344 PEOCEEDINGS OF THE ACADEMY OF [June, 



and 1 heteronereis (male) from shell of hermit crab; 4220, same region 

 16-31 fathoms, green mud, sand and broken shells. 



Nereis (Alitta) vexillosa Grube. 



Nereis vexillosa Grube in Middendorff, Reise in Siberiens, etc., II, 18-51, p. 4. 

 Nereis vexillosa, Johnson, Proc. Bos. Soc. Nat. Hist., XXIX, p. 399. 



On the Pacific this species represents the Nereis limbata, so abundant 

 along much of the Atlantic coast of North America. It, however, 

 reaches a larger size. As but little shore collecting was done it is not 

 represented in the collection from many points. 



Taylor Bay, Gabriola Island, Gulf of Georgia; Quarantine Rock, 

 Port Townsend, and the beach near Shakan, Sumner Strait, south- 

 eastern Alaska; collection Acad. Nat. Sci. Phila., Admiralty Inlet, 

 Puget Sound, Washington, by George Dawson. 



Nereis (Alitta) virens Sars. 



Nereis virens, Johnson, Proc. Bos. Soc. Nat. Hist., XXIX, p. 398. 



I have not given very close attention to the specific likeness or dis- 

 tinction of the Atlantic N. virens and the Pacific A", hrandti, but so far 

 as comparisons have been made they appear to confirm Johnson's view 

 that the two are identical. Being chiefly a shore lover like the last it is 

 not well represented in this collection. 



Taylor Bay, Gabriola Island, B. C., 11 specimens varying from 9 to 

 18 inches long. Many are in regeneration posteriorly and the number 

 of segments appear to exceed the average attained by Atlantic speci- 

 mens. Union Baj'', Alaska, a splended example unfortunately incom- 

 plete, but which in life must have exceeded 2 feet in length. The ten- 

 tacular cirri are very short and thick. Also one in the Academy of 

 Natural Sciences, collected by George Dawson at Admiralty Inlet, 

 Washington. 



Platynereis agassizi (Ehlers). 



Nereis agassizi Ehlers, Die Borstenwurmer, 1868, p. 542. 



It seems probable that the Japanese specimens referred to N 

 dumerilii by Marenzeller belong to this closely related but perfectly 

 distinct species. A small heferonereid resembling that of the Atlantic 

 P. megalo-ps was taken at Quarantine Rock, near Port Townsend, on 

 June 27. 



Kilisut Harbor and Quarantine Rock, near Port Townsend, Wash- 

 ington. Stations 4219. Admiralty Inlet, near Port Townsend, Wash- 

 ington, 16-26 fathoms, green mud, sand and broken shells; 4223, Boca 

 de Quadra, southeastern Alaska, 48-57 fathoms, soft green mud. 



