58 



ME. STANLEY SMITH OX 



[March. 1913, 



Note on Peterhill Quarry, Bathgate (Linlithgowshire). 



Peterhill Quarry, now converted into a reservoir, has provided a 

 great part of my material ; although this limited collecting-ground 

 only consists of an exposure extending for a few yards along the 

 side of the water, the corals lie thickly crowded together in a 

 calcareous hed 2 feet thick, and are also plentiful throughout 

 the few feet of shale that separate it from the thicker encrinital 

 limestone helow. Dibunophyllids and large Zaphrentids are 

 plentiful, but in numbers AulopTiyllum far exceeds the other 

 simple forms. The corals are remarkable for their fine state of 

 preservation, and for the very wide range of variations represented 

 in AulopTiyllum. Further interest and importance are attached to 

 the exposure, on account of Thomson having collected here a large 

 number of the forms figured in his paper on AulopTiyllum and 

 Oyclophyllum. 



IV. General Description of the Genus. 

 (1) External characters. — AulopTiyllum may attain a con- 

 siderable size and 



Fig. 1.— Aulophyllum 



nat. sizt 



[The specimens are preserved in the Museum of Practica 

 Geology, Jermyn Street. London. A is No. 25434 

 from Chapel, near Kirkcaldy (Fifeshire) ; B is 

 No. 26255 from Peterhill Quarry, Bathgate.] 



length, and in cer- 

 tain localities, and 

 even in particular 

 quarries, large 

 specimens are es- 

 pecially abundant. 

 The largest that 

 I have obtained 

 came from Triflach- 

 Wood Quarry near 

 Llanymynech ; it 

 was 40 cms. long, 

 and had a maxi- 

 mum diameter of 

 4 centimetres. 



The corallum, in 

 the young state, is 

 cornute, but later 

 it becomes cylin- 

 drical. The shape- 

 is, however, often 

 modified by irregu- 

 larities of growth 

 and rejuvenes- 

 cence. Increase 

 in diameter gen- 

 erally progresses 

 with comparative 

 rapidity in pro- 

 portion to growth 

 in length : hence 



