b PROCEEDINGS OF THE NATIONAL MUSEUM vol.70 



RECORD OF COLLETIONS 



Colynibus holboelli^ new host : 



1910, April 17. — 2, flat, thin, tapering to the posterior end, where 

 the breadth was 2 mm.; length of one 72 mm., maximum 

 breadth 6; length of the other 116, maximum breadth 7. 

 Podilyrribus podiceps : 



1903, November 13. — 5, from 40 to 115 mm., in formalin. In 

 all but one the maximum breadth was 4 mm., in one it was 

 6 mm. 



(U.S.N.M., Helm. Coll. 7859.) 



SCHISTOCEPHALUS SOLmUS (O. F. Muller) 



Figure 5 



A single strobile was found in a lot of cestodes collected by Mr. 

 Edwards November 13, 1903, at Woods Hole from the pied-billed 

 grebe {Podilyrribus podiceps)^ new host. The specimen was asso- 

 ciated with several strobiles of Ligula intesthialis, and was not recog- 

 nized until after it had been mounted in balsam. It is 60 mm. in 

 length, fusiform, tapering more posteriorly than anteriorly, the 

 greatest breadth being at a point a little in front of the middle. 

 Breadth of scolex and anterior segments, measured on their posterior 

 margins, 1 mm., 1.12, 1.40, 1.96, 2.10, 2.21, 2.49; length from 0.42 

 to 0.56; number of proglottides in the strobile, 94. Lateral margins 

 of strobile serrate. At the broadest part of the strobile the prog- 

 lottides measured 0.60 mm. in length and 3.64 in breadth. Near the 

 posterior end the proglottides were somewhat crumpled and measure- 

 ments were not satisfactory, but the length and breadth are about 

 equal, and about 1 mm. 



Rudiments of a cirrus first appear in the eleventh proglottis; a 

 few clusters of cells with somewhat irregular outlines appear in the 

 ninth proglottis and continue for about five proglottides which may 

 represent the testes. In the twelfth, thirteenth, and fourteenth 

 proglottides the cirrus, cirrus-pouch, testes, ovary, vitellaria, and 

 rudiments of the uterus could be seen. In the fifteenth proglottis 

 the uterus was filled with a compact mass of ova, not differing ma- 

 terially in size nor in apparent number of ova from similar masses 

 in the 79 proglottides which succeeded it. This mass of ova in the 

 fifteenth proglottis measured 0.35 mm. in length and 0.56 in breadth. 

 It should be remarked that although the full complement of ova 

 had appeared in the fifteenth proglottis, none had yet been formed 

 in the fourteenth. Ova seen in position to give the maximum section 

 are 0.075 by 0.045; an average of 12 ova taken at random was 0.071 

 by 0.043. The diameter of the cirrus-pouch was about 0.12. 



(U.S.N.M., Helm, Coll. 7860.) 



