Hi Ross: Here are bib’s form the Echinoderm publications I have. You mentioned Hawaii, my material is primarily Gulf/Florida Caribbean. There is a new Australian book coming out, but apparently it is delayed at the moment: Miskelly, Ashley 200x - Sea urchins of Australia and the Indo-Pacific, A detailed guide to all species known to occur in Australia. With detailed descriptions, and colour illustrations of live urchins and dead tests. BIB’s: is a semblance of order of usefulness. (the 1st one is great) Hendler, Gordon, John Miller, David Pawson & Porter Kier 1995 - Sea Stars, Sea urchins, and Allies: Echinoderms of Florida & the Caribbean, Smithsonian, 391 pp, 191 fig, DJ HB (L) Kier, Porter M. 1975 - The Echinoids of Carrie Bow Cay Belize, Smithsonian Contrib. to Zoology # 206, 46 pp, 12 pl, SB (L) Serafy, Donald Keith 1970 - A New Species of Clypeaster from the Gulf & Caribbean & a Key to the Species in the Tropical Northwestern Atlantic (Echinodermata: Echinoidea), Biological Results of the U of Miami Deep-Sea Exped # 58, Bull of Marine Sci Vol 20 # 3, Sept, pp 662-677, RPT, 5 pl, SB(M) Nichols, David 1962 - Echinoderms, Hutchinson Univ Lib, 20 pp, HB, DJ (M) Serafy, D. Keith 1979 - Echinoids (Echinodermata: Echinoidea), Mem. Hourglass Cruises Vol 5, Part 3, pp 1-120, SB (L) Blake, Daniel B. 1987 - Spiny Sea Dwellers: Echinoderms' Unique Features Have Helped Them Survive 100's of Mil of Yrs, Earth Science Vol 40 # 4 Winter, pp 17- 19, Jour, in full vol, SB(L) Ok, so I know sea urchins are echinoderms, not Molluscs, but its a related question. Does anyone know of a book(s) that have ID's for sea urchin tests (shells)? I know I've seen one, but unfortunately I forgot where and didn't think to write down any info on it (although I think it was a book on Hawaiian inverts, I seem to remember Heterocentrotus mammillatus being in there). I have several urchin tests, and I know you can identify species by the patterns of nodules, grooves, etc on them. Anybody know of a place I can look to help with that? Thanks! Stephen