346 PROCEEDINGS OF THE ACADEMY OF [June, 



tuft of the usual expanded pectinate setse. All three kinds continue 

 to the last setigerous segment. 



A large number of tubes differ from the one described by Johnson. 

 They are 5 to 6 inches long and about 4 mm. in diameter, composed of a 

 tough, membranous, mucoid lining covered with a thick coating of 

 silt, often arranged in two distinct layers of quite different composition. 



Stations 4192, Gulf of Georgia, off Nanaimo, Vancouver Island, B. C., 

 89-97 fathoms, green mud and fine sand; 4193, Halibut Bank, Gulf of 

 Georgia, 18-23 fathoms, green mud and fine sand; 4194, same region, 

 111-170 fathoms, soft green mud, a great many tubes; 4197, same 

 region, 31-90 fathoms, sticky green mud and fine sand; 4198, same 

 region, 157-230 fathoms, soft green mud; 4223, Boca de Quadra, 

 southeastern Alaska, 48-57 fathoms, soft green mud; 4244, Kasaan 

 Bay, Prince of Wales Island, 50-54 fathoms, green mud; 42 6, same 

 region, 101-123 fathoms, gray-green nuid, coarse sand and shells. 



Nothria geophiliformis Moore. 



Nothria geophiUjormis Moore, Proc. Acad. Nat. Sci. Phila., 1903, pp. 445- 

 448. 



A single example from Station 4244, Kasaan Bay, Prince of Wales 

 Island, 50-54 fathoms, green mud. 



LUMBRINERID^. 



Lumbrineris heteropoda Marenzeller. 



Lunibriconereis heteropoda Marenzeller, Denks. Kaiserl. Akad. Wissensch. 

 Wien, 1879, Abth. 2, pp. 138, 139. 



A species of Lumbrineris widely and generally distributed over the 

 field covered by these explorations is assigned with much hesitation as 

 above. The variability of the jaws and the form of the prostomium 

 in species of this genus, taken with the fact that the exact region from 

 which the parapodia described or figured for many species have been 

 selected is often not indicated, renders identification of representatives 

 of this genus very difficult. The smaller examples resemble L. hetero- 

 poda in every respect, but the larger ones have the prostomium shorter 

 and more broadly rounded; the jaws vary in respect to the form and 

 number of teeth on the individual plates and probably in a greater 

 divergence of the lobes of the posterior parapodia. The j^resence of a 

 tuft of very long slender winged seta? in the lower part of the supra- 

 acicular tuft of the middle parapodia of some specimens is also a note- 

 worthy character which may indicate specific separation from L. 

 heteropoda. One fine example from Station 4251 is 380 mm. long, 7 

 mm. wide, and has 355 segments. It is filled with nearly mature eggs. 



