94 CEYLON PEARL OYSTER REPORT. 



PLATE III. 



Fig. 32. Phyllobothnum minutum. x 20. 

 33. head, x 80. 



,, 34. Phyllobothnum pammicrum. x 10. 

 35. head, x 70, 



36. Tetrarhynchus carcharidis. x 20. 

 37. head, x about 40. 



38. Carpobothrium chiloscyllii. x 100. 

 39. single bothridium. x 150. 



,, 40. Anterior end of a Tetrarhynchus cyst from Chirocentrus dorab, enclosed in a secondary cyst formed 



from the tissues of the host, x 20. 

 40rt. The whole cyst, x 2. 



,, 41. View of the Tetrarhynchus when the cyst has been ruptured. 

 42. Very young Tetrarhynchus from Cybium guttatum, x 25, showing also shape and arrangement of 



teeth. 



43. Cyst of Tetrarhynchus from Cybium guttatum, highly magnified. 

 44. Tetrarhynchid cyst, x 30, from Diagramma, sp. 

 45. Head of Anthobothrium crispum. x 10. 



46. A few segments of AntJwbothrium crispum, x about 12, showing the characteristic L markings. 

 47. Head of Diagonobothrium asymmetrum. x about 30. 

 48. Head of Rhoptrobothrium myliobatidis. x about 66. 

 49. Tylocephalum dierama, the entire animal x 6, and two more highly magnified sketches of 



proglottides to show the extent of the overlap. 

 50. Head of Tylocephalum dierama. x about 60. 



PLATE IV. 



Fig. 51. Echeneibothrium javanicum. x 22. An enlarged view of the striated cuticle is shown to the left. 

 ,, 52. A sketch of the same from life, showing the bothridia divaricated. 

 ,, 53. Another sketch from life, showing the bothridia concentrated. 

 54. A single bothridium, showing the areolas. 

 55. A transverse section through the neck of the same, showing the fine excretory canal, the two 



nerve-cords, and bundles of muscles. 

 56. A transverse section through the head, showing the hollows of the four bothridia and their 



areolas. 

 57. Echinobothrium rhinoptera, magnified, p. penis ; p.h., enlarged view, the hooks of the penis ; 



s.r., spinous region. 



,, 58. Head of the same, more highly magnified. 

 59. Spine from the spinous region, very highly magnified. 

 60. Eniochobothriwn yracilc. x 30. Rather diagrammatic sketch from life. 

 ,, 61. The body of the same, x 30. Drawn from a preserved specimen. 

 ,, 62. More highly magnified view of head and anterior end of body of Eniochoce-pluilum gracile. 

 63. Tetrarhynchus unionifactor. x 8. a., enlarged view of a proboscis, showing arrangement of teeth ; 



I., a tooth still more enlarged. 

 64. The same, drawn when alive, showing the anterior meeting of the two bothridia and the apical 



emergence of the pvoboscides. 

 ,, 60. Tiambothrium javanicum. x 16. Drawn from a spirit specimen. 



