34 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 95 



mating the male chelonethid attaches to the supporting surface be- 

 neath his body a filamentous spermatophore that carries a sperm- 

 containing globule at its upper end ; the globule is then taken into the 

 genital opening of the female as the body of the latter passes over it 

 during the mating performance (see Kew, 1912; ChamberHn, 1931). 

 In some of the Pedipalpida and in the Phalangida, however, an exter- 



B 



Fig. 12 



C 



GC IXS 



-Phalangida : male and female genital organs. 



A, Liobnnuni, female, diagrammatic longitudinal section of body showing 

 position of retracted external genitalia. B, Pnrccllia iUiisirans (Cyphophthalmi), 

 genital organ (from Hansen and Sorensen, 1904). C, Liobtinuiii. male, genital 

 organ protracted and genital chamber everted. 



An-, anus; Ap, apodeme; Bej, bulbus ejaculatorius; Clil, chelicera; Den, 

 ductus conjunctus ; Dct, exit duct of ovipositor; GC, genital chamber; Gld, 

 gland; Gtr, gonotreme; IXS, IXT, sternum and tergum of ninth segment; Lm, 

 labrum ; vicl, muscle ; Mth, mouth ; Ovp, ovipositor ; Pen, penis ; pinci, pro- 

 tractor muscle; rtncl, retractor muscle; VI-XJ'I, postoral somites. 



nal genital organ is developed from the walls of the genital chamber, 

 which in male phalangids, at least, undoubtedly serves to convey the 

 sperm to the female. The males of some Acarina, also, have a genital 

 tube which is said to be a true intromittent organ. 



The external genital structures of the Pedipalpida are best de- 

 veloped in the genus Tarantula, the males of which have a large 

 genital organ (fig. ii C, GO) ordinarily mostly concealed within the 



