756 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [38] 



Following are measurements of specimens mounted in Canada bal- 

 sam. The specimens were collected in August, 1881. 



Dimensions. 



Length 



Breadth of head 



Length of hothrium 



Diameter of bothrium, average . 

 Diameter of pedicel at base 



Length of neck 



Diameter of neck near head 



Diameter of neck, base 



Length of first segment 



Breadth of first segment, front . 

 Breadth of first segment, rear .. 



Length of last segment 



Breadth of last segment 



Number of segments 



No.l. 



No. 2. 



mm. 

 21.50 



mm. 

 16.00 



.83 



.TC 



.50 



.40 



.30 



.24 



.12 



.10 



1.80 



1.10 



.09 



.12 



.14 



.12 



.16 



.32 



.12 



.10 



.16 



.12 



1.36 



1.08 



.56 



.56 



62 



65 



No. 3. 



mm. 

 6.00 



.60 



.34 



.30 



.10 



1.00 



.06 



.20 



.04 



.16 



.16 



.68 



.18 



60 



In No. 1 the anterior segments are squarish, quadrate in cross-section, 

 their posterior corners extended into laciuire, which, like those at base 

 of neck, are short, stout, and truncate at distal end. In No. 2 the laciniae 

 at base of neck are like those in No. 1, but on the first segments they 

 are rather slender and not truncate. In No. 3 the first segments are 

 very short and much crowded and the posterior segments have their 

 laciniate borders reflexed like a collar. The last two segments are also 

 somewhat distorted and show a tendency to bend rather sharply towards 

 one margin. This specimen is evidently younger than the others and 

 the variations which it exhibits may be due to differences in age and 

 conditions of contraction. 



The lacinia? on the posterior segments of Nos. 1 and 2 are short and 

 broad. The bothria in all are terminally vertieillate with conical pedi- 

 cels that enlarge rapidly towards the face, which is limited by a thick 

 muscular margin. 



The following measurements were obtained from living specimens 

 which were collected July 25, 3887 : 



Dimensions. 



Length 



Breadth of head 



Diameter of neck, average 

 Length of neck 



Length of first segment . . . 

 Breadth of first segment . . 

 Length of last segment ... 

 Breadth of last segment . . 

 Number of segments 



No.l. 



No. 2. 



mm. 

 19.00 



mm. 

 20.00 



.80 





.16 



.06 



.32 



1.G0 



.18 



.44 



.18 



.16 



1.80 



1.00 



1.06 



.16 



120 





