CEYLON PEARL OYSTER REPORT 



C PEP DA, PLATE XX . 



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Figs. 1~5, Doropomtius denticornis. 

 !)-18, Cletoponthjs serratus. 



Figs, 6-8, Para-lichomolgtjs longicaudatus . 

 Figs. 19-31, Stephopontius typicus . 



