1910.] ON MARINE FAUNA FROM MKRGUI ARCHIPELAGO. 183 



3. Marine Fauna : Mergui Archipelago, Lower Burma. 

 Collected by Jas. J. Simpson, M.A., B.Sc, and R. N. 

 Rudmose - Brown, B.Sc, University o£ Aberdeen, 

 February 1907 — May 1907 : Holothurioidea. By 

 Joseph Pearson, D.Sc, F.L.S., Demonstrator and 

 Assistant Lecturer in Zoology, University of Liverpool *. 



[Received November 23, 1909.] 

 (Text-figures 18-21.) 



Owing to the kindness of Mr. Simpson, I have had an oppor- 

 tunity of examining the collection of Holothurians obtained by 

 him and Mr. Rudmose-Brown from the Mergui Archipelago. 

 This collection, which comprises fourteen species, is typical of the 

 Indian Ocean. There are no new species to record, and I have 

 noted no points of special interest with the exception of the 

 occurrence of Thyone fusus var. papuensis. This form, which 

 differs only from Thyone fusus in the large size of the calcareous 

 ring, is interesting because of its distribution. The latter species 

 is distinctly northern in its distribution and occurs in the 

 cold waters of N.W. Europe. The variety papuensis has been 

 obtained only from tropical seas, once by the ' Challenger ' in the 

 Torres Straits, twice by Prof. Herdman off Ceylon, and it is also 

 represented in the present collection. 



The following is a list of species in the collection : 



Cucumaria imbricata Semper. 

 Cucumaria semperi Bell. 

 Colochirus inomatus von Marenzeller. 

 Colochincs cucumis Semper. 

 Thyone fusus, var. papuensis Theel. 

 Thyone sacellus Selenka. 

 Actinocucumis typiea Ludwig. 

 Phyllophorus cebuensis Semper. 

 Miilleria echinites Jaeger. 

 Holothuria curiosa Ludwig. 

 Holothuria vmpatiens Forskal. 

 Holothuria oeellata Jaeger. 

 Holothuria princeps Selenka . 

 Holothuria scabra Jaeger. 



List of Stations at which Holothurians were obtained. 



Station I. East of Tavoy Is. and Port Owen. 

 Bottom. Sand, broken shell, and mud. 

 Depth. 4-12 fathoms. 

 Holothuria curiosa. 



* Communicated by Prof. W. N. Pakkee, Ph.D., F.Z.S. 



