360 PROCEEDINGS OF THE ACADEMY OF [June^ 



each radiole, are aggregated. Several regenerating radicles bear no 

 eyes. The dorsal branchial wing is well developed and there is a slight 

 ventral inflection of the branchial base. The collar has well developed 

 dorsal lobes near the median line, separated by a pair of very deep wide 

 notches from the lateral lobes, which rise abruptly above the collar 

 setse. There is a little pigment on the dorsum of segments II to IV. 

 The tube is rather soft and flexible and covered with rather coarse sand 

 grains. 



Stations 4269, Afognak Bay, Afognak Island, Alaska, 14^19 

 fathoms, hard gray sand and rocks ; 4271, same region, 11^20 fathoms, 

 hard gray sand and rock. 

 Pseudopotamilla brevibranohiata Moore. 



PseudopotamiUa brevibranchiafa Moore, Proc. Acad. Nat. Sci. Pliila., 1905, 

 pp. 555-559, PI. XXXVII, figs. 1-7. 



Type and cotype taken at Station 4247, Kasaan Bay, Prince of Wales 

 Island, 95-114 fathoms, mixed mud, sand and broken shells. 

 Pseudopotamilla occelata Moore. 



Pseudopotamilla occelata Moore, Proc. Acad. Nat. Scj. Phila., 1905, 559-562, 

 Pi. XXXVII, fig. 8-14. 



This species occurs at the following stations : 4202, off Fort Rupert, 

 Vancouver Island, 25-36 fathoms, gray sand; 4261, Icy Strait, 10 

 fathoms, mud and rock; 4269 and 4270, 14-19 fathoms, hard sand and 

 rock. The largest specimens, among them the type, are yielded by the 

 last station listed. 

 Pseudopotamilla debilis Bush. 



Pseudopotamilla debilis Bush, Tubicolous Annelids of the Pacific Ocean, 

 Harriman Alaska Expedition Reports, 1905, p. 204. 



A single specimen lacking the posterior part represents this species. 

 There are 16 pairs of gills 14 mm. long. Eyes appear to be totally 

 wanting and the gills are marked by a pale brown zone near the base 

 and another al)out midway of their length. The collar is remarkable for 

 its prominent dorsal lobes. The tube is long, slender, flexible, and 

 sparsely covered with sand grains and an occasional small pebble. 



Station 4197, Gulf of Georgia, Halibut Bank, 31-90 fathoms, sticky 

 green mud and fine sand. 



Chone gracilis Moore. 



Chone gracilis Moore, Proc. Acad. Nat. Sci. Phila., 190G, pp. 257-259, PI. 

 XII, figs. 62-66. 



Known through the type, which comes from Station 4274, Alitak 

 Bay, Kadiak Island, 35-41 fathoms, green mud and fine sand; and a 

 smaller specimen taken at Station 4253, Stephens Passage, 131-188 

 fathoms, rocks and broken shells. 



