[cooper] TREMATODES FROM MARINE FISHES 205 



Plate I. 



Fig. 1. Dorsal view of Microcotyle poronoti: p, pigment fleck; s, posterior suckers, 

 X30. 



Fig. 2. Outline view of same from the right side, X30. 



Fig. 3. Coronal section through genital atrium: ns, nerve strand; Imb, longitudi- 

 nal body muscles; svd, sphincter of vas deferens, X200. 



Fig. 4. Dorsal view of ovary and ducts in the immediate neighbourhood: ot, ootype; 

 cgi, canalis genito-intestinalis; od, oviduct, X85. 



Fig. 5. Enlarged view of a posterior sucker, X500. 



Plate II. 



Fig. 6. Dorsal view oi Sinistroponts simplex: 5g, shell gland, X25. 

 Fig. 7. Left lateral view of a 13- 5mm. specimen of Hinidinclla clavata, XI. 

 Fig. 8. A, left lateral view, B, ventral, of largest specimen of same species, Xl. 

 Fig. 9. A, ventral view of Brachyphallus crenatus: paf, preacetabular fossa; ntt, 



metraterm; app, appendage, B, the left vitelline gland, seen from the 



left side, C, right, seen from the right side, X60. 

 Fig. 10. Ventral view of Gyrodactylus médius: ap, anterior papilla; e^n, embryo, 



XIOO. 

 Fig. 11. A, Ancyrocephalus paradoxus, seen obliquely from the right side; B, 



ventral view of posterior disc, respectively XlOO and X300. 

 Fig. 12. A, Ancyrocephalus cruciatus, ventral view; B, same of posterior disc, 



respectively X 100 and 300. 

 Fig. 13. Cyst of Tocoirema lingua, from gills of Sea-Raven, X ? 

 Fig. 16. Small encysted Crepidostomun laureatum from nymph of Hexagenia, 



XIOO. 



Plate III. 



Fig. 14. An example of the same species iromBoleosoma nigrum, ventral view, X50. 



Fig. 15. Ventral view of a small Crepidostomum cornutum irom Ambloplites rupestris, 

 X50. 



Fig. 17. Ventral view of Azygia acuminata, X6. 



Fig. 18. Same oi Allocreadiumcommtine irom gall-hladderoi Notropis cornutus, X55. 



Fig. 19. Very young encysted Cryptogonimus chyli from young M. dolomieu, XIOO. 



Fig. 20. Older specimen of same inside of cyst, XlOO. 



Fig. 21. One of the largest removed from cysts: aev, anterior expansion of excretory 

 vesicle; vs, ventral suckers, XlOO. 



Fig. 22. Ventral view of Gasterostomum pusillum from intestine of small Small- 

 mouthed Black Bass: os, oral sucker, XlOO. 



Fig. 23. Same of a very young encysted specimen of same species, XlOO. 



Fig. 24. Cyst containing larval distome from muscles of Yellow Perch, X ? 



Fig. 25. Cyst containing Cercaria sp. ? from skin of a Minnow, sp. ?, X ? 



Fig. 26. A, ventral view of the worm removed from the cyst; B, left lateral view 

 of same, X ? t^v 



