522 JOSEPH STAPPORt), 



of the prostate ducts but they have such a regular structure, are so 

 constantly present and have such a definite boundary that it is im- 

 possible to believe this to be their nature. That they are the distended 

 ends of the ducts themselves which is very probable is also difficult 

 to understand for I have seen no mouth- openings. But whatever 

 their exact nature is, I am satisfied that the prostate ducts discharge 

 their contents into the caecal canals of the bulbus where it is pressed 

 forwards to mix with the spermatozoa at the anterior end of the 

 papilla. Fig. 10 shows an enlarged prostate gland with its duct taken 

 from the right side near the anterior end of the bulbus of Fig. 9. 

 A single prostate gland measures 9 by 20 /n^ nucleus 4 i-i. 



As regards the papilla itself only the anterior end (Fig. 9) will 

 be seen distinctly separated from the other parts. Through its axis 

 passes the inner ductus bounded by epithelium, a muscular ring and 

 a number of parenchyma nuclei the whole surrounded by the back- 

 wardly reflected walls of the ductus, here forming the second of the 

 three concentric cylinders of the ductus tube viz inner ductus 

 (papillär duct), outer boundary of papill a, and outer ductus. 

 Farther back the boundary of the papilla falls on the inner angles of 

 the caecal canals. On the inside of the inner ductus is an epi- 

 thelium-like membrane with nuclei but no distinct cellular structure. 

 Where this bends round the end of the papilla are a heap of paren- 

 chyma-nuclei. Also on the inside of the outer ductus where not 

 occupied with prostate ducts are nuclei under the muscle layers e. g. 

 on the outer boundaries of the caecal canals where they are continuous 

 with the bladder-like endings of the prostate ducts. This would seem to 

 show that these bladders are only epithelial cells that have lost their 

 nuclei. But on the other hand the nuclei have no distinct cell 

 boundaries, the bladders show no ducts opening between them, and as 

 before mentioned their contents and continuation through the walls of 

 the caecal canals are antagonistic to that view. In places the layer 

 of lining epithelium has a marked resemblance to the cuticle, but in 

 other places it is so broken and jagged as to appear like loose secretion 

 masses on the inside of the canals. 



The outer ductus ejaculatorius, after narrowing as it runs 

 forwards round the point of the conus bulbi, continues a short distance 

 in the form of a simple tube and then swells into much larger dimen- 

 sions as its lumen passes through a ring of foldings and thickenings 

 of the wall, beyond which the tube is continued until its walls are 

 reflected round the anterior margin of the penis sack onto the inner 



