670 Proceedings of the Royal Irish Academy. 



Copepoda — a laborious undertaking, especially as the Copepoda usually 

 formed the chief bulk of the tow-nettings (page 737). 



Mr. J. T. Cunningham has written a report upon the few larval 

 fishes taken dui'ing my first visit in 1895 (page 752). 



Mr. F. "W. Gramble has identified the various ChaBtognatha(p.745). 



The four reports mentioned above are treated as separate publica- 

 tions, each complete in itself ; and I have added one on the Medusae, 

 on account of its disproportionate length. The remaining pelagic 

 animals belonging to various groups, for the identification of which I 

 am mainly responsible, are placed together in this part under Paunistic 

 I^otes (page 676). 



Valencia Harbour, and its Surroundings. 

 (See Chaet I., p. 671, and Chart II., p. 754.) 



The harbour occupies the unique position of being the most westerly 

 port in Europe, the lighthouse at its entrance standing in longitude 

 10° 19' 16" W., and latitude 51° 56' 0" N. It is situated at the 

 northern end of Yalencia Island, which is separated fi-om the mainland 

 by a naiTow channel like a tidal river in general appearance. This 

 channel, with 1 to 4 fms. of water at low tide, is about six miles in 

 length, extending from Yalencia Harboiu' to Port Magee, situated at 

 its southern entrance. The tide does not enter at one end of the 

 channel and pass out at the other, but comes in at both ends : the 

 two tides meeting in the channel about midway, so that the action of 

 the tide in Yalencia Harbour is just like that in a tidal river. 



Most of the tow-nettings were taken in Yalencia Harbour Channel, 

 between the lighthouse at the entrance and the feny pier at Knights- 

 town. This channel is about two miles in length, 5-7 fms. deep at 

 low water, and does not exceed half a mile in width. It has a nan'ow 

 enti'ance from the ocean, facing the north-west, and not quite a quarter 

 mile across. A little way inside is an isolated reef of rocks lying in 

 mid-channel, and just uncovered at low tide, round which the tide 

 flows at a good pace. In this locality the tide is strong enough to 

 keep afloat and to extend fully a large tow-net fastened to a boat at 

 anchor, the ideal method of tow-netting. The flow of the flood-tide 

 is marked one and a half knots on the Admiralty Chart, and the ebb- 

 tide two knots. The narrow entrance with the rocky reef just inside, 

 followed by a cui'ving of the channel to eastwards, affords an excellent 



