4d Canadian Arctic Expedition, 1913-18 



boscis, the latter more rugose toward tentacles. Tentacles in several rows. 

 Openings of segmental organs distinct. Body wall thin, in part translucent, 

 the inner surface with pearly lustre, muscle layer uniform, with no trace of 

 division into strands. Four retractor muscles present, of which the dorsals 

 are very much more slender posteriorly than the ventrals: ventrals taking their 

 origin about midway between anus and caudal tip of body and the dorsals 

 about five-twelfths the distance from anus to level of origin of ventrals. Seg- 

 mental organs elongate, free, opening near level of anus. Coils of intestine 

 numerous, wholly free excepting anteriorly. Total length of type, inclusive 

 of extended proboscis, 116 mm.: of body proper from anus to caudal tip 70 mm.; 

 distance from anus to tentacles, 46 mm. Greatest width 17 min; width at 

 level of anus, 7-3 mm. Length of caudal appendage, 7 mm.; width at base, 

 near 3-6 mm. 



Locality. — Hudson bay : Fort Churchill, October, 1910. James M. 

 Macoun. One specimen. 



Phascolosoma eremita (Sars) 



1851. Sipunculus eremita Sars, Nyt. Mag. for Naturvidensk., p. 197. 

 1865. Sipunculus {Phascolosomum) borealis Qtjatrefages, Hist. nat. 



Anneles, 2, p. 620. 

 1867. Phascolosoma boreale Kefebstein, Nach. d. k. Ges. d. Wiss. 



Gottingen, No. 7, p. 206. 

 1877. Phascolosoma eremita Koren and Danielssen, Fauna litt. Nor- 

 vegiae, 3d Heft., p. 134 pi. 15 f. 45. 



A form widespread in northern regions, having been recorded at various 

 stations from Greenland eastward to the Kara sea, the range extending 

 southward along the European coast to the North sea and along the North 

 American coast to Massachussetts or in deeper water even farther south (40° 

 N. lat.) A specimen was collected by the biological launch Prince at Station 

 4, in Passamaquoddy bay, N.B., October 8, 1917, at a depth of 25 to 30 meters. 



Phascolion strombi (Montagu). 



1804- Sipunculus strombus G. Montagu, Trans. Linn. Soc. London, 7. 



p. 74. 

 1828. Siphunculus dentalii Gray, Spicilegia zoologica, p. 8: 

 1841. Sipunculus bernhardus Forbes, Hist. British Starfishes, p. 251. 

 184S. Sipunculus capitatus H. Rathke, Nova Scotia Acad. Leop. Car. 



29, p. 143, pi. 6, fl. 20-23. 

 1844- Sipunculus (Phascolosoma) concharum Oersted, De regionibus 



marinis, p. 80; also Kroyer's Naturh. Tidskr., 1844, p. 419. 

 1865. Sipunculus {Cryptosomum) caementarium Qtjatrefages, Hist. nat. 



des Anneles, 2, p. 628. 

 1867. Phascolosoma hamulatum Packard, Mem. Bost. Soc. Nat. Hist. 



2, p. 290. 

 1873. Phascolosoma tubicola Verrill, Amer. Journ. Sci. and Arts, ser. 3, 5, 



p. 99. 

 1875. Phascolion spitzbergense Theel, Bihang till k. Svenska Vet. Akad. 



Handl., 3, p. 16, pi. 1, ff. 2, 3. 



A species widespread and abundant in the north Atlantic and Arctic regions. 

 In the collection submitted for study is a number of specimens of this form 

 collected by the biological launch Prince in Passamaquoddy bay, N.B. They 

 were taken on a muddy bottom at a depth of twenty-five to thirty meters 

 on October 8, 1917, and were found inhabiting shells of Apporrhais occi- 



