1 60 I. IJIMA AND K. MURATA 



are to be looked upon in the same light (as Leuckart does) or not, 

 we are unable to say. 



We have studied the finer structure of the worm by sections cut 

 from five specimens, but we cannot add anything of importance to 

 what is already known from the investigations of Prof. Leuckart. 



The cuticula covers the entire surface of the worm. It is 

 homogeneous, thin but sharply defined, and does not stain with 

 carmine. 



Like other Vermes there is immediatelv beneath the cuticula a 

 system of fine circular and longitudinal fibers (ßg. 7, on the right 

 side). Circular fibers run externally to, but in close apposition with, 

 longitudinal fibers. In both layers, the fibers run isolated and parallel 

 with one another. Longitudinal fibers could distinctly be seen in 

 cross-sections. 



With respect to strongly develo]jed bundles of longitudinal 

 muscle-fibers as well as those isolated fibers that riui in all directions 

 through the mesenchyma, we have found just the condition as 

 described by Prof. Leuckart, except that we have failed to recognize 

 the especially thick grouping of muscle-bundles along the course of 

 lateral nerve-trunks. Anteriorly the muscle-bundles concentrate 

 themselves t(nvard the circumference of the involuted head {ßg. 6), 

 just in the same wsiy as we see it in the larva of Pothr. latus. 



As was pointed out by Leuckart, the number of excretory 

 vessels to be seen on cross-sections is very great. Those running in 

 the neiofhborhood of lateral nerve-trunks are of much larguer caliber 

 than those in the peripheral or the median part (see ßg. 8). In 

 sections of the head-part (ßg. 6), we have met Avith but a very few 

 number of small vessels. 



Larval Cestode (Sparganum) resembling the human Bothr. 

 liguloides was found by us in Inuus speciosus as well as in Mustelus 

 itatsi, but we reserve its description for a future opportunity. 



