826 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [108] 

 Following is a list of the captures of this worm : 



Date of 

 capture. 



No. of Dog- 

 fish 

 examined. 



Number of specimens obtained and remarks. 



1886. 







July 22 . . . 



1 



Three, and free proglottides. 



23... 



3 



Twenty, and free proglottides with dark colored ova. 



24... 



4 



Several. 



31... 



1 



Twelve. 



1887. 







July 1&.. 



6 



Several in each. 



21... 



10 



Abundant in each. 



23... 



1 



Eight. 



Aug. 4... 



3 



One. 



6... 



1 



Two. 



10... 



3 



Twelve, eleven from one host. 



11..". 



2 



Pew. 



12... 



1 



Two proglottides in bad condition. 



13... 



2 



Five, two from one host, three from the other. 



These specimens were associated in most cases with B. tumidulum, 

 Calliobothrium verticillatum, and C. eschrichtii. 



In the alcoholic specimen, of which I gave detailed measurements in a 

 former paper, the entire length was 3l mm , and the length of the last seg- 

 ment 3 mm . I have since measured living specimens which differed little 

 from the alcoholic specimens, except in the dimensions of the last seg- 

 ment. In one specimen, which measured 23 mm in length, the last seg- 

 ment was 3.5 mm in length, and a free proglottis 6 mm long and 2 mm broad. 

 In another lot two strobiles yielded the following measurements : 

 Length of one, 27 mm ; length of last segment, 7 mm . Length of the other, 

 38 mm ; length of last segment, 8.5 nnn . Free proglottides were associated 

 with these, which were as much as 10 mm and 12 mm in length. These are 

 extremely active and evidently continue to grow after they have sepa- 

 rated from the strobile. 



The following detailed measurements were made of an alcoholic speci- 

 men: Length, 20™ m ; length of head, .44™™ ; diameter of head, .50™™; 

 diameter of neck, near head, .24™™, middle .20 mm , base .30™™ ; length 

 of head and neck, 1.60™™ ; distance to first distinct segments, 7™™ ; 

 length of first segment .60™™, breadth .60™™; length of last segment 

 3.7™™, breadth .90™™; length of proboscis 1.80™™, diameter .04™™. 



The diameter given for the head is from the base in marginal view of 

 strobile; the corresponding diameter in lateral view of strobile was .40™™; 

 the diameter of head near the apex is .34™™ in both views. In my 

 former account of this parasite there is a typographical error on page 

 488, where the diameter of the proboscis should read .033™™ instead of 

 .33™™. 



Arrangement of hooks on proboscides. — The figures published in this 

 and the former paper give different views of the proboscides in this 



