84 LIVERPOOL BIOLOGICAL SOCIETY. 
Actinocrinus stems. 
*Palechinus. 
Orthis resupinata, Mart. 
Productus semireticulatus, Mart. 
punctatus, Mart. 
i latissimus, Sow. 
*Nucula (Ctenodonta) tumida, Phil. (gibbosa, Flem.) 
~ *Sanguinolites clavus, M‘Coy. 
*Asymptoceros (Nautilus) dorsalis, Phil. 
99 
Succeeding the Carboniferous limestone, there is a great 
gap in the geological record of the history of Puffin Island, 
as the only other period represented is the glacial. 
Evidence of glacial action may be divided into four 
classes—external configuration, the presence of erratics, 
of boulder clay, and of glacial strie. Of these, boulder 
clay is absent from Puffin Island, and the evidence 
afforded by the strie and the form of the island is not 
conclusive, so that the erratics, or boulders of rocks foreign 
to the district, lying scattered over the surface form the 
strongest argument for glacial conditions. Two of the 
erratics have been deposited in the laboratory, the larger 
and better striated of which was identified by Professor 
Carvill Lewis as a block of Lake district felsite; many 
small fragments may be collected at the mouths of the 
rabbit burrows. Mr. J. G. Goodchild, F.G.S., of the 
Geological Survey, has kindly examined my collection, 
and has been able to identify the following :— 
Hard Chalk of Antrim. 
Flints, from Antrim. 
Carboniferous Chert. 
-Ironstone concretion. 
* The species marked with an asterisk are not given in Morton’s or 
Etheridge’s lists, and apparently have not been recorded before from this 
district. 
