442 ALLAN HAXCOCK PACIFIC EXI'KDITIOXS VOL. 19 



PLATE 7 



Spirobranclius spinosus Moore (Isthmus Cove) 



1. Entire animal, in left lateral view, x 6.3. 



2. Operculum, in dorsal view, x 12.6. 



3. Thoracic uncinus, in lateral \ie\v, x 875. 



