MARINE BIOLOGICAL STATION AT PORT ERIN. 75 



The diagram of sea and air temperatures for 1913, compiled 

 by Mr. Chadwick from his daily records, is not yet completed ; 

 but those for the two preceding years, 1911 and 1912, are 

 inserted here to show the general similarity of the two curves 

 along with a few points of divergence, and to demonstrate again 

 the manner in which the temperature of the sea lags behind 

 that of the air in both winter and summer. 



Judging from the time of appearance and the maxima of 

 most of the plankton groups, 1912 was an unusually early year. 

 The Diatoms made their appearance in quantity earlier, and the 

 maxima of the Dinonagellates and the Copepods were about a 

 month earlier than in 1911. Although 1911 had an unusually 

 hot and dry summer, it was not until late in April that the 

 temperature of the sea rose above 45° F., while in 1912 the sea- 

 temperature was 45° or over from the end of February onwards. 



The annexed charts show the contrast between the two 

 years very clearly. 



L.M.B.C. Memoirs. 



Since our last report was published, Memoir XXI on 

 Eupagurus, the Hermit Crab, by Mr. H. G. Jackson, M.Sc., 

 has been issued to the public. Miss E. L. Gleave, M.Sc, has 

 nearly completed her Memoir on Doris, the Sea-lemon ; 

 Mr. Chadwick is engaged on a Memoir on the Echinoderm 

 Larvae of Port Erin ; and still others are in preparation. 



The following shows a list of the Memoirs already published 

 or arranged for : 



I. Ascidia, W. A. Herdman, 60 pp., 5 Pis. 



II. Cardium, J. Johnstone, 92 pp., 7 Pis. 



III. Echinus, H. C. Chadwick, 36 pp., 5 Pis. 



IV. Codium, R. J. H. Gibson and H. Auld, 3 Pis. 



