Octanum

Hi, car noob here, and I was wondering if anyone could identify the part in these pictures for me? I've put a red box around the part that is broken, but not sure what it's called. Basically, I can tell that half of the part that's supposed to be the thread for the bolt just snapped off, and that's what you can see in the pictures. Also looks like something is leaking, but not positive. The car is a 2007 Civic.

Closeup:
https://i.imgur.com/H8ICjfM.jpg

Slightly Farther:
https://i.imgur.com/vbMYUxt.jpg

m_shake

The part that's broken is the transmission casing, and it's def leaking.

Octanum

Thanks!