ZOOL.-VOL. II.] EISEN-OLIGOCffyETA. 141 



situated close to the groove in the penis. At times the 

 pore was found near the base, this always being the case 

 when the muscular cushion was retracted. When the lat- 

 ter was more or less extended, the pore was found nearer 

 to the apex of the groove. The secretion of the Y-gland 

 when coagulated is tough and resembles, superficially at 

 least, the secretion from the silk glands of a caterpillar. In 

 many of the specimens the secretion of this gland has been 

 ejected, forming a very thin flattened string several inches 

 long, either hanging down along the side of the body or 

 twisted and rolled into a ball around the copulatory cushion. 

 Quite a little force is required to break this thread. The 

 thread stains but poorly with hgematoxylin and methylene 

 blue, and cannot therefore be of a strictly mucous nature. 

 It shows a fine longitudinal striation, as if consisting of 

 innumerable fine strands. The pore of the Y-gland is 

 round and possesses but a single opening. The pore is 

 also connected with a tiny groove which runs parallel (and 

 opposite) to the groove in the penis, but which is much 

 shorter. The upper end of the Y-gland is muscular, the 

 two forks are separate as regards their lumens, but they are 

 surrounded by a common muscular covering of great thick- 

 ness. According to Beddard's figures the prongs of the 

 gland are longer than the canal, the prongs joining close to 

 the wall of the bursa. In my specimens the Y-gland 

 possesses a longer duct, as shown in fig. 44, y gl. This 

 duct is very much curved and enters the bursa from the 

 ventral side of that organ, while Beddard's figures indicate 

 that the Y-gland enters the bursa from its dorsal side. 



Prostates. — In my specimens the longer prostate is about 

 twice as long as the shorter one and must, I think, be the 

 main prostate, while the shorter part may be called a 

 diverticle of the other. These two parts cannot well be 

 considered as two distinct prostates joined together, on 

 account of the difference in structure, which, though slight, 

 seems of sufficient importance to be considered. 



Thin sections of the two parts of the prostates are found 

 to stain differently, one taking the stain much more readily 



