142 NATURAL HISTORY OF ARCTIC AMERICA. 



Spirorbis lucidus (Mont.) Morch. 



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

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

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



Spirorbis quadrangularis Stimpsou. 



Cumberland Gulf, lo*v -water. One specimen. 



GEPHYREA. 



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



Fhascolosoma margaritaceum KoREX and Daxielssex, Fauna Litt. Norveg. 

 iii, p. 135, 1)1. 15, figs. 43, 44, 1877. 



A large specimen, about C inches long, from the stomach of a Cottits, 

 in Cumberland Sound, September G, 1878 (lot 1C85), probably belongs to 

 this species. 



Total length 150""» ; diameter of body, 18'""' ; length of proboscis 

 from anal opening to end, 112™"'. Body large, round, abruptly rounded 

 posteriorlj-, with a slight mammilla at the tij) ; anteriorly it tapers gradu- 

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

 cud. The surface api^ears nearly smooth to the eye, except that there 

 arc 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 longitudiiKil wrinkles, 

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

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

 the longitudinal wrinkles become distinct grooves, converging to the tij), 

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

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

 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 

 beliind the anal oj)ening, 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 l)etween them. Segmental organs large, thick, 

 cylindrical, obtuse, dark biown. alxMit 2.">'""' long and o""" in diainctcr; 

 their oi)enings somewhat in advance of the origin of the dorsal retrac- 

 tors and lower do\m on the sides. Intestine very long, forming a dou])]e 

 coil of numerous turns, filling the posterior ]):irt of the body to the end. 

 Generative organ voluminous, surrounding ilic intestine. A slender 



