1909. CoivGAN. — Dublin Marble Biology. 167 



difficulties encountered in making up scientific crews, six 

 members of the Committee, Miss Stephens and Messrs. Adams, 

 Butler, Colgan, Nichols, and Southern were induced to take 

 part in one or other of the trips and to share in the pains and 

 pleasures of dredging. 



It seems best to arrange the notes here given into three 

 groups, one for each of the three districts worked — i.e., 

 (a.) Dalkey Sound and the Muglins ; (d.) Malahide River and 

 Creek ; (c) Skerries Bay and Islands. Four trips were made 

 in each of the first two districts and three in the third. The 

 twelfth trip, one from Bray Harbour northward towards 

 Killine}', was entirely abortive, as the heavy sea met with 

 outside the harbour made dredging from a small boat im- 

 possible. 



Dalkky Sound and the Muglins. 



April 22nd. — The year's dredgings began with a short trip 

 over this well-w^orked but by no means exhausted ground. 

 Only three effective scrapes were made, two in ten fathoms off 

 Bullock Harbour, and a third in fifteen fathoms S.E- of the 

 Battery on Dalkey Island The results were rather meagre. 

 The ten-fathom scrapes gave nothing of interest beyond the 

 following : — 



Tellina donacina, 2 valves. Psammobia telUuella, 3 living. 



T. crassa, i pair of valves united. Pectuuculus glycimeris, i valve. 



Leda miuuta, do. Eolis tricolor, i. 



Cardium fasciatuni, 3 living. Trophon truncatus, i. 



With these was one large specimen of the Pea Urchin, 

 Echinocya^nus ptisillus^ measuring §-inch in its longest diameter. 

 The fifteen fathom scrape gave one fine living specimen of 

 Pectinaria aurico?fia, 2^^ inches long. 



April 28th. — Some small sea-weeds and corallines gathered 

 this day at low water near Bullock yielded on examination a 

 single specimen each of HermcEa dendritica and Rimcina 

 HauLOckL The first named, a lively little animal J-inch long, 

 which floated freely foot upwards on the water surface while 

 in captivity, is an addition to the marine fauna of Dublin and 

 of East Ireland, the previous Irish records being all for the 

 west coast. The Runcina was a large .specimen nearl}- a 

 quarter of an inch long when in motion. 



May 2nd. — Another low-tide collection of small sea-weeds 

 made this day on the same ground as had yielded Hermcea 



