1922] 



MADRAS PEARL FISHERIES 



161 



Dorsal aspect 



Posterior 

 aspect 



Hinge 



\T ~ ~ i 



Byssus 



Anterior 

 aspect 



Ventral margin 



Diagram to explain the chief terms used in describing the shell of the pearl-oyster. 



(4) The comparative abundance of the following animals 

 should be noted, so far as it is possible to ascertain the facts : — 



(<•<-) Chanks (with a view to utilizing this knowledge in 



further exploiting the chank fishery). 

 (/>) Starfishes (especially the scarlet-lake coloured Pentaceros 



lincki, a great enemy of the pearl-oyster). 



(c) Rockfishes and Trigger-fishes (Vellamin and Kilati). 



(d) Suran {Modiola barbata). 



{e) False-spat {Avicula vexillum). 



The abundance of sea-weed should also be recorded. 



Charting the results. — Each of the four inspection Coxswains 



should fill up, each day that circle inspection be employed, a 



simple diagram provided with three concentric circles, while the 



Inspector should the same clay transfer to a master-form 



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