Bull. U. S. F. C. 1899. (To face page 492.) 
Plate II. 
0. Echinorhynchus sp. (a), from Lopholatilus chamseleonticeps. x 46. 
7. Proboscis of same, x 180. 
8. Echinorhynchus sp. (6), from same host, x 65. 
9. Proboscis of same, near apex, x 400. 
10. Proboscis of same, near base, x 400. 
11. Echinorhynchus fusiformis Zeder (?) , from Opsanus tau. x 65. 
a, Hooks of same, x 400. 
12. Echinorhynchus protnis Westrumb, from Cynoscion regcilis, longi- 
tudinal section of head and neck perforating intestinal wall of 
host. The mucous membrane {mm) is continuous over the 
head of the parasite, x 20. 
13. Section passing somewhat diagonally through neck of another 
parasite, also penetrating intestinal wall of same host, x 65. 
m, Muscular layer; mm , mucous membrane. 
