38 Praeger — Fossils at Alexandra Dock, Belfast. 



Helix nemoralls, Mull. 



Two specimens of this land shell occurred in the top clays. 

 Patella vulgata, Linn. 



Yellow sand, very rare, and much worn. (One specimen, Grainger). 



* Helcion pellucidum, Linn. 



Several young specimens in the upper clay. 

 Flssurella Grseca, Linn. 



Very rare ; a single specimen in the yellow sand. 



* Capulus Hungarieus, Linn. 



Upper clay, one specimen. 

 Trochus magus, Linn. 



In the yellow sand and upper clay, very rare. 

 Trochus clnerareus, Linn. 



Very frequent, except in the lower clay, where it did not occur, 

 f Trochus umbilicatus, Mont. 



Upper clay, rare, and of small size. 

 lacuna divaricata, Fabr. 



Very frequent, especially in the upper clay. 

 Xiittorlna obtusata, Linn. 



Frequent throughout. 

 Xiittorlna obtusata, var. aestuarll, Jeff. 



Two examples in the upper clay. 

 Xiittorlna rudls, Maton. 



Frequent in the upper and lower clays. (Scarce, Stewart). 

 Xiittorlna rudls, var. tenebrosa, Mont. 



Upper clay, one specimen. 

 Xiittorlna Utorea, Linn. 



Common throughout the deposits. 

 Rlssoa lnconspicua, Aid. 



Common, and generally distributed. Now quite extinct in our lough. 

 Rlssoa membranacea, Adams. 



With the last species. 

 Rlssoa vlolacea, JJesm. 



Very frequent in the upper and lower clay, 

 f Rlssoa striata, Adams. 



In the upper clay, not uncommon. 

 Rlssoa vltrea, Mont. 



With the last, but rare. 

 Hydrobla ulvae, Penn. 



Occurs throughout the deposits ; in abundance in the most recently formed 



bed. 



