STUDIES OX THE ECTOrARASITIO TREMATODES OF JAPAN. 129 



membranons wall is exceedingly thick, and its intei'nal surface is 

 uniformly covered with stout cilia. The terminal liiilfof the vaginal 

 canal is, in this genus, surrounded by numerous unicellular glands, the 

 vaginal glands. Since [ had only a single specimen of the worm and 

 was therefore compelled to pass and repass it through absolute alcohol, 

 clove oil, and turpentine in order to cut it into serial sections after a 

 detailed examination in toto, I am not able to state anything definite 

 as to the histological character of these glands ; but each gland is a 

 goblet-shaped cell with a short neck and with a vesicular nucleus 

 near its larger end, which usu:dly encloses a single, small nucleolus 

 (PI. XIX, figs. 1 & 12). These glandular cells are in most places 

 arrano^ed in a single laver around the vaoiual canal, but are in other 

 places also arranged in two layers. Wierzejski'^ states th:it in C. 

 Kroijeri the vaginal canal is muscular, but in the species I hav^e 

 observed its wall is simply membranous. In OnduKotijlc also the in- 

 ternal surface of the vaginal canal is covered with cilia, Avhicli are, how- 

 ever, finer and shorter than those of Calicot i/Ic (PI. XV, fig. 10). I have 

 besides observed in the farmer species that in the hinder portion 

 there is often on the inner surface of the vaginal canal a thin layer of 

 granular substance very similar to that observed in the vas deferens. I 

 have therefore been led to suspect whether the irregular polygonal or 

 goblet-shaped cells drawn in fig. 8, PI. X\"I, on the ventral side of the 

 vaginal canal and which were at first regarded by me as the jH'ostate 

 oflands be not in realitv the vaiiinal o-lands : but hitherto I have not 

 been able to find out any ducts. In all the other species I have not 

 observed any glandular cells around the vagina. 



In many specimens collected during the suiumer season the 

 vagina was found filled with sjiormatozoa. I have observed this in 

 ]\[icrocotijh', Axiiie, and Trist omum ; and since, as I have said in my 



1). "Wierzejski— /, c. p. 558. 



