NO. 9 MARINE INVERTEBRATES, ALASKA — MacGINITIE II5 



Table 8. — The parasites of Point Barrow, Alaska, and their hosts — continued 

 host parasite 



Fish 

 Boreogadus saida, on gills Hemobaphes cyclopterina 



Decapods Leech 



SclerocrangoH boreas, on exoskeleton Crangonobdella murmanica 



ISOPOD 



Eualus gaimardi, on abdomen Phryxtis abdoniinalis 



DISCUSSION OF ANIMALS BY PHYLA ^ 



Phylum PROTOZOA 



Because of the time-consuming techniques involved, no attempt 

 was made to collect protozoans other than the Foraminifera. These 

 are extremely abundant at Point Barrow and are attached to practi- 

 tically everything — hydroids, bryozoans, stones, barnacles, shells, 

 worm tubes, chitons, and tunicates. The furrows in the shells of 

 Pecten islandicus are favorite nestling niches, and the tunic of tuni- 

 cates and the girdle of chitons {Symmetrogephyrus vestitiis) are 

 places of attachment sufficiently plastic to permit the Foraminifera 

 to form depressions to fit their tests. Other epizoic forms of Protozoa 

 were observed on such animals as crustaceans, mollusks, hydroids, 

 and bryozoans. 



Whenever possible, Foraminifera were picked from other animals 

 and preserved and labeled. Sediments washed from the collections 

 were also saved and labeled. All this material was turned over to 

 Dr. Alfred R. Loeblich, Jr., and from it he identified 66 species, in- 

 cluding 4 new genera and ii new species. In the summer of 1950, 

 when Dr. Loeblich spent a few weeks at Point Barrow, he accom- 

 panied the writer on dredging trips and during this time he added 9 

 more species, including 2 new ones, to the collection, making a total 

 of 75 species. The results of the study of these Foraminifera have 

 already been pubHshed (Loeblich and Tappan, 1953). 



Phylum PORIFERA 



Sponges often formed a conspicuous part of the fauna of the dredge 

 hauls. Except in the waters from Eluitkak Pass to Elson Lagoon 

 (depth 40 feet, bottom of stones, gravel, and mud), almost no sponges 



3 Detailed information concerning individual species could not be included in 

 this discussion. Any reader interested in more specific data on any animal or 

 group of animals should contact the writer. 



