518 P- E. Keuchenius, 



More clearly do we find this on fig. 36, where we see these muscle- 

 fibres of the outer wall of the ductus ejaculatorius, continuing 

 immediately in the muscle-fibres, which connect the apothetes eja- 

 culatorius (fig. 36 ap) (which is to be found also in Lucilia caesar), 

 with the wall of the sacculus ejaculatorius (fig. 36 sac). In this 

 fig. 36 we also perceive, that the epithelium [ey) of the ductus eja- 

 culatorius protrudes a short way into the lumen of the sacculus, 

 so that it does not end at the place of the entrance of the ductus into 

 the sacculus. 



The sacculus ejaculatorius opens at the outside by means 

 of the ductus copulatorius (fig. 30 cof). Both are provided with 

 a soft chitinous intima (fig. 36 ch). 



Sarcofhaga carnaria Linn. (Fig. 37 — 46). 



The male genitalapparatus of Sarcophaga carnaria consists of 

 the following parts (fig. 37): one pair of testes with their vasa defe- 

 rentia, which open into the ductus ejaculatorius together with 

 the accessor^al glands. The ductus ejaculatorius finds an 

 outlet in the sacculus ejaculatorius, 



The testes are a pair of brownish-red, oblong and bent bodies, 

 which are pointed proximally more than distally. In proportion to 

 the size of the insect, the testes may be considered rather big, and 

 therefore they are very easily sectioned out of the abdomen. They 

 are placed ventro-laterally of the gut, the right testis more cranially 

 than the left one. The distal apex of the testes bends a little into 

 cranial direction and continues in the vasa deferentia (fig. 37), 

 The testes are. not enclosed by fat-body-tissue. On the surface 

 of the testes many tracheal trunks are to be observed (fig. 37). The 

 outer Investment of the testes is formed by the tunica externa, 

 a brownish-red pigmented layer, which varies in thickness and seems 

 to tear off very easily from the interna. In the externa dispersed 

 flat nuclei are to be seen. Several places are very little or even scarcely 

 pigmented and these places appear as light spots (fig. 37). We already 

 observed before, that the testes are surrounded by many ramifying 

 tracheal trunks. It is a matter of course that they are visible on the 

 sections (fig. 38 tr), while I also observed that the tracheal trunks 

 ramify themselves in the tunica externa. The tunica propria 

 forms the lining of the testes and it appears distally very distinctly 

 as an epithelium, which continues proximally in the membrana 

 propria. No where have I seen cellular or tissue-septa going out 



