LIST OF THE BRITISH MARINE INVERTEBRATE FAUNA. 217 



Interim Rejwii on the Gauging of Water by Triangular Notches. 



2 Donegal Square West, Belfast, 

 23rd June, 1860. 



Dear Sir, — With reference to the experiments on the gauging of water 

 by its flow in triangular notches, authorized by the General Committee at 

 Abeideen, I have to report, for the information of the Association, that, as 

 they have to be carried on in the open air in a field adjacent to a waterfall 

 at several miles distance from home, and as they require the formation of 

 ponds and the construction of measuring tanks, sluices, &c, and involve 

 careful and repeated observations continued often through whole days, fine 

 summer weather free from both rain and wind is almost quite essential, and 

 winter weather is peculiarly unsuitable. For these reasons, and on account 

 of my duties at Queen's College here, I could not enter on the construction 

 of the experimental works until the close of the College Session, which 

 occurred only on the 9th inst. I have now, however, got the principal parts 

 of the works constructed, and have got preliminary trials made, but I have 

 found it impossible to have the final experiments ready for the very early 

 Meeting of the Association which occurs in the present year. For these 

 experiments a grant of £10 was placed at my disposal ; and in order to meet 

 the costs already incurred, of which some, from the nature of the case, are at 

 present uncertain, I now apply to the Treasurer for the whole amount of the 

 grant, for which I shall account at next year's Meeting, giving at that meet- 

 ing my report on the experiments now in progress. 



I am, dear Sir, yours faithfully, 



James Thomson. 

 To John Phillips, Esq., LL.D., F.B.S., 

 Assistant General Secretary, British Association. 



List of the British Marine Invertebrate Fauna. 



[For the Dredging Committee of the British Association.] 



NOTICE. 



The following lists have been prepared in conformity with the desire of the 

 Committee of the Natural History Section of the British Association for the 

 Advancement of Science, which, at my suggestion, recommended the appoint- 

 ment of a general Dredging Committee, with a liberal grant of money for 

 the carrying out of its objects. 



It is intended to place these lists in the hands of the local Dredging Com- 

 mittees and naturalists engaged in researches in the most important districts 

 of the coasts of Great Britain and Ireland, with a request that they may be 

 returned, with notes on the conditions under which each species of the par- 

 ticular district has been found, and memoranda of such additional species as 

 may be obtained. By this means it is hoped to collect local lists of great 

 interest, and materials for a more complete catalogue of the Invertebrate 

 Fauna of the British Seas. In the preparation of the present lists, I have 

 been assisted by Dr. Baird and Mr. S. Woodward and other members of the 

 Dredging Committee. The catalogue of Mollusca is taken from the work 

 of Messrs. Forbes and Hanley ; that of Crustacea has been obligingly fur- 

 nished by Mr. Spcnce Bate; of Radiata by Mr. Stuart, of the Koyaf College 



