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



Following are measurements of specimens mounted in Canada bal- 

 sam. The specimens were collected in August, 188 J. 



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

 tbeir posterior corners extended into laciuite, 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 

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

 soinewhatdistortedaud show a tendency to bend rather sharply towards 

 one margin. This specimen is evidently j T ounger than the others and 

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

 conditions of contraction. 



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

 broad. The bothria in all are terminally verticillate 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 : 



