] 86 Miscellaneous. 



of connective tissue coiitainin<? oval nur-lci. From the reservoir the 

 vas deferens is separated off, the epithelial cells and nuclei of which 

 are larger than those of the reservoir. The vas deferens runs for a 

 time within the testis, forms loops there, and, after issuing there- 

 from, makes several loops, rolling itself into a little ball, and tlien 

 passes into the seminal vesicle. 



The epithelial cells of the seminal vesicle (vcsicula seminalis) are 

 very columnar and ranged in annular cylinders (" lUngwalzen "). 

 These cells are of a glandular nature. On the outer side of the 

 epithelium lies an extraordinarily thin connective-tissue membrane, 

 and then follows a muscular layer, which we do not find upon the 

 vas deferens. The deep-lying layer consists of circular and the upper 

 layer of longitudinal muscles. In addition to the closely adhering 

 thin connective-tissue membrane, which envelops the entire vas 

 deferens and the seminal vesicles, these two organs have a special 

 membrane, which is not closely adhering and is a prolongation of 

 the testicular membrane. This membrane completely conceals the 

 vasa deferentia. 



The seminal vesicle narrows into a bow-shaped canal, which o|)ens 

 not into the ductus ejaculatorius, but into the glanduliX! mucosae. 

 The epithelial cells, which clothe this canal, are very highly vacuo- 

 late, so that they have a spongy appearance. Elind tubes which are 

 described by K. Leuckart * as appendages of the glandular mucosae, 

 and figured in his chart (' Anatomic der Biene'), are nothing else 

 than severed muscles which are attached to the wall of the abdo- 

 men, and were described by Swammerdara. 



The glandulce mucosae have, beneath a thin membrane of connec- 

 tive tissue, a layer of longitudinal muscles ; under this is a layer of 

 circular muscles, and then, in addition, we have three groups of 

 deeply-lying longitudinal muscles, which are only developed in that 

 portion of the organ which is nearer the ductus ejaculatorius. These 

 longitudinal muscles press the e])ithclial layer of the mucous glands 

 into three longitudinal folds. Towards the other end of the mucous 

 gland the deep-lying muscles grow continually narrower, until they 

 finally disappear altogether. Beneath the muscular layer lies a 

 structureless membrane of connective tissue, and then a layer of 

 narrow, columnar, glandular epithelial cells, with oval nuclei. 



The ductus ejaculatorius is inserted by means of two chitinous 

 branches into the junction of the two glandula? mucosa\ This 

 paired portion of the ductus ejaculatorius is completely hidden 

 beneath the muscular layer of the glandulte mucosa*. The ductus 

 ejaculatorius, as well as the entire copulatory apparatus, is devoid 

 of muscles. (In Girardf and Cheshire i wc find it incorrectly 

 stated that the ductus ejaculatorius has a strong musculature.) 

 Beneath the very thin membrane of the ductus ejaculatorius lie 



* R. Leuckart, ' Die Anatomie der Bieno : ' Cassel und Berlin, 18So, 

 p. 13. 



t M. Girard, ' Les Abeilles : ' Paris, ISSo. 



j Cheshire, ' Bees and Bee-Keepiug : ' London, 1887. 



