Problem with interfacing MicroSD with Arduino Mega

Hello every body

I am trying to interface the MicroSD with Arduino Mega but I could not figure out the new SPI pins for the MicroSD library. I found out that the SPI pins for the mega are
SPI: 50 (MISO), 51 (MOSI), 52 (SCK), 53 (SS).
In the MicroSD library, I found this definations :

// see header for credits

#include "mmc.h"


// PORTB pin numbers
//
// arduino D10
#define SS    2

// arduino D11
#define MOSI  3

// arduino D12
#define MISO  4

// arduino D13
#define SCK    5

However, I could not figure out what the numbers 2,3,4 and 5 mean.
The board that I am using is microSD module for Arduino
Could anyone help me with that.

They are the PIN registers for PORTB. They correspond to the nunbers in the comments. See Arduino Reference - Arduino Reference

So what are the new Port number for Arduino Mega in this case?