ISOPODS OF NORTfl AMERICA. 



501 



'borgil; Casco Bay, Maine, on P. borealis; West Greenland; North 

 Greenland; Baffin Land; East Greenland. 



Pacific coast localities: Admiralty Inlet, Puget Sound, Washington, 

 on Spirontocaris grwnlandica; off North Head, Akutan Island, Alaska, 

 on S. arcuata; Straits of Fuca, between Washington and Vancouver 

 Island, on S. townxendi; Admiralty Inlet, Puget Sound, Washington, 

 on 8. tridens; Washington Sound, Straits of Fuca, Washington, on S. 



FIG. 550. PHRYXUS ABDOMINALIS (AFTER SAKS), a, LEG OP MALE, b, SPECIMEN OF SPIRONTOCARIS 



LILLJEBORGII INFESTED WITH PARASITE. C, MALE (DORSAL VIEW), d, DORSAL VIEW OF FEMALE, e, 

 FIRST LEG OF FEMALE. /, HEAD OF MALE (VENTRAL VIEW), g, FOURTH LEG OF FEMALE, h, VEN- 

 TRAL VIEW OF FEMALE, i, LAST SEGMENT OF ABDOMEN OF FEMALE, j, RIGHT PART OF BODY OP 



FEMALE, k, SAME (VENTRAL SIDE), I, MAXILLIPEDS. m, FIFTH TO SEVENTH RUDIMENTARY LEGS. 



tridens; off Queen Charlotte Sound, British Columbia, on S. macroph- 

 tkalma; off Yahwhit Head, Washington, on S. mawophtfialma; Iliu- 

 liuk Harbor, Unalaska, on S. suckleyi; Arctic Ocean on S. gaimurdii 

 $efcArt(Bell); Plover Bay, East Siberia, on S. polarix (Sabine); Alaska 

 on S. polar is (Sabine); off Cape Strogonoff, Alaska, on S. fabricii 



