Dkscrh'tion of thk Plates. 



All tlip figures are natuial size, aud are reproduced 



from pliotog'raplis of the iiius.^cls. They represent average 



samples. 



Platk XI. 



Fig. 1. All old " blue neb " from the iirst transplanting 

 experiment at Morecambe (190-)) showing 

 the result after a period of four months in a 

 favourable area. The black portion is the 

 new shell. 



Fig. 2.- The same mussel seen from the back. The old 

 shell has been broken to show the thickness. 



Fig. •). A mussel from Heysham Skears, showing the 

 growth in seven months Avhen 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 Einghole. 

 The white line indicates the size ot the shell 

 when laid down in April, 1905. 



Plate XII. 



Fig. 5. A mussel from lieysliam Skears laid down in the 

 Einghole in April, 1904, and recovered 

 in Xovember, 1905. The white line 



indicates the original shell. 



Fig. ().- An old " blue neb " taken from the River AVyre, 

 laid down in " Staining Hole," near Hani- 

 bletoii, in April, 1905, and recovered in 

 Xovember of the same year. The black 

 portion shows the growth in the seven 

 months. 



Fig. T. — Old " blue neb " from River AVyre, 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. 



