

770 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [5! 



The iieck is crossed with fine transverse lines which, in less than 

 millimeter back of the head, outline the first segments. These for 

 short distance are very short but increase in length rapidly. In j 

 alcoholic specimen, at the distance of 1.4""" from the head, the segmen 

 are as long as broad ; at a distance of 3"" n they are a little over twit 

 as long as broad; about the middle of the strobile their length is fi> 

 times their breadth ; the last segment is seven times as long as its grea 

 est breadth; the entire specimen measured 14 mm and the last segmei 

 1.4 mm iu length. 



The breadth of the body remains nearly uniform throughout. Tl 

 posterior segments are usually rather narrow at the two extremities an 

 swollen iu the middle in the vicinity of the reproductive aperture. Tl 

 dimensions of one mature segment, somewhat flattened, are : diameti 

 near anterior end .16""" ; diameter in front, at junction with precedii 

 segment, .l ram ; diameter at middle .22 nim ; diameter near posterior en 

 .12 U1U1 ; diameter at junction with succeeding segment .O8'" m . 



When mature segments are placed in glycerine and studied with 

 low magnifying power, the ovaries may be seen as two long, somewhi 

 opaque bodies, lying at the posterior end of the segment, one on eac 

 side of a transparent median space and extending nearly to the midd 

 of the segment. 



The reproductive aperture is marginal, about the middle of the sej 

 meiit. The cirrus was retracted in all the specimens, but it could I 

 seen, together with the vas deferens, lying in a coil in the middle of th 

 segment. Several large ova were observed lying loosely along tL 

 median line, from the anterior end of the segment back to the front en 

 of the ovaries. These ova vary greatly in size and shape. They appea 

 to be quite large in proportion to the size of the segment, and- ar< 

 moreover, comparatively few. Measurements of average ova yielde 

 the following results : .017 by .Oil 11 "" ; .019 by .Ol mm ; .022 by .Oll lu 

 ,,017 by ,013 mm . An elongated ovum measured .05 by .Oll mm ; auothe 

 ,047 by .014 ram ; a pear-shaped one was .03 mm long, .014 mm in its greater 

 breadth, and .008 ium in its least breadth. 



The following measurements were obtained from living specimens : 



