locality. Puget Sound. 



Color, salmon or yellow, with the branchiae irregularly banded with 

 deep crimson, the operculum variously mottled with the same color, 

 sometimes flecked on its outer surface with minute white specks. 



The branchial lobes are characteristic of the Serpulas, each with 

 about 30 branchiae, having long, slender, tapered rachises, with very 

 long (over 6 mm.) filamentose ends and moderately long delicate 

 pinnae. 



Thoracic membrane with a wide free margin extending forward as 

 an exceedingly deep collar, the ventral lobes of which often roll back- 

 ward, nearly or quite covering the thorax. 



Segments numerous, 115 or more; 6 on the thorax below the 

 collar ; those on the abdomen often marked only by the lines of uncini. 



Often two opercula ; the primary one bell-shaped, thick, shallow, 

 sometimes so thick as to become flat on top, with 28 to 30 radii form- 

 ing a bluntly scalloped margin ; at its base are 3 conspicuous unequal 

 processes, attached by a long peduncle to the base of one of the 

 branchial lobes at its outer dorsal end ; the secondary one, which is 

 more or less club-shaped, without basal processes is, when present, 

 attached by a shorter peduncle to the opposite lobe. 



Length 50 to 80 mm.; breadth about 3 mm.; branchiae about 15 

 mm. ; diameter of operculum 4 mm. 



One imperfect specimen is recorded by Johnson from Puget Sound, 

 1901 ; Sitka, June 15, common; Orca and Virgin Bay, Prince Wil- 

 liam Sound, June 25 and 27, very common. 



Tube thick, calcareous, attached to fragments of shells in variously 

 twisted masses, the free anterior end with a flaring margin. 



CRUCIGERA FORMOSA sp. nov. 



4 ; pi. xxxi, fig. i ; pi. xxxni, fig. 4 ; pi. xxxix, fig. 6, 7, 

 10, ii, 14. 



Type locality. Dutch Harbor, Unalaska Island. 



This species differs from the preceding in having shorter branchiae, 

 their rachises with short terminal filaments, sometimes wanting; yel- 

 lowish in preservative but a * brilliant red ' in life. 



pi. xxvni, figs. 3, 4 ; pi. xxxi 



