Smithsonian miscellaneous collections . appendages. Most of the Arachnida do not have an organ for intromission ofthe sperm associated directly with the gonotreme. The mating habitsof the arachnids are well known only in a few groups, but generallyif the male personally inserts the spermatozoa or spermatophores intothe sperm receptacle of the female, he uses for this purpose a pair ofthe body appendages, such as the chelicerae in the Solpugida, or thepedipalps in the Araneida. The female, however, may be inseminatedin some indirect manner, as with the Chelonethida. At the time of 34 SMITHSONIA
Smithsonian miscellaneous collections . appendages. Most of the Arachnida do not have an organ for intromission ofthe sperm associated directly with the gonotreme. The mating habitsof the arachnids are well known only in a few groups, but generallyif the male personally inserts the spermatozoa or spermatophores intothe sperm receptacle of the female, he uses for this purpose a pair ofthe body appendages, such as the chelicerae in the Solpugida, or thepedipalps in the Araneida. The female, however, may be inseminatedin some indirect manner, as with the Chelonethida. At the time of 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 thegenital opening of the female as the body of the latter passes over itduring 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 showingposition of retracted external genitalia. B, Pnrccllia iUiisirans (Cyphophthalmi),genital organ (from Hansen and Sorensen, 1904). C, Liobtinuiii. male, genitalorgan 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-XJI, postoral somites. nal genital organ is developed from the walls of the genital chamber,which in male phalangids, at least, undoubtedly serves to convey thesperm to the female. The males of some Acarina, also, have a genitaltube which is said to be a true intromittent organ. Th
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