MARINE BIOLOGICAL STATION AT POET ERIN. 287 



Mr. Alfred Leicester, of Southport, who has taken part 

 in most of the expeditions, and has collected and identified 

 the Mollusca, reports that the year's work has added fifty- 

 one fresh records to the hsts for the southern part of the 

 Isle of Man, and that of these the following nine are new 

 to our district of the Irish ^e?i: — Carclium oninimum, 

 Phil., Psammohia vespertlna, Chem., Scrobicularia nitida, 

 Mull., Chito)i marginatus, Penn., Propilicliuvi ancijloides, 

 Forh., Bissoa inconspicua, Aid., Gcecum trachea, Mont., 

 Aclis guIsoncB, Ch., and Philine angidata, Jeff. 



Finally two additions have been made to our hst of 

 local fishes, viz., Zeugopteriis unimaculatus, four specimens 

 trawled 10—12 miles west from Morecambe Bay Lightship 

 in May, depth 23 fathoms ; and Gohius pictus, Malm, 

 caught by Mr. Walker in shore pools at Colwyn Bay. 



The Submarine Deposits. 

 Turning now to the submarine deposits, the determina- 

 tion and distribution of which the Committee feel to be a 

 very important part of their work, it is still too soon to 

 attempt anything Hke a detailed account of the floor of the 

 Irish Sea, but still sufficient ' observations have perhaps 

 been made to warrant the following prehminary account. 

 The accompanying chart (Plate I.) shows the zones of 

 depths in the district, 0—10 fathoms, 10—20 fathoms, 

 20—50 fathoms, and upwards of 50 fathoms, being 

 separated from one another. At those places where the 

 Committee have obtained samples of the bottom, conven- 

 tional symbols are placed on the map* indicating, Q stones, 

 A shells, □ mud, \^\ sand, x nulhpore deposits {Melobesia 

 and Lithothamnion), and g shell concretions. The 

 chief conclusions we have arrived at so far are : — 



* One mark frequently stands for a number of different dredgmgs in the 

 same neiglibourhood. 



