234 



The Irish Naturalist. 



October, 



The third section is in the Boulder-clay of the Edmondstown 

 River near Rockbrook. This section, which is 400 feet above 

 sea-level, was pointed out to me by Mr. I^amplugh of the 

 Geological Survey. The shells were dug out of a stiff Boulder- 

 clay, and though Jjroken were v^xy fresh in appearance, with 

 sharp angles and sculpture, some retaining their original 

 glaze. The following species were obtained : — 



Venus sp. 

 Tellina sp. 

 Psammobia sp. (?) 

 Saxicava rugosa, Linn. 

 Mya arenaria, Linn. 



Turritella terebra, Ltnn, 



LAMEUvIBRANCHIATA : 



Nuculana (Leda) pernula, O. /■'. Mul/er. 

 Cardium echinatum, Liun. (?) 

 Cyprina islandica, Linn. 

 Astarte borealis, Chc/n. 

 A. compressa, Mont. 

 A. sulcata, Da Costa. 



Gastropoda : 



Dentalium entalis, Linn. (J) 



AnnEUDA : 

 Serpula, sp. 



CiRRIPEDIA: 



Balanus Hameri, Ascanins. 



Of the above, Astatic borealis and Lcda pernula have at the 

 present day an arctic range. 



The last section to be described is in the Boulder-clay of the 

 same stream, just south of Rathfaniham, 150 feet above sea 

 level. The shells were in the same fresh state as at Rock- 

 brook, the fragment oi Astarte bo) calls retaining the original 

 brownish epidermis. The following species were collected : — 



LAMEIvIylBRANCHIATA : 

 Pecten opercularis, Linn. 

 Nuculana (Leda) perniula, 0. F. 



Muller. 

 Cardium echinatum, Linn. (?) 



C3'prina islandica, Linn. 

 Astarte borealis, C/iem. 

 A. sulcata, Da Costa. 

 Artemis sp. 



Gastropoda : 



Turritella terebra, Linn 



Pleurotoma turricula, Brocchi, 



The officers of the Geological Survey engaged in mapping 

 the drift of Co. Dublin discovered a shell-bearing gravel 

 deposit on the northern bank of the River Liffey, beside the 

 ferry, opposite Palmerstown. This section is of great import- 

 ance, as it is the most inland section recorded up to the 



