96 THÉEL, NORTHEEN AND ARCTIC INVERTEBRATES. I. SIPUNCULIDS. 
singular phenomenon and, to my knowledge, only Phascolion manceps' of SELENKA 
and O. squamatum of KOREN and DANIELSSON appear to exhibit anything similar. 
Onchnesoma squamatum (KOREN and DANIELSSEN 1875 and 1877). 
Pl. XI. Figs. 153—156, Pl. XIII. Figs. 183—184, Pl. XV. Figs. 214—215. 
Phascolosoma olivaceum M. Sars 1868. (Without description; according to KOREN 
and DANIELSSEN). 
Phascolosoma squamatum KOREN and DANIELSSEN 1875 and 1877. NORMAN 
1894.” 
Phascolion squamatum SELENKA 1885. 
Habitat: 
West Coast of Norway: Lofoten, 300 fms (Mus. Chr.) — Trondhjem Fjord, 
Rödberg, 250—300 m., 17 sps dredged up by ÖSTERGREN and ÅRWIDSON 1898, (Mus. 
U. and Mus. L.) — Hardanger Fjord and Kors Fjord, sand and clay, 100—200 fms, 
several sps taken by KOREN and DANIELSSEN (Mus. B.-.). 
Distribution in General: 
West off Norway: 61” 30 n.—3” 36' e., clay, 377 m. (Kor. & DAN.), several 
sps. — 66” 49 n.—12” 8 e., soft clay with sand, 260 m. (Kor. & DAN.), I sp. — 
67” 52 n.—13” 57 e., clay, 247 m. (Kor. & DAN.), 1 sp. — Trondhjem Fjord, Har- 
danger and: Kors Fjords (NORMAN)”. North Atlantic Ocean: 48” 26' n.—9” 44' w., 
358 fms (SELENKA) — 59? 34 n.—7” 18 w., 542 fms (SELENKA) — 48” 50" n. — 
11” 9 w., 725 fms (SELENKA) — 59” 40' n.—7” 21' w., 516 fms (SELENKA). The spe- 
cies must have a wide distribution in the North Atlantic Ocean, but it does not seem 
to descend to any very considerable dephts. 
I do not agree with SELENKA (1885) when he says: "This species occupies a 
position only just within the genus Phascolion, being indeed a sort of connecting 
link with the genus Phascolosoma. It may be ranked as a species of Phascolion 
on account of (1) the disappearance of one of the two segmental organs and the 
fixing of the remaining one by means of a mesentery, (2) the coalescence of the re- 
tractors of the proboscis and of the shifting of their insertion to the hind end of 
the body, (3) the smaller size of the tentacles, (4) the large size of the eggs, (5) the 
development of the ordinary dermal papille into attaching papille, (6) the partial un- 
winding of the intestinal spiral into loose coils. On the other hand, since the in- 
testinal spiral may still have as many as twelve double coils, the species may be 
claimed, as KOREN and DANIELSSEN have done, for the genus Phascolosoma. On 
1 With reason it may be questioned whether this species really belongs to the genus Phascolion, 
? Ann, Magaz. Nat, Hist, XIII. Ser, 6. London 1894. 
