1908.] NATURAL SCIENCES OF PHILADELPHIA. 361 



SERPULID^ 

 Apomatus geniculata Moore. 



Protula geniculata Moore, Proc. Acad. Nat. Sci. Phila., 1904, pp. 16S, 169, Pis. 

 XI, figs. 17, 1S;XII, fig. 38. 



A small complete specimen bears 18 pairs of gills, the left dorsal- 

 most one of which is enlarged and flattened and 

 siip])orts only two or three barbs. In the bottle, 

 which contains no other specimens, is a detached 

 operculum which exactly fits the modified radiole 

 and without doubt belongs to this annelid, placing 

 it therefore in the genus Apomat us. The opercu- 

 lum has the form shown in the figure, being 

 broadly obovate or egg-shaped and quite smooth, 

 soft and membranous. In all other respects the 

 specimen agrees with the type. Some fragments 

 of tubes indicate that two are sometimes coherent Apomatus geniculata— 

 side by side. The operculum and 



station 4197, Halibut Bank, Gulf of Georgia, outline, x about'' 25. 

 31-90 fathoms, soft green mud and fine sand. 



Serpula columbiana Johnson. 



Serpula columhiana Johnson, Proc. Bos. Soc. Nat. Hist., XXIX, pp. 432, 433. 



Johnson describes the operculum as having about 100 ribs and 

 marginal denticulations. In these specimens the number is always 

 much greater and varies from 140 to 160. Miss Bush also has noted a 

 larger number on her specimens. The functional operculum is devel- 

 oped sometimes on the right, sometimes on the left side. The accessory 

 operculum is simply clavate. Varying with the size of the specimen 

 the branchiae number from 36 to 55 pairs. The seta? of the collar have 

 from 2 to 4 large, blunt teeth at the base of the long, slender, curved 

 tip, and the- uncini are usually 5- or 6-toothed. Tubes forming a 

 large mass coherent side by side are much thinner and more fragile than 

 tubes found singly. 



Port Townsend, on the dock at the .Quarantine Station, also Station 

 4205, Admiralty Inlet, vicinity of Port Townsend, Washington, 15-26 

 fathoms, rock and shells. 

 Crucigera formosa Bush. 



Crucigera formosa Bush, Tubicolous AnneUds of the Pacific Ocean, Harri- 

 man Alaska Expedition Reports, 1905, pp. 233, 234. 



This species seems very doubtfully distinct from C. zygophom (John- 

 son). The operculum is usually 26- or 27-rayed, but one specimen has 

 29 and another 32 rays. The tubes are thick and solid and generally 



