34 The Irish Naturalist. Jaimary, 



the northern side. The extent of sandy beach is quite 

 insignificant. A strip of some 450 yards in length exposed at 

 low water in and southward of the harbour is the only sand 

 accessible in the whole island. 



The list which follows is almost entirely the result of four 

 days' shore collecting in Easter of the year 1906, the writer 

 having received valuable assistance in this branch of the work 

 from Messrs. R. 1,1. Praeger, A. R. Nichols, and H. S. B. 

 Wollaston, while a few records were contributed by Mr. J. 

 de W. Hinch. A little dredging was done close inshore in 

 two places, off Salt-pan Ba) T in about four fathoms from the 

 dandy lugger "Shamrock," and a couple of hundred yards 

 outside the harbour mouth in about two fathoms from the 

 lugger's dingy. These dredgings were purely subsidiary to 

 the work of shore collecting, and as they added but four 

 species of mollusca to these gathered between tide-marks, 

 Ceratiso/e?i legtnnoi, Aporrhais pcs-pelecani,Tellina donaci?ia, and 

 T. squalida, it is of little importance whether they be regarded 

 as lying within or without the I^ambay territory. 



The immediate result of our four days' field work, if that 

 term may be applied to floundering amongst rock-pools and 

 seaweeds, was the discover}' of 58 conspicuous species. This 

 total, which seemed fully correspondent to the unpromising 

 nature of the shores, was raised to no less than 109 by careful 

 examination of material of various kinds carried away from 

 the island — seaweed siftings from Carrickdorrish and Talbot's 

 Bay, gravelly sand from rock-pockets both at Talbot's Bay 

 and Carnoon Bay, and shell-sand taken from the harbour, a 

 little below high-water mark. A further increment of six 

 species was contributed by Mr. Wollaston as the fruit of his 

 examination of the Nudibranchs collected by him. 



The harbour shell-sand proved exceptionally productive. 

 I have examined many scores of samples of shell-sand gathered 

 at various points along the Dublin coast, but none of them 

 approached in richness this material from Lambay harbour. 

 It yielded me 77 species of marine mollusca, of which 23 were 

 nowhere else observed in Lambay. As the final result of our 

 four successive days' collecting and of a second gathering 

 of harbour sand made bv me in Tulv last (which vielded two 

 additional species), the marine molluscan fauna of Lambay 



