Small crack on transmission case - what should I do?

A little accident happened yesterday. I have a transmission that I was working on. It's ready to put in the car. It was on the floor and I was carrying a floor jack in my hands. When I went to put the jack on the floor next to the transmission, one of the wheels hit the transmission by accident. I noticed it made a little crack. The crack is located here:

Fortunately, it is on the bellhousing so accessing the other side is no problem. Here is a close-up of the crack:

interior:

What should I do now? A friend said just drill the ends and JB weld it. That would be an easy fix but I think it should be welded. It's not a transmission that is too common, so I would not like to have it crack more over time... Thanks!

Drill and JB weld would probably be enough I think, but welding is definitely better. Which one I would do depends how valuable the car/transmission is and if it's special or a beater.

Stop drill the ends of the crack to keep it from growing and leave it alone.

It's not in an area that needs to hold fluid in.

Welding might be overkill but why not?   At the very least Jb weld it.  I see no reason not to do that. 

I would jb weld at a minimum after drilling a hole on each end so the crack doesnt grow. Welding would be ideal tho.