362 PROCEEDINGS OF THE ACADEMY OF [June, 



much coiled and coherent in chimps. One isolated tube is much coiled 

 at the attached base, with an erect free end. 



Stations 4209, Admiralty Inlet, vicinity of Port Townsend, Wash- 

 ington, 24-25 fathoms, rocks, coarse sand and shells; 4261, Dundas 

 Bay, Icy Strait, Alaska, 8^10 fathoms, green mud and rocks; 4263, 

 same region, 6^9 fathoms, coarse sand and rocks; 4271, Afognak Bay, 

 Afognak Island, 11^^- to 20 fathoms, hard gray sand and rock; 4283, 

 Chignik Bay, 30-41 fathoms, black sand and brown sponge. Empty 

 tubes, apparently of this species, were found at Stations 4202, 4204 and 

 4289. 

 Hyalopomatopsis occidentalis Bush. 



Hyalopomatopsis occidentalis Bush, Tubicolous Annelids of the Tribes 

 Sabellides and Serpuhdes f rom the Pacific Ocean, Harriman Alaska Expedi- 

 tion Reports, 1905, p. 229. 



One was found attached to a tube of Serpula columhiana from Sta- 

 tion 4205, and another to a tube of Crucigera formosa from Station 

 4283. 

 Spirorbis quadrangularis Stimpson. 



Spirorbis quadrangularis Stimpson, Bush, Tubicolous Annelids of the Tribes 

 Sabellides and Serpulides from the Pacific Ocean, Harriman Alaska 

 Expedition Reports, 1905, p. 241. 



Found on tubes of Crucigera formosa at Stations 4271 and 4289. 



Spirorbis spirillum Linn. 



Spirorbis spirillum Linn., Bush, id., p. 243. 

 Numerous specimens attached to a piece of giant kelp from Station 

 4262, Dundas Bay, Icy Strait, 9 fathoms, coarse sand and rocks; also 

 a number in the collection of the Academy of Natural Sciences of 

 Philadelphia (No. 1090), collected by Mr. E. A. Mcllhenny at Point 

 Barrow, Alaska. 

 Spirorbis tridentata Levinsen. 



Spirorbis granulata var. tridentata Levinsen, Viden. Medd. Naturh. J'oren., 

 Kopenhaven, 1882, p. 350; not S. tridentata Bush. 



The tubes of this very characteristic species agree so closely with 

 Levinsen's figure that I refer them thereto, in preference to giving a new 

 name founded upon the peculiarities of the worm, though it may be 

 that the animal which occupies the tubes figured by Levinsen will prove 

 to be quite different. 



The figures of the tubes given by Levinsen would serve equally well 

 for these. They are close, sinistral, discoid coils without any true 

 central opening, the first coils being in contact in the center. As the 

 tubes grow older the outer turns tend to overlap and pile upon the 

 inner, leaving a deep central depression bounded by nearly vertical 



