248 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



Cceciun glahi^win, Mont. — Scarce, 

 Turritella terebra, Linn. — Rare. 

 Scalaria communis, Lam. — Rare. 



Turtonce, Turt. — Rare. 

 Eulima sp. — Rare; worn specimens. 

 Natica sordida, Phil. — Rare. 



catena. Da Costa. — Common. 



Alderi, Forbes. — Common. 

 Velutina Icevigata, Penn. — Scarce. 

 Aporrhais Pes-pelecani, Linn. — Rare. 

 Cerithium reticulatum,, Da Costa. — Frequent. 

 Purpura lapillus, Linn. — Scarce ; common enougli 



on the rocks north and south 

 of this area. 

 Buccinum undatum, Linn. — Large variety common. 

 Fusus antiquus, Linn. — Rare ; empty. 



gracilis. Da Costa. — Rare. 

 Nassa reticulata, Linn. — Frequent. 

 Cyprcea eiiropcea, Mont. — Rare. 

 Utriculus ohfusus, Mont. — Frequent. 



truncatulus, Brug. — Frequent. 

 Actceon tornatilis, Linn.— Scarce. 

 Scaphander lignarius, Linn. — Frequent. 

 Sepia officinalis, Linn. — Rare ; internal bone only. 



Note. — Since writing the above, I have learned from the 

 fishermen and others that at a distance of about a mile from 

 the mouth of the Irvine Water the bed of the Firth suddenly 

 deepens from about six to thirteen fathoms. This submarine 

 cliff runs towards Troon, on the one hand, and in the direction 

 of the west end of Stevenston, on the other. Since this agrees 

 exactly with the direction of the " Capencraig Gaw," or trap- 

 dyke which passes in a north-west and south-east direction near 

 the west end of the town of Stevenston, I have no doubt that 

 the sudden alteration in the depth of the sea-bed takes place 

 against the side of this dyke ; and it is not unlikely that at one 

 time, when the land stood higher than at present, a line of 

 shore cliffs stretched along for some distance at this part, the 

 top of which is now only seen during low water at the Lappock 

 Rock. This sudden break in the continuity of the sea-bed will 

 no doubt have some influence on the shells that are washed 

 p,shore on this beach. — J. S. 



