AET. 7 CESTODE PARASITES OF BIRDS LINTON 25 



1914, April 29. — Large number, 61 with scoleces; maximum 



length 34 mm., all immature. 

 1914, December 23. — Fragments representing about six strobiles, 



no scoleces. 

 1914, December 26. — Eleven strobiles, longest 135 mm., greatest 



breadth 1 mm., no scoleces. 



1914, December 30. — Four fragments, no scoleces. 



1915, September 1. — Three strobiles, and fragments, longest 90 

 mm., maximum breadth 1.12; one scolex; diameter of ovum 

 0.063, of onchosphere 0.039 ; length of embryonic hooks 0.014. 



1915, October 5. — Twenty-six, longest with scolex 50 mm. 



1915, November 1. — One, length 7 mm. 



1916, March 9.— Three, lengths 7, 12, and 50 mm. 



1916, December 19. — Three, short, rather plump, longest 15 mm. 



1919, January 27. — Five, 10 to 72 mm. in length ; no scoleces. 

 Lai^s atricilla: 



1908, August 27. — Four with scoleces ; ripe proglottides contain- 

 ing ova with six-hooked embryos. 



1911, July 21. — Fragments representing four strobiles, longest 

 about 100 mm. ; one scolex. 



U.S.N.M., Helm. Coll. 7869 (paratypes). 



1913, April 23. — Five with scoleces, many fragments, longest 

 about 50 mm. ; breadth 1 mm. 



1913, April 29. — One, scolex missing. 



1913, July 3. — One, scolex missing. 



1913, August 5. — Nine with, and four without scoleces ; all short 

 and somewhat clavate ; maximum length 9 mm. 



1914, July 30. — Four with scoleces and several fragments, maxi- 

 mum length 75 mm. 



(U.S.N.M., Helm. Coll. 7868.) (Type.) 



1915, August 13. — Two fragments 7 and 40 mm. in length ; maxi- 

 mum breadth 2; no scolex. 



1916, October 7. — Many fragments, longest 20 mm., maximum 

 breadth 1; no scolex. 



1916, October 28. — One, length 48 mm.; maximum breadth 0.6. 

 Larus delawarensis : 



1914, January 24. — One, length 48 mm. ; scolex missing. 

 Larus marinus: 



1904, January 19. — About seven strobiles, not all with scoleces; 

 maximum length 60 mm. 

 Larus Philadelphia: 



1906, November 16. — Two gulls examined, 15 worms found in 



older, none in younger. 

 1906, November 25. — One hundred and seventy strobiles from 

 two gulls. 



