134 Pub. Puget Sound Biol. Sta. Vol. 2, No. 42 



on reefs at low tide and on piles under wharves. This is commonly called 

 the sea lemon. The egg masses are common during the early part of the 

 summer session, June 24 to July 16. The eggs are laid in a yellow rib- 

 bon 16-22 mm. wide, attached at one edge and wound in a spiral which is 

 closer on the attached than on the free edge. This animal may be brought 

 into the laboratory, where it will continue to lay eggs. 



Melibe lenina Gould. Occasional. A large nudibranch found on the 

 eelgrass on the channel side of Brown Island. The egg masses are similar 

 in form to those of other doridae, except that they are creamy-white in 

 color. It is found early in season rather than latet. 



Annelida 



Nereis virens Sars. Occasional thruout June to August. While the 

 adult specimens are abundant on the beaches near the Station, but com- 

 paratively few animals are taken that yield ripe eggs and sperms. 



Nereis agassizi Ehlers. A single specimen Avas picked up near 

 Brown Island on Aug. 4, 1917; and shed its eggs in the laboratory during 

 the night. It is possible these may be obtained earlier. Occasionally they 

 have been seen in the act of swarming, but no definite period can be set. 

 The larvae are taken in considerable number in the tow early in the season. 



Serpula columbiana Johnson. Abundant. The worm may be most 

 easily collected at Turn Rock or Minnesota Reef, where its tubes will be 

 found attached to the numerous smaller rocks, which may be brought into 

 the laboratory with the worm uninjured. They yield quantities of eggs. 

 The extrusion of the polar bodies is very conspicuous and development 

 progresses rapidly. 



Amphitrite robusta Johnson. Abundant forms living in sand-tubes 

 under rocks at low tide. They yield eggs and partially motile sperms to- 

 ward the end of the season, and are then probably approaching their season. 



Amphitrite spiralis Johnson. Abundant forms living in sand tubes 

 under rocks at low tide. The season for egg-laying is probably during 

 August, since partially ripe eggs and sperms can be obtained during the 

 last days of July and early in August. 



Polynoe squamata A. & M. Edwards. Common forms. They were 

 approaching their season on Aug. 4, in 1917, and somewhat earlier, July 

 6, in 1918, judging from well developed eggs and motile sperms found in 

 several individuals. 



Arenicola claparedei Levinsen. Abundant in sand at False Bay. Re- 

 cently laid egg masses were numerous by July 7, 1918. 



Glycera, Clymenella and Arenicola appeared to be spent when ex- 

 amined during the season of 1917; but Arenicola was in the midst of egg- 

 laying on July 7, 1918. 



