184 



CEYLON PEARL OYSTER REPORT. 

 List of Ceylon Holothurians continued. 



Geographical Distribution. 



An examination of the geographical distribution of the Ceylon Holothurians shows 

 clearly that they are typically Indo-Pacihc forms ; and that their recorded 

 occurrences form an etjuatorial belt, ranging from the east coast of Africa to the 

 South Pacific. 



It will be seen from the following table that only four of the 53 named species 

 have been found in the North Pacific, namely, Holothuria fusco-cinerea, Colochirus 

 armatirs, Thyone sacellus and Actinocucumis 1}ii>ioi ; while the Atlantic fauna is only 

 rejtresented by three species, which occur, two in the Caribbean Sea {Holothuria atra 

 and II. impatiens) and one at the Cape of Good Hope {Colochirus doholum). 



The table shows the recorded distribution of Ceylon Holothurians in the yreat 

 oceans of the world. The concentration in the right-hand columns, which indicate 

 the Indo-Pacific region, is most marked. 



Name of Species. 



Si/impta beselii, Jiiger 

 S. grisea, Semper . 

 S. recta, Semper. 

 iS. striata, Sluiter . 



