Notes on Glacial Deposits in Ireland, 32 



Pectcn opercular Is, L.— One fragment. Present distribution, 

 north and south of Great Britain. 



P. maxitnus, L.— One fragment of a large specimen: Present 

 distribution, north and south. 



Lima subauriculata, INIont.— One beautiful and perfect valve, of 

 full size, was washed out of the material filling the spire of a Chrysodovms 

 re7r7'sus. Present distribution, north and south. 



Mytilus modiolus, I^.— Two fragments. Present distribution, 

 northern only. 



Pectunculus glycymcris, L.— Seven pieces, one of them a nearly 

 perfect well-preserved valve. Present distribution, north and south. 



Cyprlna island ica, L.— By far the most abundant fossil in the 

 deposit, but in spite of its strength, the shell is invariably broken into 

 fragments. Out of over 150 pieces collected, the largest is only if-inch 

 in length. Most of the fragments belong to fully-grown specimens ; a 

 few to )-oung shells. The fragments are in general quite angular, with 

 sharp edges. Three pieces are somewhat scratched and smoothed on 

 both sides ; two others are much scratched and polished, with sharp 

 edges; and another two are beautifully polished, with most of the edges 

 rounded. In all these pieces the markings show about equally on each 

 side ; in at least a dozen others, the smooth inner side shows scratches. 

 A few pieces are bored by Cliona. Present distribution, chief!}' northern. 



Astartc sulcata, Da C, var. eiiiptica.— Six complete valves, and 

 twenty-six fragments. This variety, which is the northern form of the 

 species, and does not now range south of Britain, alone occurred. 



A. compressa, Mont, var. striata. — Three perfect valves. Present 

 distribution, northern only. 



A; borealis, Chemn. — Twenty specimens occurred, one of them 

 being a beautifully complete and fresh valve ; several others were only 

 slightly broken. Present distribution, high northern, and not British. 



Venus casina, L. — Frequent ; thirty-six fragments were found, but 

 no complete specimen, which is certainh' remarkable, as this is one of 

 the most strongly-built of British shells. Present distribution, north 

 and south. 



Tel Una toalthica, L.— Five complete specimens, and twelve others, 

 most of them only slightly broken. One shell was bored, perhaps by a 

 Natka. Present distribution, north and south. 



Solen slllciua, L.— One fragment. It ranges north and south of 

 Britain. 



IVlya truncata, L.— Seven fragments were found. Present distri- 

 bution, chiefly northern. 



Panopaea norvegica, Speng.— Twenty-one fragments of this fine 

 shell occurred, some of them being beautifully glaciated. Its present 

 distribution is entirely northern ; in Britain it is now found on the 

 Dogger Bank only, in about 30 fathoms. 



Saxicava rugosa, L.— Four pieces. Present distribution, ever}-- 

 wliere. 



Dcntalium entalis, L.--Two broken specimens. Present distri- 

 bulion, north and south. 



Littorina rudis, Maton.~Two specimens, slightly broken, a fully- 

 grown one, and a young shell. Present range, north and south. 



Turritella terebra, L. — Sixteen broken specimens. Present dis- 

 tribution, north and south. 



Natica Alderi, Forbes.— One small complete example, which has 

 been bored through near the lip. Present distribution, north and south. 



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