1. Extrusion of the spermatophore at the aedeagus is illustrated and an explanation advanced to account for encapsulation of the sperm masses.

2. The male genital system of Tarantula consists of paired testes, ventral glands, lateral glands, and the genital chamber with the cone like spermatophore organ.

3. Two-day-old males transfer approximately 17 000 eupyrene and 230 000 Apyrene spermatozoa to a spermatophore; approximately 5000 eupyrene and 47 000 Apyrene spermatozoa arrive at the spermatheca.

4. During sperm transfer the spermatophore remains in the interior of a membranous aedeagus with the exception of its tip, which is introduced into the orifice of the ductus receptaculi.

5. It takes about 5 min to complete the process of forming the spermatophore in the ejaculatory duct, extruding it into the spermathecal duct and ejecting it from the spermathecal duct and aedeagus following sperm transfer.