NO. 9 



MARINE INVERTEBRATES, ALASKA — MacGINITIE 



97 



9- 9-49 



9-12-49 



Morning: Surf very light; small waves coming in irregularly. A 

 gentle east wind. Themisto libellula much more abundant than on 

 9-6-49, forming a streak about a foot in width along the beach. 

 Pycnogonids and the amphipod Melita jormosa were common. 



Above the high water mark there were three rows of Themisto 

 libellula extending along the beach, the first about 4 feet above the 

 water line, the second about 6 feet, and the third about 15 feet. The 

 amphipods were abundant in the first two rows, but the highest row 

 was so thick with amphipods that they could be scooped up in great 

 masses with the hands. All the depressions in the gravel were filled 

 with the animals. At random spots in the top row a segment 10 cm. 

 long was marked off and the amphipods contained therein were 

 counted. 



In and around the masses of phronimids along approximately three- 

 fourths of a mile of beach, the following animals were found : 



Lafoeina maxima 



Sand anemone 



Cerianthus sp. 



Sea anemone 



Echiunus echiurus alaskanus 



Arenicola glacialis 



Harmothoe imbricata 



Phyllodoce groenlandica 



Melita formosa 



Gammar acanthus loricatus 



Dulichia spinosissima 



D. arctica 



Caprellids 



Idotaega entomon 



I. sabini 



Sclerocrangon boreas 



Pagurus trigonocheirus 



Pycnogonids 



Tectibranch 



Dendronotus frondosus 



Buccinum sp. 



Boreotrophon pacificus ? 



Common 



2 fragments 



I 



3 



3 



Few 



3 



3 



Common 



1 male, i female 

 I 



I 



2 species 

 Several 

 Several 



I ovigerous female 



Few 



14 (3 species) 



Several 

 9 shells 



