C# OnCollisionEnter not Triggering If Statement

So, I'm using a game object with a box collider 2d for a bullet. The script below is supposed to say that if the bullet object collides with the enemy the script is attached to, then it's health is subtracted by 1, the bullet object is destroyed, and a debug message is displayed. This doesn't happen, and instead the bullet pushes the enemy and continues on it's merry way. The script for the bullet literally just says to be moving up at the angle in instantiates at, in case you wanted to know. So, why isn't the bullet corresponding to any of this script?

 using UnityEngine;
 using System.Collections;
 
 public class EnemyHealthAndDamage : MonoBehaviour
 {
 
     public float Health = 3f;
     public float maxHealth = 3f;
 
     // Use this for initialization
     void Start()
     {
 
     }
 
     // Update is called once per frame
     void Update()
     {
 
         if (Health > maxHealth)
         {
             Health = maxHealth;
         }
 
         if (Health <= 0)
         {
             Destroy(gameObject);
         }
 
     }
 
     void OncollisionEnter(Collider other)
     {
         if (other.gameObject.name == "PlayerBullet(Clone)") 
         {
             Destroy(other.gameObject);
             Health = Health - 1;
             Debug.Log("Hey it worked");
         }
     }
 
 }