4 PEOCEEDIXGS OF THE XATIOXAL MX'SETTM:. tol. «0. 



scoleces of the lot, and is a conspicuous feature which imparts a 

 characteristic accentuation to the outline of all the bothria. 



Dimensions of hothria: Length, maximimi 4 mm., minimum 2.5 

 mm.: breadth, maximum 2.-5 mm., minimum 1.5 mm. Breadth of 

 scolex in front, Tna-riTmiTn 2.5 mm., minimum 2 mm. 



Each bothrium is united with its fellow below the free median 

 borders: each is also continuous below with the corresponding 

 bothrram of the opposite pair. 



The scolex pcssesses a very short neck-hke portion which ends 

 abrnptly. in some cases projecting a httle, at the point of junction 

 with the strobile. A transverse section of a scolex is shown in figure 

 oA. Excretory vessels and a few ganghon cells appear in the 

 parenchyma, and the characteristic musculature of the bothria is 

 represented. 



A portion of a bothrium. more highly magnified, is shown in figure 

 oB. The ganghon cells in the mtiscle tissue of the bothria are large. 

 branching, and sti^est a multipolar structure . 



Loennberg^ notes the occurrence of such cells in D. sipiaria. He 

 describes them as being of peculiar structure, their cytoplasm coarsely 

 fibrous and without distinct borders. Each cell has a vescicular 

 nucleus, which contains a very small but sharply defined nucleolus. 



The ganghon cells in D. pli^itum agree with Loennberg's descrip- 

 tion, except that the cytoplasm, instead of appearing to be coarsely 

 fibrous, is rather retictilate: that is. it has somewhat the appearance 

 of an ameba with anastomosing pseudopodia. 



StroMlf. — The segments begin immediately behind the scolex. the 

 strobile here, and throughout, being relatively flat and thin. In the 

 specimen, from which the sketch for figure 1 was made, the strobile 

 near the scolex measured 1.12 mm. in breadth, and the proglottides 

 are 0.14 mm. in length. 



Figure 6 renresents a transverse section made at a point where the 

 strobile measures 1.20 mm. in breadth. The excretory vessels and 

 the lateral nerves are shown. The musculature is rather weak, lon- 

 gitudinal fibers being the only ones that could be made out. and the 

 musctilar layer is not sharpy marked off from the subcuticula. In- 

 deed, under high magnification sections of fine longitudinal muscle 

 fibers api>ear close to the cuticula. The smaller dorsal excretory 

 vessel lies in a rather close spiral and is often cut in two or three 

 places in the same section. The larger vessel also is spiral, but with 

 looser coils than the smaller vessel. 



The strobiles in this lot were all immature. The greatest breadth 

 noted was 1.33 mm., at which point the proglottides averaged 0.25 

 mm. in length. The strobile appears to have a shallow furrow run- 



' K. -ret. Atad. HBidl. Stockholm. toI 24 :':&'■>. p. 25. fig. 12. 



