NO. 9 MARINE INVERTEBRATES, ALASKA — MacGINITIE 6i 



surface dwellers and those living on the shoreward border. The fol- 

 lowing is a list of the animals of this region in the order of their 

 relative abundance : 



Echiurus echiurus alaskamis (echiuroid worm) 

 Arcnicola glacialis (polychaete — lugworm) 

 Myriotrochus rinki (sea cucumber) 

 Antinoe sarsi (polychaete) 

 Melaenis loveni (polychaete) 

 Harmothoe imbricata (polychaete) 

 Hamingia arctica (echiuroid worm) 

 Halicryptus spinulosus (priapulid worm) 

 Burrowing anemones (2 species) 

 Burrowing tunicates (2 species) 

 Mya truncata, small (clam) 

 M. japonica, small (clam) 



Living within the mud in the mud zone farther out, the following 

 were found : 



Cerianthiis sp. (burrowing anemone) 



Macoma calcarea (clam) 



Astarte montagiii (clam) 



Myriotrochus rinki (burrowing sea cucumber) 



Nucula tenuis (clam) 



Musculus discors var. laevigatus (clam) 



M. corrugatus (clam) 



Nuctdana sp. (clam) 



Macoma oneilli (clam) 



On the surface in the mud zone the following were common: 



Foraminifers 



Dulichia porrecta (amphipod) 

 Pagurus splendescens (hermit crab) 

 P. trigonocheirus (hermit crab) 

 Hyas coarctatiis alutaceus (crab) 

 Serripes groenlandicus (clam) 

 Liocyma Huctuosa (clam) 



Not strictly confined to the bottom was the ubiquitous amphipod 

 Aphenisa glacialis, which might be found on the undersides of ice 

 cakes, among the gravel, or on the bottom. 



The rubble zone varied greatly in different areas, depending on the 

 size of the rubble and the amount of shell, gravel, and mud. In gen- 

 eral, the farther from shore the more often patches of mud were en- 

 countered, perhaps because of the weaker currents in this area, at 

 least along the bottom. Fauna was most abundant in those regions 

 containing large boulders — a conservative estimate, based on the num- 

 ber of animals collected, would indicate about 1,154 tons per acre. 



