18 ART. 7. — I. IJIMA. 



actly a fat but more probably an albuminoid. Similar, if not 

 identical, bodies are known from certain other larval Cestodes* 

 Aubert'^ found in Gryporchynchus jjusillus, a Plerocercus from 

 Tinea vulgaris, a large number of refractive spherules massed 

 together in the hind body ; they were held by the describer to 

 be fat, but this seems to require confirmation. The peculiar 

 " Schollen," described by Bartels^^ from the hind parts of Oys- 

 ticerciis fasciolaris, seem to closely agree with the bodies I have 

 met with in Plerocercoides proUfer. In this relation might fur- 

 ther be mentioned the clear drop-like spheres which are known 

 to appear in Cysticercus pisiformis, etc. at the place occupied 

 later by the internal cavity of the caudal appendage. This may 

 be held to be an indication that there possibly may obtain a 

 genetic relation between that cavity and the vesicular spaces con- 

 taining reserve nutritive-matter in Plerocercoides prolifer. 



An extensive system of excretory vessels traverses the entire 

 body of the worm {ex., figs. 16, 17, etc.). As in the Bothrioce- 

 phalidse generally, there exist several main vessels running in an 

 approximately longitudinal direction. These frequently branch 

 and anastomose with one another, thus bringing about an irregu- 

 lar network of the vessels. Those of largest caliber are seen in 

 the posterior parts of the body, where they may be of a con- 

 siderable width. As in Bothriocephalus mansoni, transverse sections 

 through that region show them in section numerously in all parts 

 of the parenchyma except in the peripheral zone (fig. 17). The 

 external opening at the hind end could never be distinctly 

 brought into view. Towards the anterior parts the network of 



1) H. AuBERT. Zeitschr. f. wiss. Zool. Bd. 8. P. 284, 



2) E. Bartels. Zool. Jahrb. Abth. f. Anat. u. Ont. Bd. 16. P. 516. 



