130 
the castle of St. Mark, the earliest recorded building in the 
United States, 1565 A.D., which is entirely built of Coquina; 
the shells found in it appear to be chiefly those of Area 
incongrua and Ostrea virginica, both species still living in 
the Western Atlantic. 
Mr. T. S. Peace exhibited a series of curious varieties of 
Helix nemoralis, H. hortensis, and H. hyhrida. 
Dr. Alcock showed a Greenland Bullhead (Cottus Green- 
lanclicus, which was taken in November, 1872, amongst 
stones at low water on the shore of the Menai Straits. He 
stated that, so far as he knew, it is the first example met 
with on the coasts of Britain, tlie two specimens previously 
recorded, and noticed by Couch, having been captured in 
Dingle Harbour, County of Kerry, in Ireland, in the month 
of November, 1850. 
