MARINE BIOLOGICAL STATION AT PORT ERIN. 109 



The sea-crayfish or Norway Lobster (Nephrops nor- 

 vegicus), though differing in size, shape and colour, is 



Fig. XVII. — Young Lobster or " Lobstorling " stage, after the fourth 

 casting (magnified 5 times ) 



a near relative of the common lobster. It occurs in large 

 numbers at moderate depths in the Irish sea, and is 



