36 PIIOCEEDIKGS OF THE NATIONAL MUSEUM vol.73 



Plate 9 

 Distomum species, from Oidemia perspicillata. (See A, p. 25.) 

 Fig. 57. Ventral view ; length 0.30 mm. 



Distomum species, from Oidemia perspicillata. (See B, p. 26.) 



58. Ventral view ; length 0.24 mm. 



Ornithoiilharsia species, from Lartis argentatus 



59. Anterior end of pair, neck of mule contracted ; diameter of male at 



ventral sucker 0.6 mm. 



60. Anterior end of female, dorsal view ; diameter of oral sucker 0.05 mm. 



61. Fragment of male with female : maximum diameter of male 0.52 mm. 



62. Dorsal view of male showing intestine; length 3.9 mm. 



Platej 10 



OrnithoMlharzia species (continued) 

 Fig. 63. Lateral view of pair ; length of male 3 mm. 



Proalaria indistincta (Guberlet), from Larus atricilla 



64. Sketch of specimen in alcohol, slightly compressed ; length 1.33 mm. 



65. Ventral view of mounted specimen ; length 1.22 mm. 

 6. Lateral organ. 



Alaria species, from Larus delaicarensis 



66. Fragment, anterior, ventral view; length 1.05 mm. 



67. Fragment, posterior; length 1.05 mm. 



Plate 11 

 Strigea hursigera (Brandes) 



Fig. 68. Lateral view of specimen from Larus atriciUa; length 6.3 mm. 



69. Ventral view of anterior end of specimen from Larus delaicarensis; 



breadth 1 mm. 



70. Sagittal section of anterior end of specimen from Larus argentatus ; 



diameter 0.56 mm. 

 71. Sagittal section, posterior end, somewhat diagrammatic ; diameter 0.56 



mm. 

 72. Posterior end of mounted specimen ; diameter 1.33 mm. 



o 



