AKT. 1 TREMATODE PARASITES OF BIRDS LINTON 35 



Plate 6 

 Mesorchis psettdoecMnatus (Olsson) (continued) 



Fig. 38. Dorsal view of head ; diameter 0.32 mm., from Larus argentatus. 



39. Dorsal view of median region of body; breadtla 0.6 mm, 



40. Sagittal section, median region ; diameter of ventral sucker 0.22 mm. 



41. Ventral view of specimen from Colymbus holbolU; length 2.56 mm. 



42. Ventral view of specimen from Gavia immcr; length 2.20 mm. 



Aporchis rugosus, new species, from Sterna paradisea 



43. Ventral view of anterior portion of specimen ; diameter at ventral 



sucker 0.35 mm. 



44. Posterior portion of same ; diameter 0.77 mm. Uterus somewhat 



diagrammatic in this and the preceding figure. 



45. Ventral view of anterior end ; diameter at ventral sucker 0.35 mm. 



spines diagrammatic. 



Plate 7 



AporcJiis rugosus, new species (continued) 



Fig. 46. Camera lucida sketch of surface of body back of cirrus-pouch; 

 breadth 0.28 mm. 



47. Lateral margin at level of seminal vesicle ; length of spines 0.03 mm. 



48. Lateral margin at level of testes ; average length of serrations about 



0.07 mm. 



49. Ovum ; sketched from an ovum lying isolated from others in the 



metraterm ; dimensions, exclusive of filament, O.OS by 0.03 mm. 



Asoocotyle plana, new species, from Butorides virescens 



50. Ventral view; length 0.67 mm. 



Levinseniella adunca (Linton), from Croceth'ia alha 



51. Memorandum sketch made at time of collecting; tests and vitellaria 



added from stained specimen ; length 0.8 mm. 



Galactosomum cochleariforme (Rudolphi), from Fregata magnificens 



52. Ventral view, uterus diagrammatic, length 2.3 mm. 



Plate 8 

 Minuthorchis sanguineus, new genus, and new species, from Larus artrioilla 



Fig. 53. Ventral view, uterus somewhat diagrammatic ; length 8.8 mm. 



54. Anterior end of same ; transverse diameter of oral sucker 0.46 mm. 



55. Ventral view of ovary, etc., partly diagrammatic : ovary 0.56 by 



0.44 mm. 



56. Ova ; longer diameter 0.09 mm. 



