142 NATURAL HISTOEY OF ARCTIC AMERICA. 



Spirorbis lucidus (Mont.) Morch. 



Very common in Cumberland Gulf, on ascidians, algse, polyzoa, etc., 

 low- water to 9 fathoms 5 Penny Harbor, October 4; Annanactook Har- 

 bor, May 20, 1878; head of the Gulf, May 28, 1878. 



Spirorbis quadrangularis Stimpson. 



Cumberland Gulf, lo^ -water. One specimen. 



GEPHYREA. 



Fhascolosoma margaritaceum (Sars) Kor. & Dan. (?). 



Phascolosoma margaritaceum KOREN and DANIELSSEN, Fauna Litt. Norveg. 

 iii, p. 135, pi. 15, figs. 43, 44, 1877. 



A large specimen, about 6 inches long, from the stomach of a Cottus, 

 in Cumberland Sound, September 6, 1878 (lot 1685), probably belongs to 

 this species. 



Total length 150 mm j diameter of body, 18 mm ; length of proboscis 

 from anal opening to end, 112 mm . Body large, round, abruptly rounded 

 posteriorly, with a slight mammilla at the tip 5 anteriorly it tapers gradu- 

 ally into the proboscis, which is long and becomes slender toward the 

 end. The surface appears nearly smooth to the eye, except that there 

 are more or less irregular transverse wrinkles and slightly raised folds. 

 Under a lens it is seen to be everywhere finely transversely wrinkled 

 and striated, and in many parts reticulated with longitudinal wrinkles, 

 while small, depressed, sucker-like organs are scattered over the surface 

 of the body and base of the proboscis ; at the posterior end of the body 

 the longitudinal wrinkles become distinct grooves, converging to the tip, 

 with rows of suckers between them, and the circular wrinkles, crossing 

 the interspaces, are conspicuous. The proboscis is destitute of papillae 

 and hooks, and is smoother than the body, with faint indications of 

 transverse lighter and darker bands of color. Tentacles numerous, 

 slender. Internally the two dorsal retractors arise only a short distance 

 behind the anal opening, their bases being wide apart toward the sides. 

 The ventral retractors, arising near the middle of the body, are large 

 and stout, with their thick bases close together, barely leaving space for 

 the nervous cord to pass between them. Segmental organs large, thick, 

 cylindrical, obtuse, dark brown, about 25 mm long and 3 mm in diameter ; 

 their openings somewhat in advance of the origin of the dorsal retrac- 

 tors and lower down on the sides. Intestine very long, forming a double 

 coil of numerous turns, filling the posterior part of the body to the end. 

 Generative organ voluminous, surrounding the intestine. A slender 



