420 BULLETIN OF THE BUREAU OF FISHERIES. 



PLATE V. 

 Heterakis sp. From drum (Scisenops ocellatus). 

 Fig. 25. Anterior end. Life; X 315. 



Immature nematodes (Ascaris). 



Fig. 26. — Anterior end of specimen from flounder (ParaJichthys albigutlus), showing junction of 



oesophagus and intestine. Life; X 540. 

 Fig. 26a. — Posterior end of same, lateral view. Life; X 315. 

 Fig. -7. — Specimen from toad-fish (Opsanustau). Life; X 315. 

 Fig. 28. — Another specimen from same host. Actual diameter at base of oesophagus, 0.4 mm. Probably 



the young of Ascaris habena. 

 Fig. 29. — Anterior end of specimen from par ( Tylosurus raphidoma). Life; X 50. Same type as that 



shown in Figs. 27 and 28. 

 Fig. 30. — Posterior end of same. Life; X 210. 



PLATE VI. 



Immature nematodes (Ascaris). 



Fig. 31. — Specimen from flounder (Paralichthys albiguttus). In this type the bulbous base of the 



oesophagus is elongated and without diverticulum. 

 Fig. 32. — Posterior end of another specimen of same type. Life; x 315. 

 Fig. 33. — Two specimens and three calcareous bodies in cyst from black sea bass (Centroprislis strkUus). 



Life; > 50. 

 Fig. 34. — Cyst, containing young nematodes from body cavity of blue-fish (Pomatomus saltatrix). 



Actual length of cyst, 1.44 mm. 

 Fig. 35. — Small nematode from spot (Leiostom.ua xanthurus); posterior end of male. X 525. 



. PLATE VII. 



Minute nematodes from spot (Leistomus xanthurus). 



Fig. MO. — Female, collected August 18, 1902. Actual length, 1 mm. 



FlG. 37. — Enlarged view of head of same. 



Fig. 38. — Male from same lot. Actual length, 1 mm. 



Fig. 39. — Enlarged view of same. 



Fig. 10. — Female, same host, collected July 8, 1902. Actual length, 1.2 mm. 



I'k.. 41. — Anterior end of same, lateral view. X 525. 



Fig. 42.— Posterior end of male. X 300. 



Fig. 43. — Male, different species from foregoing, lateral view of head. Actual length of specimen, 



about 3 mm. 

 Fio. 44. — Copulatory spines of same. X 170. (See Fig. 51.) 

 Fig. 45. — Another species from same host, collected July 25, 1902; female. Actual length, 2 mm. 



PLATE VIII. 

 Minute nematodes. 



Fig. 40. — Female, enlarged view of head of specimen from Lriostomus xanthurus sketched in Fig. 45. 



Actual diameter behind spines, 0.03 mm. 

 I'io. 47. — Outline of posterior end, lateral view of same. Diameter at anal aperture, 0.04 mm. 

 Fig. 48. — Outline of posterior end of male from Leioslomus xanthurus. The head of this specimen was 



like that sketched in Fig. 40; from lot collected July 29, 1902. X 300. 

 In.. 40. — Small nematode agreeing with specimen from spot, Fig. 40, but from silver jenny (Eucinostomus 



guta). Diameter at a;, 0.1 mm. 

 Fig. 50. — Lateral view of posterior end of male from same lot. Diameter at anal aperture, 0.70 mm. 

 I'm. 51. — Outline of specimen from Leiostomus xanthurus shown in Figs. 43 and 44. X 40. 



