After the publication in this Journal in 1899 of the paper “On the Fauna and Bottom-Deposits near the Thirty-Fathom Line from the Eddystone Grounds to Start Point” (Journ. Mar. Biol. Assoc., vol. v. pp. 365–542), observations were undertaken for the purpose of preparing a similar account of the fauna of the inshore grounds in the neighbourhood of Plymouth. As the work proceeded, however, it was realised that, owing to the great damage which has been caused to the grounds within easy reach of the harbour by the constant discharge of mud and refuse from barges working in connection with the new dockyard extension at Devonport and other harbour works, any attempt to prepare a consecutive account of the fauna and bottom-deposits over the whole area, such as was given for the grounds from Eddystone to Start, would be a matter of extreme difficulty and of little use.