138 VERANY AND VOGT ON THE HECTOCOTYLI 



deferent canal makes a multitude of folds, united to those of 

 the accessory gland by very fine and very elastic fibres, which 

 while they unite them, allow of a very considerable amount of 

 contraction to each of these canals. At the extremity of the 

 comu the deferent canal opens into a kind of common reservoir 

 which lies at the entrance of the comu. 



The accessory gland (PI. III. fig. 5 m) which is enclosed in the 

 cavity of the cornu, with the deferent canal, is composed of two 

 portions, which, however, in their intimate structure present no 

 essential difference — the gland itself and the excretory canal. The 

 gland is a flattened body rolled almost spirally, and exhibits 

 even to the naked eye a granulated appearance, resulting from 

 the presence of many minute points which are almost entirely 

 opake by transmitted light. The intimate structure of this gland 

 is very remarkable ; its parietes are very thick, and there is in 

 the middle of the gland a cavity which is directly continuous 

 with the excretory canal. Instead of glandular tubes, it consists 

 of little, more or less rounded sacs (PL III. fig. 8.), which are hol- 

 lowed in the very substance of the gland, and whose aperture is 

 almost as large as its base. These sacs beset the whole internal 

 surface of the gland and of its excretory duct ; they are merely 

 deeper in the gland than in the duct, and disposed a little more 

 obliquely with regard to the axis of the gland. They are imme- 

 diately surrounded by a very much developed elegant capillary 

 network. The proper walls of these sacs are very thick ; they 

 are composed of a small number of circular fibres, and are lined 

 internally with a considerable layer of cylindrical cells, carry- 

 ing at their extremity very long cilia ; these are in continual 

 movement, and they transport a viscous homogeneous liquid 

 containing fine granules, which are here and there united into 

 little masses. These glandular sacs, which doubtless secrete the 

 mass of which the envelope of the spermatic machines is formed, 

 are continued until close to the anterior extremity of the excre- 

 tory canal ; there they disappear by degrees, and the excretory 

 canal itself becomes considerably enlarged, to form a wide sac 

 (PL III. fig. 5 b) into which the deferent canal also opens. This 

 sac is on all sides attached to the parietes of the comu, so that 

 the cavity of the latter is completely shut at this place, and thus 

 there is no other passage from the cornu to the flask than 



