330 PROCEEDINGS OF THE ACADEMY OF [June, 



The cephalic appendages may possess a filamentous distal part. An 

 incomplete example filled with eggs, and taken at Station 4215, has 

 the median tentacle twice as long as the lateral and is referred doubt- 

 fully to this species. 



Stations 4219, Admiralty Inlet, vicinity of Port Townsend, Wash- 

 ington, 16 fathoms, soft green mud, from starfish; 4222, same region, 

 39 fathoms, gray sand and broken shells, from holothurian (Siichopus 

 californica) ; 4223, Boca de Quadra, southeastern Alaska, 48-57 fathoms, 

 soft green mud, young; 4272, Afognak Bay, Afognak Island, 12-17 

 fathoms, sticky mud, one very beautiful specimen and one smaller and 

 colorless one, both from the ten-armed starfish (Solasler decemradiata). 



Halosydna lordi Baird. 



Halosydna lordi Baird, Journ. Linn. Soc. London, VIII, (1SG5), p. 190. 

 A single imperfect specimen without elytra represents this species. 

 In the same bottle is an arm of a starfish {Luidia columbice Gray) , upon 

 which it was presumably commensal. Nanaimo Bay, Vancouver 

 Island, B. C, 12 fathoms, on fish line. 



Halosydna insignis Bair.l. 



Halosydna insignis Baird, Journ. Linn. Soc. London, VIII, (1865), p. 188. 



Johnson in his paper on the Polychaeta of Puget Sound has already 

 noted the occurrence of this species as far north as Kadiak Island, 

 Johnson also describes in the Proc. Cal. Acad. Sci. for 1897 some most 

 interesting variations in relation to habitat. 



Of the several specimens in this collection scarcely two are alike in 

 color, and they also differ in the extent to which the back is covered by 

 the elytra, the tuberculation of the elytra and the shape of the end of 

 the dorsal cirri — whether abruptly terminating in a short filament or 

 not. None of the specimens is recorded as commensal. 



Union Bay, Vancouver Island, B. C. ; Port Townsend, Washington, 

 at Quarantine Dock; Stations 4209, Admiralty Inlet, Port Townsend, 

 Washington, 24-25 fathoms, rocks, coarse sand and shells; 4253, 

 Stephens Passage, Alaska, 131-188 fathoms, rocks and broken shells. 



Lepidonotus robustus Moore. 



Lepidonotus robustus Moore, Proc. Acad. Nat. Sci. Phila., 1905, pp. 544-546, 

 PI. XXXVI, figs. 32-35. 



The only known specimen of this noteworthy species was taken from 

 the shell of a hermit crab at Station 4291, Shelikof Strait, 48 to 65 

 fathoms, bottom of blue mud, sand and gravel. 



