Stewart — List of Estuarine Clay Fossils. 33 



Montacuta bidentata. Frequent at Belfast ; occurs in the Larne Lough 



bed in profusion. 

 Montacuta ferruginosa. In the Belfast bed, rare. 

 Lucina boeealis. Belfast bed, rare, but very large and tumid. The 



normal form occurs abundantly in the Larne Lough deposit. 

 Axinus flexuosus, Lucina flexuosa, F. & H. Abundant and luxuriant. 

 Cyamium minutum, Turtonia minuta, F. & H. Rare in the Belfast Es- 



tuarine Clay, plentiful in the similar bed at Larne Lough. 

 Cardium echinatum. Occurs in great profusion, and very fine. 

 Cardium exiguum, Cardiam pygmaurri, F '. & H. Occurs rather frequently 



in the Belfast deposit, but generally as single valves. More plentiful 



at Larne, and often complete. 

 Cardium nodosum. In the Larne Lough bed, very rare. 

 Cardium edule. Very abundant, especially in the upper and lower zones. 



Some of the shells, if not fully entitled to be considered as belonging 



to the variety rusticum, certainly approach that estuarine form very 



closely. 

 Cardium Norvegicum. Very rare. Mr. Grainger found one valve, and 



two or three valves occurred to me. 

 Cyprina Islandica. Very rare. I found one perfect specimen in the 



Thracia convexa zone of the Estuarine Clay. 



Venus lincta, Artemis lincta, F. & H. Occurs occasionally dispersed 

 through the clay, but usually in single valves. 



Venus Casina. Frequent in the Larne Lough deposit, mostly in single 



valves. 

 Venus ovata. Frequent at Larne, specimens small. 

 Venus Gallina, Venus striatula, F. & H. Diffused through the beds, form 



variable. 



Tapes aureus. Common in the Larne Estuarine bed, not rare in the 

 Belfast bed. 



Tapes aureus, var. ovata. Not uncommon, occurs both in the Larne 

 and Belfast Estuarine Clays ; attains a much greater size than the 

 typical form. 



Tapes pullastra. Frequent, especially in the lower zone. 



Tapes decussata. Shells of this littoral species occupy the lower portion 

 of the clay in great profusion. Many specimens were much above the 

 usual size. 



