390 LECTURE XVIII. 



and produces there a siiinlar nuclear body : tlie whole thus appears 

 like two of the spermatozoa of the lulus terrestris, with their broad 

 bases turned towards and touching each other. 



In the Chilopoda the generative organs terminate at the anal seg- 

 ment of the body, not, as in the Chilognatha, near the fore part of 

 the body. 



In the Centipede { Scolopendrd) the male organs are more complex, 

 and resemble those of insects. The testes of the Scolopendra morsi- 

 tans are seven in number, and closely packed in parallel lines ; each 

 testis is composed of two parts, fusiform, and precisely similar to 

 each other in mutual contact, but easily separable. From each ex- 

 tremity of the fusiform testis arises a narrow duct, so that there are 

 fourteen pairs of ducts arising from the fourteen secreting organs. 

 Each of the testicular bodies is hollow internally. The ducts ul- 

 timately end in a common tube, w^hich soon becomes enlarged and 

 tortuous, terminating by a simple aperture near the anus. Just prior 

 to its termination, the enlarged canal receives five accessory glands, 

 four of which are intimately united, until unravelled, while the fifth 

 is a simple caecum of considerable length. The sexual outlet is 

 situate near the anus. 



There is great diversity in the structure of the male organs in the 

 different genera of Myriapoda. In the Scutigera^ according to Leon 

 Dufour *, the testes are two fusiform organs, with a duct continued 

 from each extremity ; those from the upper end anastomose together, 

 and a long and slender canal is continued from the middle of the arch, 

 which, after a certain course, becomes disposed in a scries of progres- 

 sively increasing transverse folds, and finally divides into two terminal 

 slender pyriform sacs : these are the accessory vesicles. The sperm- 

 ducts continued from the lower ends of the fusiform testes bend up- 

 ward upon themselves, and dilate into reservoirs called " sperma- 

 thecae," similar in size and shape to the testes themselves, and each 

 of these terminates separately upon the anal segment. The fusiform 

 testes have many small pouches, or diverticula, produced from their 

 outer side. 



In the genus Lithobius], the testes are fusiform, but free at their 

 upper pointed ends, and they are everywhere beset with numerous 

 subspherical or graniform secerning follicles. Three long blind 

 tubes — accessory glands — communicate with the proper sperm- 

 ducts ; the common opening being, as in other Chilopoda, at the ter- 

 minal segment. Treviranus speaks of a small fleshy corneous penis 

 in the Lithobius. 



» CCLIII. p. 97. pi. V. fig, 5. t CCLIII. p 87. pi. v. figs. 2, 3. 



