on 
ae PROCEEDINGS OF THE NATIONAL MUSEUM. Tid 
PLATE VY. 
Echinorhynchus striatus Goetze, from Gidemia americana. 
- Fig. 18. Optical outline of male, x 45. 
Fig. 19. Outline of another from same lot, x 24. 
- Fig. 20. Caudal spines, x 225. 
‘ Fig. 21. Hooks of proboscis, x 225. a, apical and b, basal of one specimen ; c, apical 
: and d, basal of another. 
Fig. 22. Female with embryos, x 15. 
Fig. 23. Apex of proboscis of same, X 225. 
_ Fig. 24. Dermal spines of same, x 225. 
- Fig. 25. Marginal view of dermal spines, x 225. 
Holostomum variabile Nitzsch, from Circus cyaneus var. hudsonius. 
‘Fig. 26. Lateral view, x 21. a, anterior aperture, b, posterior aperture. The specimen 
is concave on the dorsal side. 
Fig. 27. View of anterior end, X %7. The dorsal side is uppermost in the sketch. 
Fig. 28. Longitudinal vertical section, xX 42. a, anterior aperture; b, posterior 
aperture, into a muscular, suctorial organ; c, ejaculatory duct; there 
does not appear to be a true cirrus ; p, papilla at the summit of which the 
ejaculatory duct and the uterus lie as a common duct. The papilla and 
muscular sucker probably constitute a copulatory organ. ep, seminal 
vescicle, corresponding to a bursa penis; vsa. and vsp. anterior and pos- 
terior seminal receptacle ; ¢t, testes; v, aperture of vagina; 0, germ gland 
or ovary; gd, germ duct; cd, common duct, which passes around the an- 
terior testis, and between the two testes receives the vitolline duct yd’; 
sg, shell gland; w, origin of uterus; u’, uterus near posterior end; yd, one 
of the two longitudinal vitelline ducts; vg, vitelline or yolk gland; ov, 
ova in anterior uterine spaces; 0’, ova in posterior portion of uterus; s, 
ventral sucker, see Fig. 29, 3; x, glandular organ, the kiigliger korper of 
Von Linstow. 
Sketch from a single section, but the ducts represented by v, cd, and yd’ 
somewhat diagrammatic. Transverse sections of the convoluted common 
germ duct are shown between the testes. 
Fig. 29. Longitudinal vertical section of the anterior division of the body, several 
sections removed from that shown in Fig. 28, x 52. m, mouth surrounded 
by a muscular suctorial organ and communicating by a short passage with 
the muscular pharnyx ph; i, intestine which is bifurcate in front of the 
ventral sucker 8, a lateral branch passing on either side of that organ; dm, 
dorsal longitudinal muscles ; Im, lateral longitudinal muscles; vm, ventral 
longitudinal muscles; vg, vitelline glands ; y, section of invaginated fold, 
apparently an organ of absorption; a, anterior aperture. 
PuLaTE VI. 
Holostomum variabile Nitzsch. 
Fig. 30. Cells of germ gland or ovary, x 360. 
Fig. 31. Section of segmenting ovum, x 375. 
Fig. 32. Transverse section of vitelline duct near its union with the common germ 
duct, showing the peculiar arrangement of yoik globules, x 360. 
Distomum (?) verrucosum, sp. nov., from Larus californicus. 
Specimen coiled in a spiral, x 15. 
Anterior end of same specimen, X 24. 
Fragwent, X 15. Thetubercles are somewhat more enlarged. 
