38 S. GOTO. 



on the inner surface of which some granulations' are to be observed 

 (PL XIX, figs. 1 and 4). 



As to the cellular structure of this gland, which I believe is heris 

 described for the first time in Calicotijle, there are, I think, two 

 altei-native views to be considered. One would be to regard it as 

 being multicellular in its origin and to have been formed by the in- 

 vagination of the epidermis ; the other would be to regard it as 

 unicellular. Against the second view it may be urged that these 

 glands are too large to be regarded as unicellular — incomparably larger 

 than the unicellular glands of similar function and position of the 

 Gyrodachjlidae — and that the presence of the internal cavity strongly 

 points to the other view ; while the similarity of its wall to that of the 

 similar glands of Diplozoon, Axine, and Diclidopli(xra is also in favour of 

 the first view. 



Monocotyle — In this genus there are fom- pairs of sticky glands 

 at the anterior end of the body, and one in the posterior part. The 

 anterior glands are of exactly the same structure as those of Microcotyle, 

 and are arranged at equal distances along the front part of the 

 lateral border of the body, on both sides of the anterior notch (PL 

 XVII, fig. 1). 



The posterior sticky glands are situated in that part of the body 

 which lies dorsally to the posterior sucker, and consist of numerous 

 small cells, each with a distinct, deeply stained nucleus and a very 

 finely granular or almost homogeneous cytoplasm which seems to be 

 destitute of an external membrane. The cells are of various sizes, 

 apparently owing to the dififerent stages of secretory activity ; and the 

 smaller ones are more deeply stained and have more finely granular 

 cytoplasm than the larger ones (PL XVII, figs. 5 and 12). In some 

 parts, these cells are so closely pressed against one another that their 

 boundaries become indistinct, and the whole appears somewhat like a 



