834 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [116] 



It was found almost impossible to make satisfactory measurements 

 of living worms on account of their great activity and consequent ex- 

 treme variability. In the following measurements of living specimens 

 the dimensions of the head, neck, and length of strobile are approximate : 



Dimensions. 



No. 2. 



Length 



Length of hothria 



Breadth of head 



Length of neck 



Breadth of neck 



Length of contractile hulbs. 

 Breadth of contractile bulbs 



Length of first segment 



Breadth of first segment 



Length of last segment 



Breadth of last segment 



Number of segments 



The following additional measurements of No. 2 are given to show 

 the proportions of the segments : Length of first segment, .06 

 ond, .10 mm ; third, .26 mm ; fourth, .70 lum ; fifth, 2.10 1 » m ; sixth, 3.60 



The following measurements are of alcoholic specimens : 



im J SeC- 



Dimensions. 



Length . 



Breadth of head 



Length of head and neck . . . 

 Breadth of neck 



Length of contractile bulbs 



Length of first segment 



Breadth of first segment . . . 

 Length of third segment. . . 

 Breadth of third segment . . 

 Length of fourth segment. . 



Length of last segment 



Breadth of last segment ... 

 Number of segments 



No. 1. 



No. 2. 



No. 3. 



mm. 



mm. 



mm. 



4.00 



4.20 



4.40 



0.30 



0.24 



0.28 



1.20 



1.10 



1.30 



0.20 



0.20 



0.20 



0.56 



0.56 



0.64 



0.06 



0.04 



0.06 



0.17 



0.15 



0.12 



0.16 



0.12 



0.14 



0.14 



0.14 



0.11 



0.36 



0.30 



0.34 



1.40 



2.10 



1.60 



0.20 



0.16 



0.14 



6 



6 



6 



No. 4. 



mm. 

 4.00 

 0.26 

 1.20 

 24 

 0.50 

 0.05 

 0.16 

 0.14 

 0.14 

 0.32 

 1.40 

 0.22 

 6 



The first segment is here reckoned from the base of the contractile 

 bulbs to the first transverse line. The second segment has about the 

 same dimensions as the first. In specimens that are in glycerine the 

 segments are somewhat opaque, while the neck and head are quite 

 transparent. 



Only one of the alcoholic specimens had more than six segments. It 

 had about eight distinct segments, which were more rounded, bead-like, 

 and shorter in proportion to the length than in the others. The last 

 segment is not so long in proportion to the others. The proboscides 

 were retracted and the hooks could not be seen plainly, but the speci- 

 men is apparently the same species as the others. 



