STUDIES ON THE ECTOPAEASITIC TREMATODES OF JAPAX. 37 



Axine, (Diclidopkora, & Mic. reticulata — In these forms, there 

 is only one pau* of sticky glands. They are situated just in front of 

 the mouth (PI. I, fig. 5 ; PI. VII). Their form differs much from that 

 described in Microcotijle and Octocotyle and approaches more that of the 

 sticky gland described by me in Diplozoon NipponicumP They ai-e 

 constituted, namely, by an invagination and transformation of the 

 investing membrane of the body. They are shown in section in fig. 

 3, PL III. As may be seen from it, the cavity of the invagination is 

 lined by a granular mass, which is a direct continuation of the 

 investing membrane. The granules are very similar in appearance 

 and in their reaction towards staining fluids to those of the sticky 

 glands of Microcotijle. Here, moreover, there is no distinct basement 

 membrane but instead merely a dense layer of connective tissue 

 gradually passing into the surrounding mesenchyma. There are in 

 M. reticulata also some muscular fibres that come from the dorsal side 

 of the body and terminate in the dense layer of connective tissue just 

 mentioned (PL III, fig. 3). 



Calicotyle — In this genus, there ai-e two pairs of sticky glands at 

 the anterior end of the body, the eiFerent ducts of which are com- 

 pletely separate one from the other, but opsn very close to each other 

 near the anterior apex of the body. Each gland is a goblet-shaped, 

 hollow body situated on the external side of the pharynx, with a long 

 neck (the efferent duct) which proceeds towards the anterior end of 

 the body, where it opens. One of the pairs has a little shorter neck 

 than the other. The goblet-shaped portion has a thick wall consisting 

 of a granular substance, which, in the specimen I have examined, is 

 stained well in borax-carmin ; but as I have been able to obtain only 

 a single specimen of this genus, I can not state whether it is always 

 so or not. The wall of the efferent duct consists of a thick membrane, 



1). Goto— On Diplozoon Nipponicum, n. sp. This Journal, vol. IV, Pt. I, 1890. p. 166. 



