POLYCHETA FROM NORTH AMERICA. 803 



Specific characteristics : — 



1. Collar setse finely striated blades with basal fin. 



2. Opercidum with large bi-ood-ponch. 



3. Convex calcareous cap with long cylindrical projection 



(figs. 14, 15, pi. xliii., Bush (3) 1905). 



Victor-ia ; two specimens only obtained. 



Tubes measure 2 and 3 mm. across respectively ; each has a 

 very conspicuous median ridge and two lateral ones, the outer 

 one being at the top of the perpendicular outer wall. The stria- 

 tions on the blades of the collar setas could hardly be distinguished 

 at all. Some setae in the third fascicle were serrated, bladed 

 sickles. The collar and thoracic membrane were well developed 

 on the right side, and there was a long asetigerous region 

 following the thorax. There were 12 abdominal segments with 

 geniculate setse. 



Most of the specimens described in this paper were obtained 

 during a stay at the Marine Biological Station, Departure Bay, 

 Vancouver Island, in the summer of 1911. Mr. F. A. Potts 

 kindly collected those from Puget Sound and some others : I 

 should like to take this opportunity of thanking him, also the 

 Rev. G. W. Taylor, F.R.S.C., Curator of the Marine Laboratory, 

 Departure Bay, for his kindness and help with regard to dredging 

 arrangements, and Dr. Marett Tims for his advice and assistance 

 throughout. 



References. 



1. Benedict, J. E. — Description of ten species and one new 



genus of Annelids from the dredgings of the U.S. Fish 

 Commission Steamer ' Albatross.' Proc. U.S. Nat. Museum, 

 ix. p. 547, pis. xx-xxv. Washington, 1886. 



2. Bush, K. J. — On Spirorhis from Japan (see under Moore 



3. Bush, K. J. — Sabellidae and Serpulidpe. Harriman Alaska 



Expedition, vol. xii. 1905. 



4. Bush, K. J. — Description of new Serpulids from Bermuda, 



with notes on known forms from adjacent regions. Proc, 

 Acad. Nat. Sci. Philadelphia, vol. Ixii. 1910. 



5. Caullery, M., et Mesnil, F. — Etudes sur la morphologie 



comparee et la phylogenie des especes chez les Spirorhis. 

 Bull. Sci. France et Belgique, xxx. pp. 185-233. Paris, 

 1897. 



6. Daudin, F. M. — Recueil de memoires et de notes sur les 



especes inedites ou pen connues de Mollusques, Yers et 

 Zoophytes, Paris, 1800, p. 38. jSToviveau genre de Ver a 

 tube calcaire, voisin des Serpules et des Dentales. Bull, 

 Sci. Soc. Philom., Paris, ii. p. 145, 1800. 



7. Fabricius, O. — Fauna Groenlandica. Copenhagen and 



Leipzig, 1780, 



