44 Praeger — Fossils at Alexandra Dock, Belfast. 



Thracia convexa, W. Wood. 



Very characteristic of the upper clay, in which it is found in abundance. 

 Common also with Lucinopsis in the shell layer which rests on the upper 

 clay. Quite absent from the lower and top clays. 



Corbula glbba, Oliri. 



Common in the upper clay, frequent in the lower bed. 

 IK ya arenaria, Linn. 



Top clays only, where it is in great abundance. 



Mya truncata, Linn. 



Plentiful throughout the upper clay, and very large. Single valves in the 



yellow sand. 

 Pbolas Candida. Linn. 



With the two following species, this boring shell occurred only in the 



Pholad zone, between the upper and lower clay, where it was abundant. 



Pbolas crispata, Linn. 



Perfect specimens, of most unusual dimensions (see p. 31), were observed 

 all over the area of excavation, but only in the zone above-mentioned. 



* Pbolas dactylus, Linn. 



A single complete specimen in the Pholad layer. 



Teredo Tdorveglca, Speng. 



Fragments of the calcareous tubes of this species were found in the upper 

 clay. 



* Echinus sphaera, Mull. 



Spines of this large Echinoderm in the upper clay. 



Echinus mlllarls, Leske. 



This "urchin " is rather common in the clays, but is of small size. Mr. 



Stewart mentions a thickly-packed layer of the shells of this species near 



the surface of the upper clay at Spencer Basin.* 

 Amphldotus cordatus, I'enn. 



The fragile shells of this " heart-urchin " are rather common in the upper 



clay, and its spines occur in profusion. 



* Cancer pag-urus, Leach. 



Fragments of a large claw in the yellow sand. 



* Carcinus msenas, Leach. 



I twice got remains of this crab in the upper clay. 



* Portunus depurator, Leach. 



Top clays, rare. 

 Serpula trlquetra, Linn. 



Very frequent on shells all through. 



* See Footnote, page 29. 



