sea-fisheries laboratory. 231 



Description of the Plates. 

 All the figures are natural size, and are reproduced 

 from photographs of the mussels. They represent average 

 samples. 



Plate XI. 

 Fig. 1. -An old "blue neb" from the first transplanting 

 experiment at Morecambe (1903) showing 

 the result after a period of four months in a 

 favourable area. The black portion is the 

 new shell. 



Tig. 2. — The same mussel seen from the back. The old 

 shell has been broken to show the thickness. 



Fig. 3. — A mussel from Heysham Skears, showing the 

 growth in seven months when left in its 

 original situation. The white line indicates 

 the size of the shell in April, 1905. 



Fig. 4.— A mussel from Heysham Skears showing the 

 result in seven months after removal from 

 the skears and laying down in the Binghole. 

 The white line indicates the size of the shell 

 when laid down in April, 1905. 



Plate XII. 



Fig. 5.— A mussel from Heysham Skears laid down in the 

 Ringhole in April, 1904, and recovered 

 in November, 1905. The white line 

 indicates the original shell. 



Fig. (I. An old " blue neb " taken from the Hiver Wyre, 

 laid down in " Staining Hole," near Ham- 

 bleton, in April, 1905, and recovered in 

 November of the same year. The black 

 portion shows the growth in the seven 

 months. 



Fig. T. — Old " blue neb " from River Wyre, laid down in 

 " Staining Hole" in April, 1904, and 

 recovered in November, 1905. The black 

 portion is the new growth that has been 

 added in a period of nineteen months. 



Plate XIII. 

 Chart showing the mussel beds at Morecambe. 



