VI 



ARACHNOIDE A SEXUAL ORGANS 



533 



through an unpaired ventral genital aperture at the anterior end of 

 the abdomen. Several organs, chiefly accessory, are connected with 

 the terminal portion of the ducts, viz. receptacula seminis, vesiculse 

 seminales, glands, male and female copulatory organs. The anatomical 

 structure of the sexual apparatus in the different Arachnoidea varies 

 greatly in detail. The review which follows is incomplete, and only 

 takes into account the better known forms. 



Scorpionidse. Female Apparatus (Fig. 375, A). Three longitudinal tubes, beset 

 with spherical ovarian follicles, lie in the pre-abdomen, one median and two lateral. 

 The median tube is connected with the lateral by 5 transverse anastomoses, also beset 



FIG. 375. Female sexual apparatus of various Arachnoidea. Most of the figures are some- 

 what diagrammatic. A, Scorpio occitanus (after Blanchard). H, Galeodes barbarus (after L. 

 Dufour). C, Trichodactylus anonymus (Acarid) female sexual organs of the nymph (after 

 Nalepa). A An Araneid. E, Pentastoma taenioides (after R. Leuckart). F, Phalangium 

 opilio (after Gegenbauer). G. Cepheus tegeocranus (oribatid) (after Michael). H. Gamasus 

 crassipes (Acarid) (after Winkler). I, Trombidium fuliginosum (after Henking). ov, ovaries ; 

 od, oviduct ; go, genital aperture ; rs, receptaculum seminis ; or (in C), outer aperture of the same ; 

 va, vagina (in E also the uterus) ; op, ovipositor ; a, glandular appendages. 



with ovarian follicles, so that the ovigerous portion of the sexual apparatus forms 

 a network of 8 meshes. From the anterior end of this there arises on each side 

 an oviduct, which at once swells into a rather long tube (receptaculum seminis, or 

 vagina?) The two tubes converge towards the ventral middle line, where they 

 emerge on the first abdominal ring, in front of the combs, through an aperture which 

 is covered by 2 valves. The Scorpionidce are viviparous. The embryos develop in 

 the ovarial tubes, which function as uteri. 



Male Apparatus (Fig. 376, A). The tubular testes are distinctly paired. There 



