4G6 REPOET OF COMMISSIONER OF FISH AND FISHERIES. [14J 



Measurements made oil the largest specimen were as follows : 



Total length of strobile meter.. 1 



Breadth of head, lateral millimeter. . 15 



Thickness of head, marginal do. .. G 



Breadth of neck do.. . it 



Breadth of posterior segment do... 5 



Length of posterior segment do.. . 2 



In this specimen all the mature proglottides had evidently become 

 separated from the strobile. On another specimen, measuring 580 mm 

 in length, the posterior proglottides were mature, and measured 5 mm in 

 length and 2£ min in breadth. 



Measurements of free living segments give the following proportions : 

 Length, 8 mm ; breadth, 4 to 4.5 mm ; length of penis, 4 mm +. 



A second and younger stage was represented by specimens ranging 

 in length from 190 mm to 230 mm . These differed from the next stage, 

 described below, in size and in having a more or less evident beginning 

 of a jointed condition. This, in the smaller forms of this second group, 

 was indicated by tolerably distinct waving transverse lines. The largest 

 specimen of this group, 230 mm in length, although tapering to a point 

 at the posterior end like the others, had distinct segments for the last 

 30 llim . 



Another group, consisting of quite young specimens, ranging in length 

 from 31 mm to 57 mm , represented a third stage in the development of this 

 worm (Figs. 7, S). These are evidently the young of this species. 



Measurements of one of them give the following dimensions: 



Millimeters. 



Length of srjecimeu 41. 00 



Length of head 1. 50 



Breadth of head 2.25 



Length of rostelluin 0. 50 



Breadth of neck just back of head 1.00 



Breadth of posterior extremity 0. 20 



The neck increases slightly for a short distance back of the head. 

 The body then tapers gradually aud uniformly to the posterior end. In 

 this group there is no sign of joints. Most of the specimens, particu- 

 larly after they have been preserved in alcohol, have a much more com- 

 pact arrangement of the folds of the bothria than appears in Fig. 7, 

 which was sketched from a living specimen, one of the smallest of the 

 lot. In larger specimens of this group the head is subglobose, with the 

 edges of the bothria in crisp, closely lying folds, so that it is very dif- 

 ficult to make out the number of lobes of the bothria or to determine 

 whether the latter are pediceled or sessile. The bothria are marginal, 

 sessile, or on very short pedicels, each divided into at least two second- 

 ary lobes, which ultimately become a mass of crisp folds. In the center 

 of the head, placed anteriorly, is a short chitinous rostellum on a pedi- 

 cel of soft connection tissue (Figs. 7, la, lb). Seen from the front this 

 rostellum is quadrate, and presents to view four crescent-shaped bodies 

 (Fig. la) with their convexities turned inward and inclosing a clear 



