ART. 7 CESTODE PAEASITES OF BIRDS — LINTON 1 67 



27. Mature proglottides ; length 0.70 mm., from Gavia immer. 

 28. Mature proglott is ; breadth 2.38 mm. 



29. Transverse section through genital cloaca ; dorso-ventral diameter 



0.53 mm. 



30. Transverse section of strobile near scolex ; circular muscle layer 



to cuticle inclusive, 0.16 mm. 



31. Longitudinal section of lateral margin of strobile showing varying 



position of outer longitudinal muscle layer with reference to the 

 cuticle ; length of proglottides about 0.45 mm. 



Plate 4 



Tetrabothrius sulcatus, new species from Fregata magnificens 



Fig. 32. Scolex and portion of strobile ; diameter of scolex 0.48 mm. 



33. Proglottides; breadth 0.40 mm. 



34. Proglottides from posterior end of strobile ; breadth 0.53 mm. 



35. Adult proglottis ; length 0.21 mm. 



36. Sagittal section of proglottides near poral margin ; dorso-ventral 



diameter 0.43 mm. 



37. Transverse section of ripe proglottis ; longer diameter 0.46 mm. 



38. Transverse section of proglottis in vicinity of genital pore; diameter 



of cirrus-pouch 0.048 mm. 



39. Frontal section through genital pore ; diameter of cirrus-pouch 0.065 



mm. 



Ophryocotyle protcus (Fries), from Larus atricilla 



40. Strobile ; length 3 mm. 



41. Scolex ; breadth 0.28 mm. 



42. Spines from rostellum ; length 0.004 mm. 



43. Spines from sucker ; length 0.008 mm. 



44. Proglottis ; length 0.28 mm. 



Dilepis unilateralis (Rudolphi) from Butorides virescens 



45. Scolex ; breadth 0.135 mm. 



46. Rostellum ; diameter, exclusive of hooks, 0.051 mm. 



47. Immature proglottis ; breadth 0.35 mm. 



48. Adult proglottis; breadth 0.50 mm. 



Plate 5 

 Dilep-is unilateralis (continued) 



Fig. 49. Ripe proglottis ; breadth 0.53 mm. 



50. Transverse section of proglottis ; 0.34 by 0.18 mm. 



51. Dorsal view of genital pore, from whole mount ; camera lucida drawing, 



Spencer 6/4 mm. 



Choanotaenia parina (Dujardin) from Passer domesticus 



52. Rostellum ; diameter 0.04 mm. 



53. Proglottis ; length 0.77 mm. 



