810 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [92] 



21. Calliobothrium verticellatum Kudolphi. 



See Report of U. S. Fish Commission, 1886, pp. 476-479, Plate IV, Figs. 1-8, for de- 

 scription and synonymy. 



I have already published a description of this Cestod, which I ob- 

 tained in August, 1884, from the spiral valve of Mustelus canis. 



Since then I have made several captures of this parasite in the same 

 host. 



Date of 

 capture. 



No. of dog- 

 fish exam- 

 ined. 



Number of parasites found and remarks. 



1886. 









July 22 





1 



A single specimen. 



23 





3 



Several in one, one in another, none in third. 



24 





4 



Several in each. 



31 





1 



Twenty specimens more or less, maximum length 154 mm . 



1887. 









July 19 





6 



Several from two of the hosts, maximum length 9« mm . 



21 





10 



Moderately abuudant in all. 



Aug. 4 





3 



Several obtained from each. 



6 





1 



Three specimens, maximum length 115 mm . 



10 





3 



About a dozen from one, ten from another, none from third, 110 mm maximum. 



12 





1 



A few specimens much attenuated and flaccid. 



13 





2 



About forty specimens in one, nine in the other. 



I add the following data to my former account of this worm. The 

 length of the adult strobile evidently far exceeds 100 mm , the maximum 

 of my former paper. The longest living specimen that 1 have measured 

 was 154 mra in length. I also find several alcoholic specimens measuring 

 as much as 90 mm in length. The free proglottides are much larger than 

 the posterior segments of the specimens upon which I based my former 

 description. 



Following are measurements of posterior and free segments of alco- 

 holic specimens : 



Milli- 

 meters. 



Length of proglottis . 

 Breadth of proglottis 



Milli- 

 meters 



Milli- 

 meters. 



Milli- 

 meters. 



5.6 

 1.3 



4.6 

 1.4 



3.6 

 2.2 



5.4 

 1.3 



In a living strobile, 115 mm in length, the last segment, when at rest, 

 measured 3.5 mm in length and 1.75 mm in breadth. Free proglottides iu 

 the same lot were very active, in some cases stretching themselves out 

 to a length of 10 mm . 



The following points were made out without the aid of thin sections: 

 The genital apertures are marginal, near, or in front of, the anterior 

 third. There is sometimes a low papilla in the vicinity of the aperture. 

 The cirrus is comparatively short, small and covered, at least at base, 

 with exceedingly minute spines. It was not seen fully everted. Diameter 



