This is the standard reference to these rare and unusual shells found (almost exclusively in) New Caledonia This book is the one that shows the gradation in these shells that determines the uncommon from the super-rare. The book first appeared in 1977 and it contains 109 pages. The shells are illustrated in color plats that are full size. The text is opposite the plates and it is in French and in English. The page size is 6.75 by 8.75 inches and it is a paperbound work.