SEA-FISHERIES LABORATORY. 



465 



Aberdovey Mussels. 21 June, 1913. 



From near (Plate 1, No. of red colonies, 433 ; No. of white colonies, 20 

 Penhelyg J „ 2 „ „ 342 ; very numerous. 



Point. j 3 other plates with colonies equally numerous but not 



I countable owing to fusions. 



Mean No. per mussel = 19,375. 



From [Plate 1, No. of red colonies, 411 ; No. of white colonies, 22 



channel I „ 2 „ „ 400 „ „ 61 



near Pier. 3 other plates with colonies equally numerous but not 

 ( countable owing to fusions. 



Mean No. per mussel = 20,250. 



Water in Aberdovey Estuary. 21 June, 1913. 



From channel at Penhelyg Point ; 1 c.c. contained, on the average, 5 sewage 



bacteria. 

 From the channel close to the Pier ; 1 c.c. contained, on the average, 1 sewage 



organism. 



Barmouth Mussels. 19 July, 1913. 



From 



channel at 



Aberam- 



frach 

 Harbour. 



From 



channel at 



Trwyn-y- 



Gwaith. 



Plate 1, No. of red colonies, 27 ; No. of white colonies, 



„ 2 „ „ 18 „ „ 



„ 3 „ „ 75 „ „ 50 



„ 4 „ „ 22 „ „ 20 



„ 5 ,, „ 150 „ numerous 



Mean No. per mussel = 2,920. 



Plate 1, No. of red colonies, 150 

 „ 2 „ „ 150 



„ 3 „ „ 150 



„ 4 „ „ 100 



„ 5 „ „ 70 



Mean No. per mussel = 6,200. 



No. of white colonies, 10 

 ,, „ fused. 





 „ „ fused. 







Water Samples, Barmouth Estuary. 19 July, 1913. 



1. From near rocks at Aberamfrach, 1 organism per c.c. 



2. From near Railway Bridge, 1 organism per c.c. 



3. From half-way between Railway Bridge and Tnvyn-y-Gwaith, 

 1 organism per c.c. 



4. From near Trwyn-y-Gwaith, 3 organisms per c.c. 



Preston Channel Mussels. 29 Sept., 1913. 



From near / Plate 1, No. of red colonies, 550 ; No. of white colonies, 30 



No. 2 Perch I „ 2 „ „ 310 „ „ 50 



opposite -I ,, 3 ,, ' ,, 450 „ ,, 45 



Ansdell. „ 4 „ „ 400 „ „ 60 



1 „ 5 „ „ 400 „ „ 60 



Mean No. of sewarge bacteria 21,000. 



