U. S. B. F. — Doc. 890. 



Plate VI. 







FIG. 1.— STARFISH ATTACKING AN OYSTER. 

 (Photo from Dr. H. M. Smith.) 



FIG. 2.— PHOTOGRAPH OF OYSTER SHOWING THE TURBELLARIAN WORM 

 KNOWN AS THE WAFER OR "LEECH." 



The worm has fastened itself upon the oyster and appears as a dark wrinkled body in about 

 the center of the oyster meat. Natural size. (After Danglade.) 



