The Sexual Phases of Myzostoma. 
301 
Fig. 20. Horizontal section throiigh the region of the ovaries in a speciraen of 
M. glahrum 1.25 mm long. Specimen attached to the disc of the An- 
tedon. Gundlach obj. I 2/3 inch; Zbiss oc. 3 = 100 x. 
Fig. 21 . Transverse section through one of the ovaries of Fig. 19 enlarged. Zeiss 
hom. immers. Vi 2 i oc. 1 = 385 x. 
Fig. 22 a — e. Five oogonia of M. glahrum dividing. Zeiss hom. immers. V 12 ; 
oc. 3 = 730 X. 
Fig. 23 a— h. Seven stages in the development of the oocyte of M. glahrum^ 
hardened in corrosive Sublimate. Zeiss hom. immers. V 12 ; oc. 3 = 730 x. 
Plate 11. 
Jf. glahrum Figs. 24 and 25; M. platypus Figs. 26—30; M. helli Figs. 31 — 34; 
M. cryptopodium Figs. 35 — 37. 
Fig. 24. Horizontal section through the ovary and adjacent body-cavity rami- 
fications of M. glahrum, showing the migration and attachment of the 
ova. Length 1.25 mm; specimen from the disc of the Antedon. Zeiss 
obj. D.; oc. 3 = 325 x. 
Fig. 25. Transverse section through the middle of the body of a specimen of 
M. glahrum 0.35 mm long, attached to the back of an older Myzostome. 
Zeiss obj. D.; oc. 3 = 325 x. 
26. Dorsal view 
27. Ventral view 
yig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
of M, platypus. 10 x. 
28. Transverse section through the middle of the body of M. ylatyyus. 
Gundlach obj. 1 inch; Zeiss oc. 3 = 45 x. 
29. Sagittal section of one of the segmental sacs of M. platypus. Gundlach 
obj. 12'3 inch; Zeiss oc. 2 = 65 x. 
30. Portion of the boss of the sac represented in Fig. 29 more highly 
magnified. Zeiss hom. immers. 7i2; oc 2 = 530 x. 
31. Dorsal view \ o -nr -l n- 
^ , > of Jf. helli, n. sp. 10 X. 
32. Ventral view j ^ 
33. Transverse section through the region of the ovaries in ilf. helli. 
Gundlach obj. 12/3 inch; oc. 2 = 65 x. 
34. Transverse section of ano vary of M. helli. Zeiss obj. E.; oc. 2 = 390 x. 
35. Lateral view ) ^ ^ t 
, . ) Ol M. cryptopodium. n. sp. 10 x. 
36. Dorsal view j ^ 
37. Transverse section through the region of the ovaries of M. cryptopo- 
dium. Gundlach obj. D/s inch; Zeiss oc. 1 = 50 x. 
M. helli 
Fig. 38. 
Fig. 39. 
Fig. 40. 
Fig. 41. 
Fig. 42. 
Plate 12. 
Fig. 38; M. eremita Figs. 39 and 40; M. pulvinar Figs. 41 — 50; Distoma 
myzostomatis ' Fig. 51 ; Amoeha myzostomatis Figs. 52 — 56. 
Section through the ovary of M. helli. Zeiss obj. E.; oc. 2 = 390 x. 
Dorsal view ) x. 
Ventral view ) ^ 
Dorsal view of an adult specimen of M. pulvinar with two young at- 
tached at juv. 10 X. 
Ventral view of the same specimen showing one young individual at- 
tached. 10 X. 
