ENTOZOA OF MARINE FISHES. 
539 
EXPLANATION OF PLATES. 
Plate I. 
Echinorhynchm acas, Rudolph i. 
Fig. 1. Specimen from Prionotus evolans; portion of proboscis magnified about 200 
diameters. 
Fig. 2. Posterior end of male, lateral view of bursa, X 24. 
Fig. 3. Terminal view of bursa, X 24. 
Fig. 4. a, Ovariau mass, and b, ovum of a specimen from Pseudopleuronectes ameri- 
canus ; X 200. 
Fig. 5. Embryos from same, X 200. 
Fig. G. Hooks from proboscis, from same, X about 200 diameters. 
Fig. 7. Hooks from proboscis of specimen from Melanogrammw wglefinus, X 200. 
Fig. 8. a, Ovum; b } embryo from same; X 200. 
Fig. 9. Longitudinal section of proboscis sbeatb of specimen from P. americanus ; 
a, outer muscular wall ; b, inner muscular wall ; c, nerve ganglion. The 
ganglion is situated a little back of the middle of the proboscis sbeatb; 
specimen killed with osmic acid, and stained with Burner’s haematoxylon ; 
X 225. 
Fig. 10. Transverse section of body wall; a, layer of longitudinal muscle fibers; b, 
layer of circular muscle fibers ; c, longitudinal canals of the subcuticula ; 
<?,/, granular and fibrous layers of the subcuticula; g, vascular radial 
layer of the subcuticula; h, nuclei of the vascular layer; osmic acid and 
borax carmine preparation ; X about 300 diameters. 
Fig. 11. Transverse section through proboscis sbeatb andlemnisci, with two portions 
of the body wall. The difference in thickness in different parts of the 
circumference of the same section, here shown, is characteristic of the 
anterior region of the body, a, a, longitudinal muscle layer, enveloping 
the lemnisci ( e , e ) and forming the mantle of the lemuisci ; b, outer, and c, 
inner muscular wall of the proboscis sheath; d, retractor muscle of the 
proboscis; e, e, mantle of the lemnisci, /,/, lemnisci ; g, g, longitudinal 
canals of the lemnisci; h, h, longitudinal canals of the subcuticula; i, i, 
longitudinal muscle layer of the body wall; k, k, circular muscle layer; 
l , l, vascular (radial muscle) layer of subcuticula ; m, m, cuticle ; n, n, o, o, 
granular and fibrous layers of subcuticula. There are both circular ana 
longitudinal fibers in these layers; osmic acid and Czoker’s cochineal 
preparation ; X about 375 diameters. 
For longitudinal section of body wall and nerve ganglion see plate vm, figs. 
89 and 90. 
Sketches by the author. 
Plate II. 
Echinoj'hynclms thecatus, sp. nov. 
Fig. 12. Optical section of a male specimen, rendered transparent by potaSsic hy- 
drate, X about 27 diameters; a, sheath; b, b, b, lemuisci; c, retractor 
muscles of sheath; d , d, testes ; e, prostatic glands; /, vas deferens ; g, 
ejaculatory duct ; h, bursa. 
Fig. 13. Proboscis, X about 40 diameters. 
Fig. 14. a, sheath, and b, b, lemnisci isolated, X about 14 diameters. 
Fig. 15. View of lateral longitudinal subcutaueous vessel with its immediate 
branches. Specimen treated with potassic hydrhte. 
Fig. 16. Hook with theca after lying 18 hours in a strong solution of potassic hydrate, 
X about 200. 
Fig. 17. Hook from ventral, i. e., concave, side of j>roboscis, X 200. 
Fig. 18. Hooks from dorsal, i. e., convex, side of proboscis, X 300. 
Fig. 19. Hook from ventral side of proboscis, near base, X 200. 
Fig. 20. Hook from dorsal side of proboscis, after lying 24 hours in strong solution of 
potassic hydrate, X 200. 
Fig. 21. Embryo, treated with potassic hydrate, X 200. 
Fig. 22. Male with bursa everted and proboscis partly invaginated, X about 8 
diameters. 
Sketches by the author. 
