[No abstract given, the work begins as follows] During a recent visit to Eden, Dr. J. O. Cox obtained a Holothurian, which he presented to the Museum collection. The species proves to be Stichopus mollis, Hutton, hitherto only recorded from New Zealand. At first I referred it to S. sordidus, Thëel, but on consulting a paper by Prof. A. Dendy since received, I find that the "Challenger" specimens are considered to be examples of Hutton's Holothuria mollis. I agree with the opinion as expressed by Prof. Dendy. There appears to be no character to distinguish them except that of colour, which is evidently variable.