generic 'catalog' singleton

Catalog.cs

    public interface ICatalogEntry
    {
        string GetName();
    }

    public class Catalog<T> where T : ICatalogEntry
    {

        static Catalog<T> _instance = new Catalog<T>();

        Dictionary<string, T> _entries = new Dictionary<string, T>();

        public static T GetEntryByName(string name)
        {
            return _instance.GetEntry(name);
        }

        public static void Add(T toAdd)
        {
            Debug.Log("Entry " + toAdd.GetName() + " added to Catalog<" + typeof(T).Name + ">");
            _instance.AddEntry(toAdd);
        }

        public static void Clear()
        {
            _instance._entries.Clear();
        }

        void AddEntry(T toAdd)
        {
            _entries.Add(toAdd.GetName(), toAdd);
        }

        T GetEntry(string name)
        {
            if (_entries.ContainsKey(name))
            {
                return _entries[name];
            }
            else
            {
                Debug.LogError("Error: Trying to find invalid " + typeof(T).Name +": '" + name + "'");
                return default(T);
            }
        }
    }