WINDOW-PANE OYSTER. 229 



Area E. — The northerly part of this area contains the upper end 

 of the Kapalturai bed. In the hurried inspections of May and June 

 this area was not examined, but the September inspection revealed 

 the presence of numerous well-grown oysters, 8 specimens of which 

 had an average size of 4 '39 X 4 "87 inches. 



Area F. — This contains the southerly portion of the Kapalturai 

 bed, and here again the oj'^sters were well grown, and 16 specimens 

 had an average size of 4* 59 X 4*65 inches in the September 

 inspection. 



Area G. — In this area the Kapalturai bed is connected with the 

 north-western portion of the main bed. Here the oj^sters are 

 abundant, but have proved throughout the year rather below the 

 average size of the whole area. 



In May, 17 specimens had an average size of 2 • 16 X 2*32 inches. 

 In June, 1 specimen measured 3*25 X 3 "5 inches, and in September 

 61 oysters showed an average of 3 '85 X 4' 11 inches. 



Area H. — This area contains a large supph' of oysters , Avhich in the 

 early part of the year were above the average size, but which are now 

 slightly below the average size. In this area there are some of last 

 year's oysters, the remnants of the bed which was destroyed by the 

 rains of 1911. 



In May, 45 specimens showed an average of 2 '20 X 2 '39 inches. 

 In June , 2 oj^sters measured had an average of 3" 12 X 3' 25 inches, and 

 the September average of 100 specimens was 3*78 X 3 '99 niches. 



Area J. — This area receives the water from the Sembian-aar and 

 the Polokarai-aru , and it maj^ be looked upon as a point of danger in 

 the lake, as in the event of excessive floods these oysters will pro- 

 bably be the first to succumb. Nevertheless the young oysters are 

 exceedingly abundant in this area. In May, 4 specimens showed an 

 average of 1 "96 X 2" 15 inches. In June, 237 specimens averaged 

 2 • 90 , X 3 • 21 inches, and in September 52 specimens had an average 

 size of 3 "96 X 4*28 inches. So that in spite of the proximity to 

 the rivers the j'oung oysters in this area are of good average size. 

 500 oysters were taken from here in June, 1912, and deposited 

 in area T. 1,307 oysters were transplanted from this area in 

 September to Kapalturai and Xachchikkuda, and 130 specimens were 

 transplanted to Nachchikkuda in June, but were all eaten by fish. 



Area K. — This corresponds very closely to the area J. The 

 oysters are very abundant, but very unequal in size. Dr. Willey's 

 statement that the oysters in this area are dwarfed is partly borne 

 out by the results of this year's work, but the low average rate of 

 growth is probably due to overcrowding, and not to the inherent 

 nature of the locality. 



In May, 7 specimens measured 2*57 X 2*79 inches, and in 

 September 123 specimens averaged 3*74 X 4*02 inches. 



Area L. — Here, although not so thickly disposed as in J andK, 

 the oysters are abundant and are of average size. 



