Letter, 23/10/1906, Hubert Lyman Clark, Museum of Comparative Zoology, Cambridge, Mass.,U.S. A. to Professor W B Benham, Reports that the Museum of Comparative Zoology would like to enter into an exchange of Echinoderms with Otago Museum. Notes that New Zealand and Western Pacific Echinoderms are of particular interest to the Museum of Comparative Zoology. Encloses booklet listing the Echinoderms available for exchange.