Bull. U. $. f ■ C. 1899. (To face page 304.) 
Plate 38 . 
Distomum vibex sp. nov. from Spheroides maculatus. 
48. Ventral and lateral views of an alcoholic specimen, x 4. 
49. Median longitudinal vertical section, x 24. 
50. Transverse section through ovary and testes, x 54. 
51. Ovum, x 300. 
Distomum, pyriforme sp. nor. from Palin urichthys perciformis. 
52. Portion of section of pyloric caeca with distoma. 80. 
53. 54. Specimens showing some different forms, alcoholic. 50. 
55. Specimen with large caudal excretory vessel, life, x 176. 
56. Dorsal view. life, x 176. 
sr, Seminal receptacle (?); a', spherical bodies with concentric 
structure. 
57. Longitudinal horizontal section of anterior end, showing invag- 
inated oral sucker. ■ 330. 
58. Median longitudinal vertical section. 250. 
59. Acetabulum, cirrus, prostate, seminal vesicle, and ovum. 440. 
