10 



PROOBEDINGS OF THE NATIONAL MUSEUM 



TOL. 78 



RECORD OF COLLECTIONS 



Larus argentatus. 

 1912, February 16. 



1913, January 

 November 



17. 



19. 

 30. 

 3. 

 17. 

 21. 



1914, January 



10. 

 22. 

 September 10. 



25. 



28. 



2. 



30. 10 mm., more or less. 



1, and fragment. 



1. 



4. Two of these were exceedingly slender, 15 

 and 20 mm. in length respectively, filiform 

 for a good part of the length. 



1. 



12. 



385. The largest, in sea water, measured 8 

 mm. in length and 0.65 in breadth. A small 

 immature specimen measured 1.27 in length 

 and 0.60 in breadth. 



3. Maximum length, in formalin, 8.5. 

 Number not recorded, slender, linear from 5 to 



15 mm. in length. 

 267, young and adult. 



4, young. 



I. Length in formalin 5.25, maximum diam- 

 eter, at level of testes, 0.56. 



4, maximum 7 mm. 



II. Attenuated, longest 11.5 mm. 



I and fragment. 

 69 and a few fragments. 



II and fragments. 

 129, largest, in alcohol, length 7 mm. Collected 



by R. A. Goffin. (Cat. No. 7921, U.S.N.M.) 



DiflFerences in length of adult worms are due mainly to the degree 

 of development of the uterus. 



This is shown by the following measurements made on four speci- 

 mens in which ova had made their appearance in the uterus, which is 

 limited to the space between the ventral sucker and the ovary. 



