ISOPODS OF NORTH AMERICA. 



547 



and Pribilof Islands, Alaska, on Nectocrangon lar; Arctic Ocean, on 

 Nectocrangon lar; Popoff Straits, on Nectocrangon crasm; between 

 Bird and Nagai, Islands, on JVectocrangon alascensis. 



List of Crangonidse on which Argeia pugettemix is found parasitic: 



Nectocrangon ovifer Rathbun. 

 Nectocrangon lar (Owen). 

 Nectocrangon alascensis Kingsley. 

 Nectocrangon crassa Rathbun. 

 Nectocrangon dentata Rathbun. 

 Orago nigromaculata (Lockington). 

 Orago franciscorum angustimana (Rath- 

 bun). 



Crago dalli (Rathbun). 

 Orago communis ( Rathbun ) . 

 Crago propinqua (Stimpson). 

 Orago nigricauda (Stimpson). 

 Orago alascensis (Lockington). 

 Orago alascensis elongata (Rathbun). 

 Crago alba (Holmes). 

 Crago munita (Dana). 



Immature forms. A female (probably in the first post-larval stage) 

 has the thoracic processes well developed, sometimes only on one side. 



FIG. 590. ARGEIA PUGETTENSIS. SIXTH LEG OF SPECIMENS FOUND ON: a, NECTOCRANGON DENTATA 

 FROM AFOGNAK BAY, AFOGNAK ISLAND, x 39. b, NECTOCRANGON CRASSA FROM CAPE NEWENHAM, 

 ALASKA, x 20J. 



The inner pleopoda of the first pair are usually present; all the outer 

 pleopoda, the other four inner pleopoda, and the uropoda are not 



FIG. 591. ARGEIA PUGETTENSIS. SEVENTH LEG OF SPECIMENS FOUND ON: a, NECTOCRANGON ALASCEN- 

 SIS FROM SOUTHWEST OF SANNAKH ISLANDS. ALASKA. X 41. 6, CRAGO NIGROMAC TLATA FROM SAN 



DIEGO BAY, CALIFORNIA, x 41. c, CRAGO DALLI FROM SOUTH OF AMAK ISLAND, ALASKA, x 41. 

 d, CRAGO COMMUNIS PROM AKUTAN ISLAND, BERING STRAIT, x 41. 



