What is this appendage?

What is this appendage?

Observation - What is this appendage?. Description: I have noticed this phallic-like appendage on several specimens of this species when I look at my photos but I cannot find any reference to it. I thought the male transferred a packet of sperm to the female's epigynum with his palps.

I have noticed this phallic-like appendage on several specimens of this species when I look at my photos but I cannot find any reference to it. I thought the male transferred a packet of sperm to the female's epigynum with his palps.