130 NEW GTEODACTTLOID TREMATODES PROM AUSTRALIAN FISHES, 



Figs. 21-22. Dadtreosoma bancrofti. 

 21. Reproductive organs ; 22. Head. 



Figs. 23-25. Acleotrema girellae. 

 23. Portion of disc viewed from ite anterior side, to show articulation of major 

 hooks. Three minor hooks are also shown ; 24. Entire animal showing its capacity 

 for great elongation; 25. Disc in ventral view. 



Plate xiv. 



Figs. 26-30. Acleotrema girellae. 



26. Entire animal; 27. Entire animal, showing excretory and digestive systems; 



28. Skin papillae; 29- Genital organs of adult; 30. Genital organs from young 



animal. 



Fig. 31. Empleuroeoma pyri forme. 

 Transverse section through anterior end. 



Plate XV. 

 Figs. 32-34. Emplenrosoma pyriforme. 

 32. Entire animal; 33. Anterior end; 34. Transverse section of intestine. 



Figs. 35-37. Lepidotrema therapon. 

 35. Entire animal; 36. Anterior end; 37. Egg. 

 Plate xvi. 

 Figs. 38-42. Lepidotrema therapon. 

 38. Male reproductive organs; 39. Cirrus; 40. (a) Disc, ventral view; (b) Disc, 

 lateral view; (c) Ventral major hook; (d) Dorsal major hook; (e) Basal supporting 

 apparatus; (f) Toothed-disc (squamodisc) ; 41. Young animal; 42. Disc, to show 

 arrangement of minor hooks. Those of dorsal side are blackened; those of other 

 side not so. 



Fig. 43. L. tenue. 

 Disc. 



Fig. 44. L. fuliginosum. 

 Disc. 



N.B. Figs. 42, 43, 44 are drawn in approximately identical positions, 

 in order to show the relative positions of the minor hooks. 



Plate xvii. 

 Figs. 45-49. Lepidotrema therapon. 

 45. Longitudinal vertical section through posterior region, to show the great ac- 

 cumulation of yolk; 46. Longitudinal vertical section through entire animal; 47. 

 Transverse section of male and female repioductive organs; 48. Transverse section 

 through anterior end, in region of pharynx ; 49. Transverse section in region of shell- 

 glands. 



Figs. 50-51. Lepidotremn fuliginosum. 

 50. Reproductive organs; 51. Opening of vagina and transverse vitelline tubes 

 into female duct. 



Plate xviii. 

 Figs. 52-53. Lepidotrema tenue. 

 52. Entire animal; 53. Reproductive organs. 



Figs. 54-55. Flabellodiseus simplex. 

 54. Reproductive organs; 55. Nervous system. 

 Plate xix. 

 Figs. 56-60. Empleurodiscus angtostus. 

 56. Entire animal; 57, Transverse section in region of transverse yolk-duct; 58. 

 Cirrus with "prostate" gland; 59. Egg: 60. Head end, showing partial projection 

 of "head-organs." 



