MARINE BIOLOGICAL STATION AT PORT ERIN, 



75 



Explanation of the Plates. 



Plate I. — Chart of the Irish Sea showing the zones of 

 depth (contours 10, 20, and 50 fathoms), the nature of the 

 bottom (see p. 287), and the lines of distribution (thick 

 dotting) of the drift bottles. 



Plate II. — Calcareous "concretion," containing shells, 

 sand grains, &c, cemented with carbonate of lime and a 

 little carbonate of iron (see last report, p. 31). From a 

 photograph by Eev. T. S. Lea. 



