No that is not his scrotum. It's a incubation sac the male hangmen gestate the baby not the women..the women basically envelope the gestational sac with her ..vagina and secrets a solution which seeps into the sac and fertilizes the seeds. Then the male devours the female for nutrients and carries the clutch usually up to 7 for 4 months until they burst out. At which time they consume the incubation sac and the father if the father cannot find adequate food for the young.
I always tend to have a little background story for everything I draw in my head but finally decided to type it out. Thanks a lot Brendan. As always a loyal follower of my work as I am yours.