1)4 CEYLON PEARL OYSTER REPORT. 



PLATE III. 

 Phyllobothrium minutum. x 20. 



head, x 80. 



Phyllobothrium pammicrum. x 10. 



head, x 70. 



Tetrarhynchus carcharidis. x 20. 



head, x about 40. 



38. Carpobothrium chiloscyllii. x 100. 



39. ,, single bothridium. x 150. 



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

 from the tissues of the host. x 20. 



40. The whole cyst, x 2. 



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



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

 teeth. 



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



44. Tetrarhynehid cyst, x 30, from Diagram-ma, sp. 



45. Head of Anthobothrium crispum. x 10. 



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



47. Head of Diagonobothrium asymmetrum. x about 30. 



48. Head of Rhoptrobothriurn myliobatidis. x about 66. 



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

 proglottides to show the extent of the overlap. 



50. Head of Tylocephalim dierama. x about 60. 



PLATE IV. 



E'-ln /irilnHiriiiiii jiiraiiinini. x 22. An enlarged view of the striated cuticle is shown to the left. 

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

 Another sketch from life, showing the bothridia concentrated. 

 A single bothridium, showing the areolas. 



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. Erhiiwhiitliriirm rhiitojitera, 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. Eniochobothrium gracile. 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 Eniochoceplialum gracile. 



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



/., 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 proboscides. 



65. Tiarabothriwm javuniewm. x 16. Drawn fiom a spirit specimen. 



