rARACOKOTOCA AKEKMANI (waRREN). 331 



development occurs in situ while the egg- lies in its ovarian 

 tube. Afterwards it is to bo supposed that the larva passes 

 down the oviduct into the muscular vagina and is then 

 squeezed out to the exterior. When the ripe ovum or young 

 larva lias been passed out of the ovarian tube the old egg- 

 follicle and nutritive tissue would seem to undergo a curious 

 transformation into a kind of corpus luteum. The cells 

 shrink and the nuclei become very irregular and stain deeply 

 (fig. 76, c./.). 



The posterior end of the vagina is eversible as a very short 

 ovipositor (PI. XVI, fig. 15, f.d.). This structure is bounded 

 on each side by two short lobes constituting a kind of 

 sheath comparable to the lateral lobes of the male (?•. I. Land 

 I. I. I.). A transverse section of the vagina close to the 

 external opening and showing the folded nature of the wall 

 and the muscular coat is given in PL XX, fig. 78. 



The posterior end of the vagina is provided with a pair of 

 lai"ge clusters of glandular cells forming accessory sexual 

 glands (PI. XX, fig. 75, gl. c). As already described, the 

 cells of a portion of these glands discharge into the ventral 

 recess between sternites IX and X (fig. 79). 



The secretion (sec.) of the gland is seen both in the recess 

 and in the lumen of the vagina (fig. 80). Possibly it is odori- 

 ferous and serves for sexual recognition. A similar gland is 

 not found in the male. 



There is no clearly defined bursa copulatrix. 



The spermatheca is a somewhat elongated curved tube 

 (PI. XX, fig. 75, spt.), and is situated rather far forward in 

 the 8th abdominal segment (PI. XVIII). It arises in con- 

 nection with a large bilobed spermathecal gland, placed on 

 the right side of the body, and runs to the middle line 

 dorsal to the vagina and ventral to (above) the colon. The 

 spermatheca is lined by a cuticle which is very conspicuously 

 striated like a trachea. Although very carefully looked for 

 in three series of sections, a spermathecal duct (indicated by 

 dotted lines in fig. 75) from the vagina could not be discovered. 

 In all three cases the spermatheca was filled with semen, and 



YOL. 4, PART 2. 23 



