42 S. GOTO. 



however, there is no gland connected with these chitinous pieces.'^ 

 These pieces might be supposed to help the parasite in attaching itself 

 to the host, were it not for the fact that they are on the dorsal side of 

 the body, and are therefore presumably of no use in that respect ; but 

 I am not able to suggest any other use of them. 



If, now, we compare the structure of the glands hitherto de- 

 scribed, we find a close similarity of their products with one another as 

 well as with those of the sticky glands of Gtjrodactylidce. The clear, 

 transparent fluid that fills the vacuoles of the lateral glands of T, 

 sinuatum and T. biparasiticum might be mentioned as exceptions ; but 

 we find in their eiferent ducts just the same granular substance as in 

 the anterior glands, showing probably that the clear contents of the 

 cells assume the character of granules in their passage along the duct. 

 That the anterior glands of Gyrodactylidm are sticky, and are u,sed for 

 attachment can be demonstrated under the microscope ; so that I 

 believe it is not much amiss to regard, as I do, the glands above 

 described as having the same function. It may also be mentioned, in 

 addition, that Langley^^ and Reid^^ have described granules in 

 the mucous glands' of some vertebrates, which seem to me in many 

 respects similar to those of the glands above described. 



It is not perhaps out of place, here to observe that the position of 

 the opening of the. posterior sticky glands of Monocotyle does not seem 



1). Here, again, it should be observed that these so-called chitinous pieces of T. rotundiim 

 are deeply stained in borax-oarmin. 



2). Langley— On the Histology of the Mucous Salivary Glands,, and on the Behaviour of 

 their Mucous Constituents. Journ. of Physiology. Vol. X, 1889. p. 433-457. 



3). Eeid— Mucin Granules of Myxine. Same Journ. Vol. XIV, 1893. p. 340-346. 



These authors state that the granules are not stained in haematoxylin, and that cold 

 sublimate causes them to burst. This latter fact seems not to accord with the observations 

 described in the text, in vrhich the granules are always preserved intact. Eeid also states that 

 boiling water makes the granules break into a mass of stringy debris. Hence we should 

 probably infer that the granules of the glands described in the text and those of the mucous 

 glands of the vertebrates are not exactly of the same chemical constitution. 



