ART. 1 TREMATODE PARASITES OF BIRDS LINTON 27 



ORNITHOBILHARZIA species 

 Figures 59-63 



1012. Odhnek, Zoolog. Anzeig., vol. 41, p. 61. 



From Lams argentatus, L. Philadelphia, Nycticorax nycticwax, 

 and Oideniia deglandi. 



Although this distome is a blood parasite, all of the worms here 

 considered appeared among material from the alimentary canals of 

 their hosts. No search was made in the blood vessels or gall bladders, 

 but in the process of removing and examining the viscera blood para- 

 sites might easily be liberated and appear in the washings from the 

 alimentary canal. 



In such characters as can be made out these worms from different 

 specific hosts are in close agreement. 



The female in all cases was enclosed in the gynaecophoric canal 

 of the male. In most cases it was shorter than the male, but in 

 one pair it appeared to be at least as long as the male. The oral 

 and ventral suckers are rather prominent, nearly circular, near to- 

 gether, the ventral somewhat larger than the oral. There is no 

 pharynx. The intestine, at first a single tube, bifurcates behind the 

 ventral sucker, the two rami uniting toward the posterior end of the 

 body. There is a tendency in the body of the male to coil helixwise. 

 In the male the testes were indicated as many but they were not 

 clearly defined. In the females only the vitellaria in the posterior 

 part of the body could be distinguished. 



On account of the unsatisfactory condition of the material specific 

 allocation does not seem to be advisable. 



Some additional details are given in the record of collections 

 from the several hosts. 



BECOKD OF COtrLECTIONS 



Lai-us argentaius. 



1912, February 16. 6 pairs; lengths 5 mm., more or less. 



1913, February 12. 2 pairs, the males 3.5 and 9 mm. in length, re- 



spectively. The larger male was roughly 

 tuberculate for a distance of about 2 mm., 

 beginning 0.7 mm. back of the oral sucker. 

 (Fig. 59.) (Cat. No. 7946, U.S.N.M.) 

 April 17. 1 pair; length of male 5.5 mm. 

 1915, February 18. 2 males. 



The above collections were made by Vinal 

 N. Edwards. 

 1920, December 18. 5 pairs. Collected by Koberl A. Goffin. 



Notes on specimens from the herring gull : Diameter of oral sucker 

 of male, average of 8 specimens, 0.19 mm., of ventral sucker, average 



