302 W. M. Wheeler, The Sexual Phases of Myzostoma. 
Fig. 43. Youüg M. pulvinar (functional male) taken from the back of a large 
specimen and mounted in baisam. 13 x. 
Fig. 44. Transverse section of a M. puluinar 2.5 mm long, throiigh the region 
of the ovaries. Gundlach obj. 1 inch; Zeiss oc. 3 = 45 x. 
Fig. 45. Transverse section of one of the ovaries of Fig. 44 enlarged. Zeiss 
obj. D ; oc. 2 = 240 X. 
Fig. 46. Transverse section through a young 31. pulvinar (functional male) 0,7 mm 
long, in which there are as yet no traces of ovaries or nephridia. 
GuNDLACH obj. l'Vs inch; Zeiss oc. 2 = 65 x. 
Fig. 47. Transverse section through a young [specimen of M. pulvinar 0.825 mm 
long. Eamifications of the intestine appearing. Gundlach obj. l^/s 
inch; Zeiss oc. 3 = 100 x. 
Fig. 48. Transverse section through a young specimen of il^f, pulvinar 0.8 mm 
long. Hermaphrodite stage. Gundlach obj. 1 2/3 inch; Zeiss oc. 3 = 100 x. 
Fig. 49. The ovaries of Fig. 48 enlarged. Zeiss hom. immers. obj. V12; oc. 2 
= 530 X. 
Fig. 50. Transverse section through the intestine of a young M.pulvinar 0.825 mm 
long, showing the nephridia. Zeiss hom. immers. 1/12; oc. 2 = 530 x. 
Fig. 51. Piece of a section through the pharynx of M. platypus, showing two 
young specimens of Distoma myzostomatis. Zeiss obj. D.; oc. 2 = 240x. 
Figs. 52 — 55. Sections of eggs from the body-cavity of M. glahrum, showing 
Amoeha myzostomatis in the process of perforating them. Zeiss hom. 
immers. obj. V12; oc. 3 = 730 x. 
Fig. 56. Section of the ovary of M. rjlahrum, showing two free Amoebae. Zeiss 
hom. immers. obj. V12; oc. 3 = 730 X. 
Fig. 57. Diagram to illustrate the sexual phases of M. glabrum and allied 
species. For explanation see pages 288 and 289. 
Fig. 58. Diagram to illustrate the sexual phases of M. pulvinar and the eysti- 
colous Myzostomidae. Eor explanation see page 289. 
University of Chicago, III., U. S. A., June P*, 1895. 
