The Sexual Phases of Myzostoma. 
301 
Fìg. 20. Horizontal section through the region of the ovaries in a specimen of 
M. glahrum 1.25 mm long. Specimen attached to the disc of the An- 
tedon. GUNDLACH obj. l^/s inch; Zeiss oc. 3 = 100 x. 
Fig. 21. Transverse section through one of the ovaries of Fig. 19 enlarged. Zeiss 
hom. immers. V12; oc. 1 = 385 x. 
Fig. 22 a — e. Five oogonia of M. glahrum dividing. Zeiss hom, immers. Vj^; 
oc. 3 = 730 X. 
Fig. 23 a— h. Seven stages in the development of the oocyte of 31. glahrum. 
hardened in corrosive sublimate. Zeiss hom. immers. V12; oc. 3 = 730 x. 
Piate 11. 
M. glahrum Figs. 24 and 25; M. platypus Figs. 26—30; M. halli Figs. 31—34; 
M. cryptopodiiim 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 Antedo7i. 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. 
Fig. 26. Dorsal view { c -^r i j. m 
T^. TT . 1 . } of Jf. piati/pus. 10 X. 
Fig. 27. Ventral view \ ^ 
Fig. 28. Transverse section through the middle of the body of M. platijpus. 
GuNDLACH obj. 1 inch; Zeiss oc. 3 = 45 x. 
Flg. 29. Sagittal section of one of the segmentai sacs of M.platypus. Gundlacii 
obj. 12 3 inch; Zeiss oc. 2 = 65 x. 
Fig. 30. Portion of the boss of the sac represented in Fig. 29 more highly 
magnified. Zeiss hom. immers. 1/12; oc 2 = 530 x. 
Fig. 31. Dorsal view ) c ut t n- ìa 
T^- TT . T . \ oi M. halli, n. sp. 10 x. 
Fig. 32. Ventral view j ' ^ 
Fig. 33. Transverse section through the region of the ovaries in 'M. halli. 
GuNDLACH obj. 1^3 inch; oc. 2 = 65 x. 
Fig. 34. Transverse section of ano vary of Jf. halli. Zeiss obj. E.; oc. 2 = 390 x. 
Fig. 35. Lateral view ) . nr ^ j- -ia 
■E,. oc T^ 1 • ^ of 31. cryptopodium. n. sp. 10 X. 
Fig. 36. Dorsal view ) ^ 
Fig. 37. Transverse section through the region of the ovaries of 31. cryptopo- 
dium. GuNDLACH obj. 173 inch; Zeiss oc. 1 = 50 x. 
Piate 12. 
31. halli Fig. 38; 3£. aremita Figs. 39 and 40; 3f. pulvinar Figs. 41—50; Distoma 
myzostoìnatis Fig. 51; Amoaha tnyzostoìnatis Figs. 52 — 56. 
Fig. 38. Section through the ovary of 3f. halli. Zeiss obj. E.; oc. 2 = 390 x. 
Fig. 39. Dorsal view ì . 
Fig. 40. Ventral view ( 'P' 
Fig. 41. Dorsal view of an adult specimen of 31. pulvinar with two young at- 
tached at^wy. 10 X. 
Fig. 42. Ventral view of the same specimen showing one young individuai at- 
tached. 10 X. 
