POLYCH.KTA OF rLYMOUTH. 593 



Monograph, and of important papers on Irish Polychsetes by Mr. R. 

 Southern. The character of the various dredging and trawling grounds 

 in the Plymouth neighbourhood is fully described in the general account 

 of the Plymouth Fauna {Journ. Mar. Biol. Assoc, vol. vii., 1904, p. 159), 

 where a chart of the area will also be found. Similar accounts of the 

 Salcombe and Exmouth areas will be found in the respective reports. 



The following list of the Plymouth grounds, with depth and general 

 nature of the bottom, etc., may be useful for reference. 



LIST OF PLYMOUTH COLLECTING! GROUNDS. 



Shore. 



Rum Bay. This term is used to include the shore from Batten 

 Breakwater to Jennycliff Bay. Shale rocks, with patches of gravel and 

 sand. Some stony ground. 



Drake's Island. Stony and rocky shore. Some patches of sand 

 and a zostera-hed. 



Mount Edg"cumbe. At the mouth of the Hamoaze. Very similar 

 to the rocky and stony ground on Drake's Island. 



Rocks below Laboratory. Rocks of hard Plymouth limestone, 

 with good rock-pools. 



Dredging Gromids of Plymouth Sound. 



Millbay Channel. 14-23 fms. Stones and mud. Free from growth 

 of seaweeds. 



Asia Shoal. 5-7 fms. Stony ground with some growth of red sea- 

 weeds. 



Queen's Ground. 5-6 fms. The term is used to include the area 

 from Queen's Ground Buoy to New Grounds Buoy and the ground 

 around the latter, all situated at the western entrance to Plymouth 

 Sound. The soil is shell gravel, with stones and shells. It is very free 

 from mud and there is some growth of red seaweeds. 



Duke Rock. 4-5 fms. Near the eastern entrance to Plymouth 

 Sound. The bottom is rocky, with intervals of ground occupied by 

 stones and shells. 



The Cattewater. The inner Plymouth harbour, where the bottom is 

 soft mud,. which can be worked with a shrimp trawl. The trawlers often 

 throw their refuse overboard here, and many of the outside species can 

 survive for a time. 



