PLATE XXIII * 
Fig. 5. Echinorhynchus salvelini. Embryo from body-cavity of gravid female, 
showing very long polar prolongations of middle membrane. 
Fig. 6. Hchinorhynchus coregoni. Embryo from body-cavity of gravid female, 
showing short polar prolongations of middle membrane. 
Fig. 7. Pomphorhynchus bulbocolli. Optical vertical section of immature 
male taken from intestine of Ameiurus nebulosus. Whole mount, stained with 
hematoxylin and mounted in damar. 
Fig. 8. P. bulbocolli. Embryo from body-cavity of gravid female taken from 
intestine of Jctiobus urus. 
Fig. 9. Rhadinorhynchus tenuicornis. (Van Cleave, 4918a.) 
* Scales indicating magnification have a value of 0.05 mm. in all figures except 
Fig. 7, in which the scale-value is 1 mm. 
