1910.] ON MARINE FAUNA FROM KERIMBA ARCHIPELAGO. 167 2. Littoral Marine Fauna : Kerimba Archipelago, Portuguese East Africa. Collected by James J. Simpson, M..A., B.Sc, University of Aberdeen, September 1907 — May 1908 : Holothurioidea. By Joseph Pearson, D.Sc, F.L.S., Demonstrator and Assistant Lecturer in Zoology, University of Liverpool.* [Received November 23, 1909.] (Text-figures 13-17.) I am indebted to Mr. James Simpson for the opportunity of making an examination of the Holothurians collected by him in Portuguese East Africa. The collection consists of twenty-one species most of which do not offer any points of special interest. Cucumaria turbinala is recorded for the third time. It was first obtained by Hutton in New Zealand, who gave an unsatisfactory description of the species. Professor Herdman also obtained it from Ceylon, and a full account of the species was given by me in the report on the Ceylon Holothurians (29)t. The form described by Theel as Colochirus violaceus is represented by two specimens in the col-lection. For reasons which I shall give later, I think it necessary to establish a new genus for this species. The following is a list of the species represented in the collection : — Synapta grisea Semper. Cucumaria semperi Bel). Cucumaria turbinata Hutton. Pseadocolochirus violaceus Theel. Stichopus chloronotus Brandt. Stichoims variegatus Semper. Mulleria lecanora Jaeger. Mulleria mauritiana Quoy & Gaimard. Mulleria miliaris Quoy & Gaimard. Holothuria albiventer Semper. Holothuria atra Jaeger. Holothuria atra, var. amboinenis Theel. Holothuria curiosa Ludwig. Holothuria dojleinii Augustin. Holothuria impatiens Forskal. Holothuria lineata Ludwig. Holothuria marmorata Jaeger. Holothui'ia martensii Semper. Holothuria monacaria Lesson. Holothuria scabra Jaeger. Holothuria vagabunda Selenka. * Communicated by Prof. W. N. Parker, Ph.D., F.Z.S. f The numbers in brackets refer to the Bibliography, pp. 181 & 132.