ART. 7 CESTODE PAK^SITES OF BIRDS LINTON 57 



1911, September 1. — Some of the slender strobiles noted but no 

 scoleces seen. 



1914, February 21. — Few; length of longest 60 mm.; maximum 

 breadth 0.38; diameter of scoleces 0.31 to 0.53 (formalin). 



191G, July 4. — Over 214 with scoleces, and at least as many 

 strobiles from which the scoleces were missing. Most of the 

 mature strobiles from 25 to 40 mm. in length; one, much 

 attenuated, 85 mm. in length; diameter of scoleces 0.56, or 

 more ; maximum breadth of strobile 1 mm. 



DIOICOCESTUS FUHRMANNII Linton 



Examples of this separate-sexed cestode were collected by Vinal N. 

 Edwards in the Woods Hole region from two species of grebe. 



Fuhrmann noted as a characteristic of the different species of this 

 genus that a male and a female strobile are always to be found 

 together. 



As was noted in the original description of this species,* the same 

 characteristic is indicated by most of tlie material in this collection. 

 There are, however, two dates on which a single specimen is recorded. 

 In the absence of detailed notes made at the time of the preliminary 

 examination of the material these records should be regarded as 

 incomplete. In all cases where two strobiles can be referred without 

 doubt to the same host, the female is the larger. 



RECORD OF COLLECTIONS 



From Golyrribus auritus: 



1913, April 28. — One female strobile ; length 190 mm., maximum 

 breadth 8.5 mm., maximum thiclmess 4.5 mm. Sections were 

 made of the posterior end of this strobile. The seminal 

 receptacles were found to be full of sperm cells, thus indicating 

 that at least one male strobile had been present in this host 

 contemporaneously with the female strobile which was 

 collected. 

 Colymbibs holboelli: 



(U.S.N.M., Helm. Coll. 7890.) 



1904, February 24. — Two birds examined ; two strobiles ; lengths 

 196 and 164 mm., respectively; maximum breadths 5 and 3 

 mm., respectively. 



1904, February 25. — Two strobiles; length 264 and 140 mm., 

 maximum breadths 6.5 mm. 



1904, March 5. — Two birds examined ; four strobiles ; length 132, 

 45, 245, and 94 mm., maximum breadths 7.5, 7, 8, and 8 mm. 



* Jouinal of I'arasitology, vol. 11, pp. 1G3-1G9. 



