On page 337, the third and fifth legends in Figure 2 should read Laminaria saccharina , Polymastia arctica , respectively. On page 339, the first column of Table 1 row 6 should read Ahnfeltia plicata row 7 should read Corallina sp. row 8 should read Lithothamnion sp. row 19 should read Pigospio elegans row 26 should read Hiatella arctica row 27 should read Mytilus edulis row 30 should read Margarites groenlandicus row 36 should read Asterias rubens row 40 should read Molgula sp. In the second column of Table 1 row 6 should read Rhodophyta row 40 should read Ascidiacea On page 340, the first column of Table 2 row 4 should read Polysiphonia nigrescens row 5 should read Rhodophyta gen. sp. row 6 should read Rhodophyllus sp. row 15 should read Leucosolenia complicata row 18 should read Lucernaria quadricornis row 24 should read Shizoporella limbata row 27 should read Hiatella arctica row 29 should read Nicania montagui row 30 should read Margarites groenlandicus row 31 should read Testudinalia tesselata row 38 should read Ophiura robusta In the second column of Table 2 row 2 should read Rhodophyta row 39 should read Ascidiacea ERRATA