Yes, I remember those from a while back. In those the arrows are showing the direction of current-flow. You'll notice the similarity to the JFETs. Also, similar to NPN/PNP bipolar symbols.Nowadays, the arrows are used to illustrate the type of substrate, eg, arrow points inward[ala "cathode"] to indicate n-channel type.
Tip for remembering it: N stands for Near.NPN transistor, the arrow Not Point Near.PNP transistor? Point Near, Please!
Hmmmmm..... Seems quite strange that in these two punctures, one is a P channel and one is an N channel. I'll always have to reference a chart to figure them out! The arrows both point in, they both point from the S