SEA-FISHERIES LABORATORY. 311 



tapering than in Yar. A. As in the former case their 

 posterior edges are rolled np and notched at the margins 

 and backs. Each bothrinm bears from seven to nine 

 separate locnli which was distributed much as in Var. A. 

 A central, and four transverse ridges divide np the face 

 so as to form four locnli on each margin of the bothrinm. 

 One loculus is nearly always apical, as shewn in the 

 figure. At the posterior edge two strong ridges, running 

 out radially, separate the face of the bothrium into three 

 cup-shaped loculi. 



Seen from the side, as in the case of the bothrium at 

 the top left-hand of fig. 19 B, each of the latter structures 

 presents a very characteristic appearance when seen in 

 profile. 

 Variety C. 



The cestodes identified as Var. C of Ech. variabile 

 differ so much from those already described that I hesitate 

 to place them in this species. But it is more probable 

 that they are only an extreme variety of the species than 

 that they are specifically distinct from the worms figured 

 as Vars. A and B. The appearance of the strobila is very 

 like that of the others, and the anatomy of the proglot- 

 tides, so far as studied, is not different. The scolex 

 (fig. 20) is at first sight most dissimilar. The myzo- 

 rhynchus is very large, and is either tabular or flatly 

 dome-shaped. Its outline as seen from above is some- 

 times (as in the figure) roughly quadrangular with 

 rounded angles, but more often it is circular. At times 

 radial lines may be seen which appear to be folds dividing 

 the upper surface of the structure into separate compart- 

 ments. The bothria are placed on very short pedicels, 

 or may be almost sessile. Each is small compared with 

 those in Vars. A and B. It may be derived from such 

 a bothrium as is shown in Var. B, by the complete rolling 



