478 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [26] 



the posterolateral edges of the segments are eacli distinctly four-lobed. 

 The two original flaps, those near the margins, continue, however, to be 

 a little longer and sharper-pointed than the two median ones. At the 

 150th segment the two middle flaps or lobes become indistinct, and are 

 represented only by gentle flexures of the posterior margin ; the notch 

 between them is at this point broad and shallow. From the 160th or 

 161th to the 192d segment the median notch deepens gradually, and 

 the secondary or median lobes disappear, leaving the postero-lateral 

 margin two-lobed, the inner margin of each lobe with a slightly waving 

 convex outline. The segments thus far are short and somewhat 

 crowded, the length, in the specimen measured, after mounting in 

 Canada balsam, uniformly about 0.14 bm to 0.10 mm . At the point where 

 the segments become two-lobed the margins become rounded, convex, 

 the segments lengthen to about 0.20 mm . At the 200th segment the pro- 

 glottides are nearly circular in outline, globose in living specimens. At 

 this point the segments begin to lengthen abruptly. The average length 

 of the last four segments, with circular outline, being 0.64 mm , while the 

 average length of the next four segments is 1.02 mm . The last segment 

 the 212th in the specimen from which the above measurements were 

 taken, measured 1.90'" 1 " in length and 0.81""" in breadth. 



The following measurements are intended to show the proportions at 

 different points on the strobile. They were made from mounted speci- 

 mens, and consequently may be a little less than they would be if taken 

 from living specimens: 



Milimetera. 



Length of speci men 00. 00 



Breadth of head, in front 0.23 



Length of bothria • 0.30 



Breadth of bothria, front and middle 0. 10 



Breadth of bothria, posterior end - 0. 04 



Spread of hoolcs, tip to tip 0. 16 



Length of hooks 0. 14 



Breadth of segments just back of head "- 0.076 



Breadth of segments 1""" back of head 0.09 



Length of segments without flaps '- - 0. 127 



Length of segments including flaps 0. 159 



Breadth of segments 2 mm back of head 0. 16 



Thickness °- ° 2 



Length °- 14 



Length, including flaps 0.16 



Breadth of segments 11""" back of head 0. 30 



Thickness ' °- 08 



Thickness, including flaps 0-16 



Breadth of segments 18 mm back of head, four lobes 0. 46 



Length • °- 16 



Thickness °- 10 



Breadth of segments 22""" back of head 0. 52 



Breadth of segments 33 mm back of head, two lobes .'. 0.66 



Length, including flaps °. 16 



Breadth of segments 45" 1 '" back of head, round segments 0. 78 



