302 
W. M. Wheeler, The Sexual Phases of Myzostoma. 
Fig. 43. Youug M. pulvinar (functional male) taken from the back of a large 
specimen and mounted in balsam. 13 x. 
Fig. 44. Transverse section of a M. piilvinar 2.5 mm long, through 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 M. pulvinar (functional male) 0.7 mm 
long, in which there are as yet no traces of ovaries or nephridia. 
Gundlach obj. 12/3 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. 
inch; Zeiss oc. 3 = 100 x. 
Fig. 48. Transverse section through a young specimen of M. pulvinar 0.8 mm 
long. Hermaphrodite stage. Gundlach obj. 12/3 inch ; Zeiss oc. 3 = 100 x. 
Fig. 49. The ovaries of Fig. 48 enlarged. Zeiss hom. immers. obj. V 12 ; oc. 2 
= 530 X. 
Fig. 50. Transverse section through the intestine of a young 31. 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 
Amoeba myzostomatis in the process of perforating them. Zeiss hom. 
immers. obj. V 12 ; oc. 3 = 730 x. 
Fig. 56. Section of the ovary of 3£. glahrum, showing two free Amoebae. Zeiss 
hom. immers. obj. V 12 ; oc. 3 = 730 X. 
Fig. 57. Diagram to illustrate the sexual phases of 3£. glahrum and allied 
species. For explanation see pages 288 and 289. 
Fig. 58. Diagram to illustrate the sexual phases of M. pulvinar and the cysti-* 
colous Myzostomidae. Eor explanation see page 289. 
University of Chicago, 111., U. S. A., June 1®*, 1895. 
