AKT. 7 CESTODE PARASITES OF BIRDS L,INTON 63 



vessels remained, the large vessel persisted, the two principal diame- 

 ters being 0.13 by 0.09 (fig. 197). 



The above description is based on material from Mergus sei^ator. 

 The agreement is close with F. fasciolaris^ as described by Wolff- 

 hiigel in his monograph.® None of the preparations reveal any spines 

 at the outlet of the vagina. Furthermore, the dimensions of the 

 hooks at the base of the cirrus are smaller than those recorded for 

 this species. 



RECORD OF COLLECTIONS 



Mergus setTator. 



(U.S.N.M., Helm. Coll. 7893.) 

 1903, November 5. — Ten fragments of strobiles, three with pseu- 

 doscolesces ; longest strobile with pseudoscolex 52 mm. ; length 

 of pseudoscolex 4.8 ; breadth back of pseudoscolex 0.78, at pos- 

 terior end 1.6; maximum breadth observed 3. 



1912, February 6. — One, length 50 mm. 



1913, November 7. — Nineteen with pseudoscoleces, and a few 

 fragments. Two of the longest measured 123 and 136 mm., re- 

 spectively, in length; maximum breadth 3. 



1914, February 20. — Three, and two fragments ; lengths of stro- 

 biles 21, 38, and 130 mm., of fragments 15 and 18 ; maximum 

 breadth 4, 



1914, February 21. — One, length 22 mm. 



1914, February 24. — Three, and a number of fragments, macer- 

 ated. 

 Oidemia deglandi, new host : 



1909, February 2. — Twelve strobiles with pseudoscoleces and 

 many fragments, all very irregularly contracted. These stro- 

 biles are linear and subcylindrical for the greater part of the 

 length, then enlarge abruptly near the posterior end, where 

 the greatest breadth observed was 5 mm. The pseudoscoleces 

 were much crumpled; the largest from 4.5 to 5 mm. ; maximum 

 length of strobile 55. 



1913, August 14. — One hundred and forty-five, from 3 to 10 mm. 

 in length; relatively short and broad; some of this lot are 

 F. fcdciforims. 



1913, September 4. — Ninety-two; some very small, 2 mm., or less, 

 in length. The longest strobile with pseudoscolex was 30 mm. 

 in length ; one, from which the pseudoscolex was missing, was 

 34 mm. in length ; maximum breadth 2.5. 



1913, NoA^ember 4. — Ten; some very small, 5 mm., or less; longest 

 40 mm. 



* Arbeit aus dem Universitat Basel, 1900. 



