230 SPOLIA ZBYLANICA. 



In Maj^ 8 oysters had an average size of 2 * 14 X 2 • 28 inches. In 

 June, 2 sjjecimens had an average of 3*25 X 3 "38 inches, and in 

 September 54 specimens averaged 3*73 X 4*02 inches. 



Area M. — There are very few oysters here owing to the presence 

 of shoal water covering the Muttikallam. 



The May measurements gave an average of 2 * 55 X 2 ' 85 inches 

 for 5 oysters. In June, 1 oyster measured 3*5 X 3*75 inches, and 

 the September average for 27 specimens was 3 '91 X 4 "19 inches. 



Area N. — An inshore area with no oysters. 



Area 0. — The oysters in this area are fau'ly abundant, and are 

 above the average size. Many of them, however, are rather under- 

 sized, and have reddish-brown stains on the shells. 



This area was examined in September only, when 136 oysters had 

 an average size of 4 '04 X 4*41 inches. 



Area P. — Oysters fairly abundant and well above the average size. 



In Ma}^, 19 specimens averaged 2*27 X 2 '46 inches. In June, 9 

 specimens measured 3 '24 X 3 '60 inches, and in September 115 

 specimens averaged 4*12 x 4 "66 inches. 



Area Q. — Oysters only present on the line bounding areas P and 

 Q, and these have been included in area P. The main part of the 

 area contains a weed which is evidently harmful to the oyster, as 

 no Placunas were found. 



Area B. — Contains few oysters, but all of good size. The oysters 

 in this area have greatly increased in growth since the ftrst inspection 

 in May, when they were only of average size. Now they are well 

 above the average. 



In May, 3 specimens averaged 2 '04 X 2*16 inches, and in June, 

 1 oyster measured 3 '5 X 4 inches. The September average, 4*43 

 X 4"94 inches, for 52 specimens, was very high. 



Area S. — Few oysters of verj^ large size are present in this area. 



In May, 1 specimen measured 2*87 X 3 "25 inches, and in June 

 a single specimen measured 3 "50 X 4 inches. In September the 

 average of 12 specimens was very high, viz., 4*52 X 5 '08 inches. 



Area T. — Areas R, S, and T resemble each other in having 

 extremely large oysters, Avhich however are not very abundant. 

 500 oysters were placed here in June from area J. 



In September the oysters in area T had an average size of 4 '38 

 X 4*87 inches for 13 specimens. 



Areas U, V, and W. — No oysters. 



The nearer we approach to the south-western shore of the lake 

 the deposit of mud increases in thickness. This is doubtless due to 

 the large deposition of mud, which is brought doAvn by the various 

 rivers which open into this part. In this portion of the lake the 

 tide is evidently not very strong. Hence the mud does not get 

 sufficiently scattered, but forms a thick deposit opposite the mouths 

 of the rivers. This will account for the absence of oysters in areas 

 U, V, and W. 



