What happened to P1.0 to P1.15??

On the LPC2148, I am curious as to why there is a port 1, where the first 16 bits don’t exist. Is this some type of legacy naming? Like why not just call it a 16-bit port, and name them P1.0 to P1.15, instead of P1.16 to P1.31??

I am also wondering what happened to P0.24,26 and 27?

Thanks,

AH