GENERATIVE ORGAN'S OF ARTHROPOD A. 



303 



Fig. 159. Female generative organs of Hydrobius 

 fuscipes. o Ovarian tubes, ov Oviduct, beset with 

 glandular appendages, gl Tubular glands, v Vagina. 

 be, Bursa copulatrix. rs Receptaculum seminis (after 



Stein). 



tionately wider and coiled cascal tube, which is sometimes provided 

 with an appended gland. 



The bursa copulatrix is another organ, which is directly con- 

 nected with the vagina; it is a wide cascal-sac (Fig. 159, be), which 

 looks like a diverticu- 

 lum of the wall of the ( \\\ ) 

 vagina. This organ is 

 found in some orders 

 only, and even in them 

 it is not generally pre- 

 sent. The bursa copu- 

 latrix of the Coleop- 

 tera appears to be the 

 most independent, and 

 not unfrequently is of 

 a considerable size ; in 

 them it is generally 

 connected to the va- 

 gina by a canal. In 

 the Lepidoptera also 

 it opens into the va- 

 gina by a narrow duct ; 

 but it is remarkable 

 from the fact that it 

 has another efferent 



duct in addition to this one, which it sends off below the female 

 generative pore, where it opens separately. In the Lepidoptera 

 fertilisation is effected by means of this canal, the spermatozoa pass- 

 ing into the receptaculum seminis from the bursa copulatrix by the 

 above-mentioned duct, which connects it with the vagina. The open- 

 ings of the two parts into the vagina are opposite to one another. 



The accessory glandular organs 

 of the vagina either consist of a 

 pair of simple canals which gene- 

 rally form long loops (Fig. 160, gl) 

 (Lepidoptera, many Diptera), or 

 of short caecal tubes (Bugs). In 

 others they are greatly ramified 

 (Ichneumonidge and Tenthredinidas). 

 The secretion of these cement- 

 glands serve to attach the eggs 

 when laid, and at times to unite 

 them into masses. 



As a rule some portions of the integument, which have the form 

 of valves, are connected with the female genital pore ; the markings 

 on these valves are always exactly adapted to the male copulatory 

 organ ; sometimes they are arranged like nippers, and consist of 

 pi-ocesses which work laterally on one another. 



Fig. 160. Female generative organs 

 of Mallophagus. o Ovarian tube, u 

 Uterus, gl Glands (after R. Leuckart). 



