PLaTtE XXV * 
Fig. 17. Neoechinorhynchus cylindratus. Outline showing general body-form 
and size of fully mature female from intestine of Micropterus salmoides. Posi- 
tions of giant nuclei of subcuticula are indicated. Body completely filled with 
developing embryos, which obscure all internal structure. Hematoxylin-stained 
mount in damar. 
Fig. 18. Embryo from body-cavity of female shown in Fig. 17. 
Fig. 19. N. tenellus from intestine of Stizdstedion vitreum. Outline of gravid 
female, showing general body-form. Hematoxylin-stained whole-mount. in damar. 
Fig. 20. Embryo from body-cavity of specimen shown in Fig. 19. 
Fig. 21. Neoechinorhynchus emydis from intestine of Graptemys pseudo- 
geographica. Outline showing general body-form of gravid female with body- 
cavity completely packed with embryos. 
Fig. 22. Optical section of immature male of same species. A comparison 
of this figure with the preceding one shows how slightly the increase in body 
size due to growth modifies the general body-form. 
Fig. 23. Embryo from body-cavity of gravid female of same species. 
* Scales indicating magnification of Fig. 17, 19, and 21 have a value of 1 mm.; all 
others in the plate have a value of 0.05 mm. 
